Quarter 4: Science 8 Week 4 | Work and Power | MATATAG Curriculum

0:00 Okay. So, welcome grade it. Welcome to week number four. Okay. So, this time we will talk about work and power as you can see on the screen ano. So, um, ango mga anak, alam niyo ba na this is one of the easiest topics in the fourth quarter. And for me ha, napakadali lang niyang intindihin, napakadali lang ipaliwanag. That's why I pick this topic to be um my topic in my classroom observation. kasi ang dali niya, ang dali niyang ipaintindi at ang dali niyang ituro. So anyway, I am Sir Wawi, your curious science buddy. Don't forget to like, share, and subscribe so you'll stay updated with our upcoming videos. All right, let's get started. So, like what I've said, okay, pag-uusapan natin ng work and power. Okay? Ito ba yung

0:47 trabaho at kapangyarihan? Okay, may trabaho, may kapangyarihan. Okay. So hindi yun mga anak ano. So in physics work and power has its own meaning. Okay? May deeper meaning siya sa physics. Okay? Na pwede nating ma-observe in our daytoday activities na hindi lang natin nare-realize na meron palang work doon, may power pala doon. Okay? So sige. So for our learning competency, recognize that work is done when a force causes the displacement of an object. Okay. And then second, recognize power is the rate of doing work. Actually in the learning competency pa lang, pinaliwanag na yung dalawang konsepto. At nandiyan na. Sinabi diyan work, okay, is done when force causes. Okay? Ang work daw ay

1:34 nagagawa kapag yung pwersa ay nakakalikha ng displacement or paggalaw sa isang bagay. May work. Ano? Yung power naman rate of doing work. Gaano kabilis mo natapos yung isang work? Okay? Syempre nandun yung time measurement ano. So nandun pa lang sa learning competency. Pinaliwanag yan naung na yung dalawang konsepto ano. So let's dig deeper about this concepts. So for the learning objectives, determine whether work is present or not present given some different situation. Okay. So magbibigay ako ng mga different situation and then we will try to assess whether it is work or hindi ano. So illustrate how negative work is done. Ah may negative work. Kung may negative acceleration nga may negative work din.

2:21 So analyze and solve problems related to work. So syempre dito sa topic na to we will try to solve or calculate problems related to work and of course related to power also. Ano? So demonstrate the presence of power. Paano ba? Okay. Yung power nakikita in everyday situations. So uh for the next one, calculate the power exerted through an activity. Okay? So we will try to solve problems, calculate um the amount of power exerted or that power, okay? Uh the rate of doing work, ano? So next, illustrate the relationship between work and power. Ano ba iyung relationship between the two? We will try to see ano later. So let's start. So our first task is review muna. But of course

3:08 in this review part it's a special task kasi dito pa lang wala pa tayong idea. But I will try ano I will try to ask you okay to guess. Okay parang guessing game lang muna tayo ngayon ano? So sige instructions. Observe the following situations and determine okay whether work is done or not. No work or no no work. So may babasahin akong situation and all you have to do is to tell me. Tell me if it's work or no work. May work ba doon or walang? Sige. Situation one. A student pushes the car with all their strength but the car doesn't move. Yung estudyante tinutulak yung car pero yyung car hindi gumagalaw. May work? Wala. Okay. Work or no work? Okay. Correct. It's no work ano so we will try

3:55 ano to explain it later. Next. A student leaves a book from the floor and places it on the table. Yung book galing floor binuhat. Okay. May work? Wala. Meron. It's work. Next. A student walks across the classroom carrying a backpack at a constant height. Constant height. Okay. May work? Wala. Focus tayo dooun sa backpack. Ayan. No work. Okay. So a student pulling a toy cart on the floor. Hinihila niya yung toy cart. Okay. So correct it's work. And then lastly we have a student pushes a heart against the wall but the wall doesn't aba nakipagtulakan sa sementadong wall. Okay? So may work. Wala. Hindi gumalaw

4:41 iyung work. Correct. It's no work ano. So we will try to explain this later. Babalikan natin kung bakit may work, kung bakit walang work. So let's uh try first this activity. Unlocking vocabulary work and power. Identify and match key vocabulary terms related to work and power with their correct definitions. Okay? So this one a vector quantity that is the shortest distance. Ano nga yung shortcut? The shortest distance from the initial to the final point. May initial point, may final point. It's correct displacement. Ano? Next. A push or a pool of an object? Correct. Force. Tama no? Ano nga 'yung unit ng force? Newton. Ano 'yung unit ng displacement? Meters. Ano 'yung unit ng time? Seconds. Okay. What about this one? A vector quantities that move in

5:28 the same direction. A vector quantities. Okay? Let's say magbigay tayo mga vector. Let's say force, displacement. Okay. Kapag daw same iyung direction or parallel, ayan. Pag same direction, ang tawag natin ay parallel vector. Okay? And then duration of events. Duration of events. Correct. time ano and then vectors that form a right angle let's say yung force and displacement naka-form ng right angle okay anong tawag na parallel pa din ba correct it's perpendicular vector okay so we are done on that so let's try to explain na okay so this is one of the exciting part understanding the concept of work so explain and discuss the concept of work in physics using everyday examples. Okay, babalikan natin 'yung review.

6:14 Kinalimutan niyo na ba? Hopefully hindi pa. Ano ayoko kasi sa mga madaling makalimot eh. Mm. Kasi nag-e-exert ako ng effort pero kinakalimut joke lang. Okay. So, brainstorming activity muna tayo. Work. Okay. So the question is, what comes into your mind when you hear the word work? Mga anak, ano 'yung pumapasok sa inyong isipan pag naririnig niyo 'yung work? Ito ba yung kanta no? Work, work, work, work or trabaho lang, trabaho, trabaho. Okay. So, share ideas, mga anak, ano, freely, there are no right or wrong answers. I will uh accept all your answers kung ano man yan. So baka may magsagot sa inyo, anything that makes a person sweat, may work ag pinagpapawisan. Y okay that makes a person hungry pag

6:59 nagugutom. Okay? Anything that requires effort? Nag-effort. May work na. Nag-work. May effort pero nag-work ba? Tingnan natin kung nag-work. Okay. So activities that make us start. Mm. So titignan natin ano yun ba yung work? Okay. Kaya possible answers ninyo yan. So hopefully walang sagot. Joke lang. Okay. So ano ba yung work? So connecting ideas to physics. Okay. So in physics, work has a specific meaning, mga anak, ano? So tandaan natin, not all activities, okay? Not all activities that require effort are considered work and physics. So hindi naman lahat talaga, okay? Hindi naman lahat na nag-require ka or nag-exert ka ng force is may work na. Okay? Hindi lahat ng

7:45 nag-exert ng effort nagwo-work. Okay? So joke lang. Parang iba 'yun. Okay? So hindi lahat ng may effort, may force na inapplied work 'yun. Okay? So ano ba 'yung work? So sabi diyan ng work is done when force when a force applied causes an object to move. Yung inapply mo ba na pwersa na force napagalaw mo ba yung object? Pag hindi walang work. Hindi nag-work ano. So walang work pag hindi gumalaw. kahit gaano pa kalakas 'yung persa mo ano kahit kasi lakas mo pa si Naruto. Okay? So as long as hindi gumalaw yung object walang work. Okay? So sige for work to be considered ito yung mga conditions. Fored number one, a force must be applied. Kailangan may inapply ka ng pwersa.

8:32 Unang kondisyon yun para magkaroon ng work. Pero hindi sapat yun. Nag-apply ka nga ng force pero hindi mo napagalaw. Dapat yung object must have displacement. Dapat napagalaw mo yung object. Hindi pa rin sapat sa real or sapat na? Hindi pa rin. Kailangan kung nag-apply ka ng force na paggalaw mo yung object, dapat parallel yung dalawa. The force and displacement. Tingnan natin. The force and displacement must be in the same direction parallel. Let's say you are pushing a box to the right. Tingnan mo anak yung force mo. Nag-exert ka ng force to the right. Pasaan yung box? To the right. Yun yung displacement. Parallel. Yes. Same direction yung pinupuntahan nung dalawang vector quantities. Then force and displacement. Parallel. Yes. May

9:20 work? Yes. Okay. So napakasimple 'di ba? Para masabing may work, may force. Dapat napagalaw yung object, yung force at displacement. Dapat parallel or in same direction. Nakuha? Okay. Nakuha ko sir. Sige balikan natin. Dapat ngayon hindi natin balikan to eh. Kasi ang mga binabalikan is nakakasakit lang sa atin. Pero balikan natin. Okay. So bakit ito yung work kanina? Nag-exert ka ng first day ang tinuturak. Napagalaw ba? Hindi. So wala. Ito ung student binuhat 'yung libro. Galing saan? Sa sahig. Nagapply siya ng first. Basaan 'yung force papataas alangan namang par left and right 'yung force habang nagbubuhat ka 'di ba? Alang

10:05 downward force nagbuhat 'di ba? Nung peran mo papataas pasaan 'yung direction ng bookataas. Syempre papataas din na lang ang binuhat mo 'yung book ay pababa. Okay so same direksyon dalawa. So may work yes may work. Okay, next sir. Ito naman po na gumagalaw yung estudyante kanina pero bakit noord kay sabi diyan na student ko first classroom carrying a backpack. Sabi ko sa inyo mag-focus kayo doon sa backpack. Yes. Gumagalaw yung estudyante. Okay? Gumagalaw estudyante. Pero sabi ko mag-focus tayo sa backpack. Yung displacement ng backpack papasaan yung direction? Papa-left. Hindi papataas yung backpack. Hindi papakaliwa or pa ah side or other side. pa-left yung displacement or galaw nung backpack.

10:52 Pero yung pwersang ina-apply ng shoulder doun sa backpack mapasaan at word. Okay? Pataas yung pwersa kaya hindi nalalamlog yung bag. So may work or wala? Parallel ba yung force and displacement? Hindi. Okay? Pataas yung isa. Yung isa naman ay pa okay pa left or pakaliwa rather pa-left. Okay? So iba yung direksyon ng displacement pair doon. sa direksyon ng pagkaiba walang work hindi nagwo-work kawawal okay so ito naman student pulling a toy card on the floor hinihila yung toy card may string okay paghila mo pasa ka to the right sorry na nagmamali akong kanina to the right o hinihila mo

11:37 yung toy cartan yung toy cart to the right din ba nakasunod sao yes to the right din hinihila mo yung toy cart paft paano pa-upward pa downward ay kakaiba naman nonisip ata yung card okay so pag ganyan may work yan kasi parallel same direksyon okay ito naman padalas ng pagtutulak daw ng wall makipaglaban sa wall pero ang tanong nag-exert siya ng lakasbang lakas gumalaw ba yung wall so ito ay walang work ano so clear na ba ang workout work sa inyo opo clear na poo Hopefully clear ano? Ayan so ito yung ating mga kondisyon dapat okay may pwersang

12:23 inapplied na pagalaw yung object and lastly dapat yung pwersa at yung paggalaw ng object ay parallel or same direction nakuha. Okay? Yes po sir. Nakuha na namin. Thank you po. Okay sige proceed naman tayo sa formula for work. Excited na? So to express work mathematically ito yung gagamitin nating formula. Dalawa lang naman iyung possible formula that uh we need to use okay to solve the value of work. Okay? So work is equal to first times displacement. Yan yung main formula. Pero may mga hanap may isa pa tayong formula diyan. Pag yung work naka nagkaroon or naka-form ngle may special formula tayong gagamitin. Okay? Yung work is equal to first steps displacement cosine theta. Okay? And so

13:08 ito po yung cosine theta. Yun yung angle na mag-form nung object or nung situation. Okay? Ng. Okay. So ano po yung W sir? Work. W stands for work. Flace D is displacement. And then yung theta parang zero na may half this theta basta the angle formed. Ano? So when force and displacement are parallel meron tayong 0° or 10. Yung equivalent ng angle and 0° kapag parallel. Okay, pag same direction and okay, cosine is equal to teta is 1. Okay. So ano yung unit muna? Ang unit ng work joule of course balikan natin ulit Newton. Okay? Kung ah babalikan natin ano ulit yung formula ng

13:54 force? Force is equal to masses acceleration. Okay? So dapat what if doon sa problem ang given ay hindi ano force at ang given ay mass tsaka acceleration. So kukunin niyo pa yung value ng course to the work. Okay? So dapat dito gagamit tayo ng ano din eh yung ano natin logic and then yung ating analyation skills. Okay? So identifying work in different situations. So sige practical example of work. Ito iyung may work. Saan yung direction ng force? Pushing a box sa for to the right. Direction of displacement to the right. Description of the direction of both vectors. Yung vectors na tinuturo yung pwersa tsaka yung force

14:39 tsaka displacement. Parallel ba? Yes, it's a parallel vectors. Next. Okay. So, a force is applied and the max moves in the same direction as the force. Okay. Parehas parallel. So, it's a positive work. Okay. Kasi same direction ng pinuntahan yung force in displacement. same direction parallel pero sir possible kaya magkaroon ng negative work doun sa situation natin pushing ax may negative work kaya siya yes or no correct it's a yes ang gagaling na okay may yes pa din ano pag sinabi nating negative work kapag yung pwersa let's say yung displacement pakanan t's yung pwersa pakaliwa opposit pag opposite parallel pa din parallel

15:26 Yung dalawa may work pa din pero it's a negative work. Kailan po sir nangyayari yon? Situation meron eh. Yung displacement tingnan niyo anak saan yung box to the right pero may another force pa diyan bukod sa applied force na galing sao ano ulit? Box and the floor. Anong force yun? Frictional force. Masan yung frictional force? Pakaliwa na magposisyon. So pakalwa parallel pa rin yung dalawa na frce and the displacement is parallel pero opposite yun negative nakuha. Okay? Sabi sayo ang dali dito kay at my favorite talaga. So what about this one? Lifting a book from the floor to a table. So upward iung lift coming

16:12 up yun. Direction of displacement. Nasaan yung pakanan kaliwa? Syempre pataas din. So upward direction description of the direction of both vectors parallel. Okay. An upward force causes the move of what about this one pulling a using direction of the force to the left direction of displacement to the left description of the direction of both vectors parallel. Okay. So the applied force causes the car to move forward in the direction of Okay. Next. Ito naman, no work is done. Direction of the force holding a heavy bag while standing still. Basta na hino-hold mo na hinahawakan mo yang yung mabigat daw na

16:57 bag pero ikaw ay nakatayo lang. Sinabi bang gumagalaw yung bag? Hindi. Okay. So yung applying force papataas upward pero gumagan bag? It did not move. Ano? So direct description of the vector is not applicable kasi yung isa paas yung isa naman hindi natin matug kung saan. Okay? The first or there is the first but no movement of the object. So dito naman pushing a wall that does not move. Direction of the applied force to the right direction of displacement gumala ba not move. Okay? Not applicable. So a force is applied but there is no displacement. No work is not. Okay. So, what do you call work when the first grades an angle? Kaya naman pag

17:43 naka-create ng angle, yung work. Okay, let's say pulling a suitcase using a handle. Ito yung okay, tingnan natin mga anak. Pulling a suitcase at nakahawak siya doun sa handle or handle. Pag hinihila niya yung ating subcase, yung force niya papa. Okay. Papasaan? Pakanan. Yung sucase papasaan? Pakanan din. Same 'yung direction pero yung ating handle naka-create ng angle doun sa horizontal. Okay? Naka-create siya ng so pag ganyan yung situation, ibang formula yung gagamitin natin kasi may angle. Okay? So yung aking laptop mga anak ay nalolobat na. Magpapatay na siya. Okay. In five four. O wait lang

18:33 mga anak. ch bilisan sa laptop ko manat okay excuse me ayan so may angle na na-form yung handle tsaka yung horizontal okay so dito it is still called work but more specifically it is work done by an oblique or angle force okay so work is done as long as the force has a component parallel to the displacement as long as the force and displacement Okay is parallel work pa din yun despite na naka-create siya ng angle. Okay? Kaya nga lang may special case tayo kasi ang gagamitin natin diyan na first angle case goes forward so is formula dito isung work is equal to 4 times

19:19 displacement cosθeta. So pag nagpipindot or magpipindot lang kayo ng sa calculator mga anak just ah type the value force displacement diretso. Type cosine or press cosine and then type the angle. Let's say 45° and then press equal. Okay? Ganun tuloy-tuloy. Huwag puputulin. Okay. If the first applied makes an angle of 90° from the horizontal, then work zero. Okay? Pag perpendicular or 90° yung na-form na angle, automatic na-work na doon kasi work is zero in that situation. Okay. So we're problem solving challenge. So mags-solve muna tayo ng work. So this is the formula. Kaya ano nga yung formula ng work is equal toce displacement. So using triangle method

20:06 we can derive the other formulas. Let's say force ang hahanapin pero ang given ay work at displacement. So ang gagamitin natin ay force is equal to work divided by displacement. Pag displacement naman ang hahanapin. Okay? At ang given ay work and force ay displacement is equal to work divided by force. Okay. So ano ang unit ng work? So force new displacement meter. Okay. So for sample problem number one, a pork cliff in a warehouse names 1,000 new of access 34 m from the floor. Compute the work dead by the forclip. Okay. So ano nga ulit yung ating step by step sa pags-solve? Given, required, formula, solution, and answer. Ano? So unahin muna natin yung given. Ano yung

20:52 mga given diyan? 1,000 new 34 m. Ano yung 1,000 new? That's the value of course ano iyung 34 m? That's the value of displacement. May work ba? Wala pa. Okay. So ito iyung given natin. And then the required is the work. Ano ang formula ng work? Forgas equal to force times displacement. Let's substitute the solution. Ano yung value ng force and displacement? Ano yung force? 1,000 N. Ano yung displacement? 34 m. 1,000 * 34 m is equ to 34,000. Okay. So nakuha bilis. Ang dali sir parang kahit nakapitin eh kaya kong sagot ha. Okay ano? Okay. Sample problem. Number number two.

21:38 Okay. So if 60,000 J work was done on the rock which moved 25 m, how much force was exerted? Work again. Okay. Ah ang tinatanong ay force rather force ang tinatanong 'di ba? Force na. Okay. Ang formula ng first. So ang uuna nating mga topic is forces equal to mass times sa acceleration. Pero kasi ang given diyan ay work and displacement. So hindi natin gagamitin no. So ang given natin is anong value ng 60,000 J. Ang displacement 25 m. Okay. So given yung ating work 60,000 Jung ating displacement 25 m. Required is the force. Anong formula diyan? Force is equal to work over or divided by

22:26 displacement. Substitution. Ano ang value ng work? 60,000 joule. Ano yung value ng displacement? 25 m. 60,000 jou/ 25 m is equ to 2,400. Okay? Okay mga anak, gagaling. Number three, a box is being pulled by a rope which makes a 40 angle with a horizontal. If 30 new of force was applied at the max of 12 m, how much work is that? Okay, ang tinatanong angle na dito pero work pa naman tinatanong ano. So pala yung formula. Anong ang given natin? Okay. Yung 40 angle is yun yung ating theta. The angle ano? 40°. Okay. Yung ating 30

23:12 new yun yung force. Okay. Yung ating 12 m yun yung displacement. So ung given unahin natin ang required or ang formula or is equ to 4 displacement cosine theta. So substitution anong value ng force? 13 new ano ang value ng displacement 12 m. Anong ang value ng angle? 40°. So sa pag-type sa calculator, scientific calculator, ganito. Type 30, okay, press times, type 12, okay, press cosine, type 40 and then press equal. So the answer is 275.78 nakuha. Okay. Next problem number four. A person pulls

23:58 a sled with a rope at an angle of 30° to the ground. If they exert a force of 15 new and the sled moves 10, how much work is done on the sled? So yung ating given dito mga anak merong ulit pero work pa din naman yung tinatanong. So yung ating force is 15 N. Yung ating displacement is 10 m and then yung ating angle is 30°. So given okay and then yung required natin is work. Then the formula is work is equal to first times displacement cosθ. Substitution. Okay. 50 new the value of force 10 m is the value of displacement cosine 30°. So type 50 * 10 press cosine type 30 press

24:45 equal sign the answer is 433 correct the next problem a car is being knowned by a cable that makes a 45° angle with a road if the tension in the cable is 100 m and the car is 25 m how much work is done by the topping first okay so dito ang tinata Ay ano how much work? So meron tayong value 45° the angle form. Meron tayong 100 and then meron tayong 25 m. Yun yung displacement. Okay? So ang required ay work. Ang formula is work is equal to first times displacement cosine theta. Okay?

25:31 Solution. Substitution lang. 100 N * 25 m cos 45° is equ to 100 1,76.8 8 since 1 natin number na yan for 1,768 joke pero kung very talagang very ano tayo technical may decimal sige exploring a power problem solving so mga done work anong so natandaan ba naintindihan yung concept or the concept of work very good so proceed na tayo sa power understand the concept of power and solve problems using the formula ah na using the power formula. Okay. So before that, what is power? Doon sa learning competency pa

26:17 lang pinaliwanag na yung power. Power is the rate of doing work. It tells how fast work is done. Kung gaano kabilis natapos yung work, that's power. Okay? So may time doon. Gaano ba kabilis natapos yung work? Kaya they are connected and it comes to relationship. they are connected. Okay? Let's say gaano katagal mo nataas yung isang max power. Gaano kabilis. Okay? So situation when you go upstairs for 30 seconds, you show power and power diyan. Okay? So the unit for power is joule per second or once. Okay. So yung formula natin is power is equ to over time or divided by time or P is equ W /

27:03 2. Nagda-divide tayo. So for this one, power is equal to work um divided by time. Okay? And then pag hahanapin naman natin ay work pero ang given ay power and time ay magta-times tayo. Work is equal to power times time. Pag time naman and then ang given ay work and power ay time is equal to work divided by power. Okay, sige. Simple as that. Pero let's say ang given mga anak ay let's say ang given ay time. May time. Ang given ay force and then may displacement pero walang work. Pero may force and displacement. So para makuha mo yung work syempre mo lang yung force and displacement. Napakaasy

27:48 easy sir okay so sample problem one Lino did not have a good day yesterday so J st in the middle of the street he called for some volunteers to help push the vehicle 150 m away from where it stopped the amount of force that they applied chney was 1,200 they push the chney for 15 minutes. Det er mein the power of the volunteers the vehicle. Ang tinatanong ay power pero walang work. Yun nga ang sinasabi ko sa inyo mga anak. Okay? May given a force, may given a displacement pero walang work. So ipagte-t mo lang yung force and displacement. So ito yung given natin. Okay? So walang work tayo. Okay? Pero yung time 15 minutes ang

28:35 required ang tinatanong power. Okay? So ang sabi nito, find first the value to solve the power. Okay. So para ma-solve natin yung work, work is equal to first times displacement. Okay? So ito yung formula. So substitute. 1,200 new 150 m is 180,000 jou. So may work na tayo. So ano ulit yung formula ng power? Power is equal to work divided by time. So substitution 180,000 joule. So the value of work and then the 900 second. Sir, sir, bakit second? Yun yung time. Okay, I-convert mo kasi mga yung 15 minutes into seconds. So, 15 minutes is equivalent to how many seconds? That's 900 seconds. So, 180,000 divided by 900

29:22 seconds is 200 watts. Okay, so clear? That's the value of power. What about this one? One has 5 watts of while lifting a box to a height of 4 m in the wing. So he exerce 90 new of course how long did he do the task? Ang tinatanong dito time. So ang given natin 5 watts. That's the value of power. 4 m meron tayong displacement and 19 new of force. That's the value of course walang work. Pero pwede nating i-diretso ito mga anak. Okay. So ito yung ating given power. 5 wat force is 90 new. Displacement is 4 m. Okay? Required time. Ang ating gagamiting formula time is equal to work divided by

30:10 time is equal to work divided by power. So substitute since yung ating work ay ang ita-times lang naman diyan ay force and displacement. Okay. So yung diretsyon na natin force times displacement 90 N 4 m is equ to 360 / 5 is equ to 72 seconds. So ah ganon kahaba. Okay? Natapos yung ating task namin tatlong seconds. Okay? So hopefully okay na tayo doon. Formative assessment multiple choice. Choose the letter of the correct answer. So Joshua raises a tax with a weight of 100 with a weight of 120 new. Okay? At a height of 2 m. Okay. The

30:59 work done by Joshua is babaguhin natin iyung problem. Ayan na bago ko na. Pinan ko na yung weight. Joshua raises ax with a force of 120 new at a height of 2 m na work done by Joshua 8. So ang gagawin lang natin dito is magta-times lang tayo. 120 * 2 = 240. Okay? It's letter D. Okay. 140 jou. What is the power of output when 20 J is done by an object for 5 seconds? Okay. So ang gagawin lang natin dito magde-divide lang tayo kasi work time. So 20/ 5 is 4 watts or letter D. Okay. What is the

31:47 value of 5.5 kW hour in Jul? Okay. Actually hindi ko to nasabi but it's letter C ano? 19.8 106 J. Okay. So, next, what is the work done to a 10 kog object that is raised to a height of 2 m? Okay, ang given 10 kg at ang height 2 m. Pero ang tinatanong work, what is work? Ay ' ba ang formula natin mga anak sa work is work is equal to force times displacement. So hahanapin muna natin yung force. Eh wala po sir force. So mag-iisip ka na eh. Paano mo mahahanap yung force? Ano ba yung formula ng force? Naturally its force is equal to mass. May mass ba yes than kilogram times acceleration? Sir, ano yung acceleration?

32:32 So wala naman diyan. So ang ginawa mo tinas mo may gravity yun. So anong bali ng gravity dito? 9.8. So 10 * 9.8 is equ to ang sagot 10 * 9.8 is equ to 98. Ano? So check na ako. Ako'y nagmano-mano. 10 * 9.8. Correct ako. Correct o 'di ba? 98. Okay. So 98. Ngayon meron na tayong 4. So 98 Okay. 2 is equ to okay 196. So it's 8. Okay. Number five. How much work is consumed when a 500 watt blender runs for 8 seconds? Ang tinatanong ay work. Ano? Okay. Pero ang human natin ay power

33:18 and time. Okay. So ano po ang ating formula pag work para tapos ang gin? So work is equal to power. Okay. Hour times time. Okay. Magta-times tayo dito. So 500 8 is equ to okay it's 4,000. Ayan. So hopefully it learns ay meron pa pala. So true or false? So write true if you agree with a statement and write false if you disagree with the statement. If answer is false, change the underline word to make it uh correct. So work is a quantity. Okay. False ano? So it's a scalar quantity. Actually ang work natin anak ay scalar. Though may mga

34:03 vector tayong ginagamit like first and displacement pero actually siya ay scalar. Okay? So wala siyang pakay sa direction. Okay? Basta yun yun. Pero ang ginamit nating mga quantities ay more vector ano. So next the faster work is accomplished the higher power is produced. Okay? Syempre it's ano frictional force. produces negative work for removing objection it's true pa din sabi ko kanina maximum work is produced when the first and displacement are perpendicular each other is false. Pag perpendicular zero ah work power is directly proportional to time and inversely proportional to work it's false. Actually power is inversely proportional to time and directly

34:48 proportional. Okay. So ano bang ibig sabihin ng inverse? Magkabaligtad kasi pag power ay mataas, okay, mababa yung time, okay? Or napakabilis lamang. And then pag mataas yung power ay mataas din yung work. Okay? So directly proportional sila. Okay? Kumbaga parehas pag sinabi na nating directly proportional parehas yung tinutulo. Pag inversely iba. opposite. So hopefully you learn something today. Thank you so much mga anak. Medyo naliwanagan tayo.