Conservation of Energy Physics Problems

This physics video tutorial explains how to solve conservation of energy problems with friction, inclined planes and springs.
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PDF Worksheet - 15 Questions:
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• Conservation of Energy...

[@TheOrganicChemistryTutor]

Physics PDF Worksheets: www.video-tutor.net/physics-basic-introduction.html Full-Length Videos & Exams: www.patreon.com/MathScienceTutor/collections Direct Link to The Full Video: bit.ly/3vFF9r4

[@tlili3990]

it took you like 10 seconds to explain why does the trolley have potential energy meanwhile my physics teacher couldnt through the whole semester. You're amazing

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How on earth do you have 9 physics assignments due?

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@@xrecon18 her teacher assigned 9 physics assignments

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[@williamshiflet538]

@@ianfrancis5905 I do not. I go to UC Berkeley.

[@JH-hb5cc]

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[@williamshiflet538]

@@JH-hb5cc this was for 7A. Just finished my second midterm for 7B tonight.

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I have like 20.mins b4 my physics unit teat, ur saving me rn

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how did you do?

[@masoud6398]

I think everyone will understand better if you use this eq for the last problem : m g Hc +1/2 m Vc^2 = m g Hd + 1/2 m Vd^2. You thought me so well. Thank you so much

[@Ana-mu1td]

I used that equation and got a different result I've been trying to understand why :(

[@jonathan-ww3sx]

Thanks a lot, I’m taking AP Physics 1 and this is what I need.

[@ramishahmed8709]

What textbooks do you use?

[@bluesusername]

did you pass (the class and test)and if so how

[@BradenWhite624]

Dude you magician, the day before my conservation test?

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[@roshankarunathilaka2157]

I love when he said "the kinetic energy is very low. Let me make sure that's right. And yeah that's it."

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[@Findgod222]

15mins

[@Findgod222]

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[@monkeblazer3154]

for the last question is answer 37.5 m

[@shantahalder9061]

I have a request. While adding new videos, please do that in context of an existing (or, if necessary, newly created) playlist. It becomes difficult to keep track of randomly uploaded Videos which respectively fall into several random categories (unless sorted) and searching them manually to discover which video is on what topic is not efficient. Feedbacks appreciated. Thanks.

[@shantahalder9061]

@Lee-Anne Stevenson I don’t know what you mean. Anyway, is that accessible to just anybody?

[@DukeKirby]

In the first question it states that the box slides down 150m inclined plane. I noticed when you went to plug in your number for height you used the 150m; would you not use 150m as the hypotenuse in order to solve for the height?

[@dhaneperalta3775]

This is really helping!! Thank you so much!

[@Lordcoby]

Im a 9th grader, but the fact that you teach these so simply. It even helps me even though this stuff is for higher grades... Thans a lot!

[@Lordcoby]

@@royinnoce2349 huh?

[@rodokmen1300]

@@Lordcoby simple are the graphic stuff but the math aroubd it impossible lol

[@FreshBeatles]

@@rodokmen1300 how is this math impossible

[@osmanaltanyuksel1884]

16:28 How we can say that KE = Thermal energy ?, doesnt some of the KE will be converted into sound energy ?

[@lilysseize]

Thank you so much, hope this help me pass my final

[@daniellatiger6220]

For question 3, part B; why is the work of friction not negative?

[@selimfazliu577]

The work of friction it is negative at the part (A), PE + KE - W = KE. But when it comes to the part (B), it becomes positive. PE + KE = KE + W.

[@luvochiya4134]

I'm so sorry for asking this Mr. JG, should we add those Kinetic energies or subtract them since the objects are moving in different directions?🤔

[@michaelsibusiso5431]

I guess since is an elastic collision so we had to add

[@binoanil6954]

its kinetic energy, it is v^2 so it does not matter whether velocity is negative or not, the result is a positive ( i'm not sure)

[@heycherry9726]

Absolute life saver thank you ❤

[@SkilledApple]

Physics is cool.

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Thanks

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[@logronokeith9660]

@@yuri_black_zero what

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[@writersblock1016]

Just wanna double check my understanding, but is the work done by friction equivalent to heat/thermal energy? Since heat energy is energy lost from the total mechanical energy?

[@denzapalooza9482]

WHERE WAS THIS WHEN I NEEDED IT FOR MY TEST SHXJSBXNBDX

[@khantsetthein200]

are we supposed to neglect sound energy in those collision problems??

[@aadibelwal4804]

For the last problem that you need patreon access for, is the answer 37.49 meters?

[@isigh.]

For number 3 its easier if u just use the the final velocity you get from part a and use it as the initial and the work equation is now Initial Kinetic=Final Kinetic + work done by friction

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[@Engineering-To-Infinity]

I just subscribed to your patreon and I can find the full video of this

[@aribeanaemmanuel1406]

Gravitational constant has always been 10 in my school, please can you tell me why you used 9.8?

[@chishamulenga8957]

Pa unza aba bena teti bakwanishe

[@rataulesego2052]

Hi. Can I ask why the 9.8 does not include negative like in projectile motion?

[@dangerous_woman]

@@rataulesego2052 g = 9.8m/s^2 but in projectile motion for the equations a = -g is taken because the gravitational force creates an acceleration downwards for an individual object, think of g and a as two different values which coincidentally has the same numerical value with different directions

[@MAhmad-tg]

I too now pronounce object and product as objec and produc thx to you bro!😅

[@geraldsalaveria8818]

On number 3 part b, why is it that the work created by the friction is positive? Isn't it negative since it opposes to the motion?

[@alexTillery]

This helps so much, thank you

[@ezudinezere6034]

Literally I have addicted with your voice

[@carat5665]

Thank you for the video!

[@yoan_b]

Thank you

[@muaazahmad4981]

At 15:18 , will the 12 kg block also coul create sound energy , so will some of the energy be wasted

[@harshdarji1122]

4:49 We can also do 1/2 kx^2 = mgh for the right? coz 1/2kx^2 = 1/2 mv^2

[@yuvalkoren4070]

Did anyone else do the last question before the video cuts off? Is it 37.5m if you assume g=10 (and not 9.8 as he usually does)?

[@dmitoriithecooler8521]

Yeah, I got the same answer. I just plugged the square of speed straight into the equation (g=9.8)

[@TahaElAmineHaddouche]

can you explain how you got the answer , please ?i feel like i am missing something

[@yuvalkoren4070]

@@TahaElAmineHaddouche You assume E1=E2 when E1 is mgh when the object is at rest at the beginning, and E2 is (mv^2)/2+mg(2r), and solve for h. The velocity in E2 is the critical velocity that the object needs to have (at the very least) to continue in a circular motion and not drop off midway. The critical velocity is measured by the square root of the acceleration due to gravity (a=g=10m/s^2 in the Earth's case) times the radius of the circle. If you want I can send you a picture of the calculation.

[@pankajvishwakarma4866]

Work energy theorem is better than it I always use WET Because it is easy and if friction is given than we can't find potential energy of friction by mechanical energy conservation

[@nathanandrews8048]

this is a really good video!

[@rimazasaleek6085]

Hello! I just had a question about number 6. For number 6 part (b) it said to find how high is point C relative to point B, but I think you found it relative to point A?

[@zs1175]

Hi, I just wanted to help out. I think it doesn’t matter in this case because the height at point B is 0m. 29.57-0=29.57. So you can calculate the height of C with A. You could also do calculate with B if you wish (using kinetic energy) and you should get around the same answer.

[@rimazasaleek6085]

@@zs1175 Ohh that makes sense! Thank you so much for the clarification I really appreciate it :D

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My mans just saved my grade

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tqsm

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Physics final in less than an hour 😂, thank you

[@brendanmcnally2335]

Thank you!!!

[@parkerwong798]

Great video

[@charlesdesouza9313]

in 16:00 isnt the energy negative, since it's the variation between the final KE and the initial KE? the final KE would be 0 and the initial, 1350J...

[@samanthagupton1865]

How I would think about it is the work done is positive because the force and distance are in the same direction, which equals the change in KE. There are no opposite vectors to make a negative change in kinetic energy in this problem.

[@cricketfans207]

I have 12 physics numericals to finish thanks it helped me a lot 👍 Btw icse syllabus is tuff

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Please make a video on gluconeogenesis pathway.. A BCH student in need.. Thank you

[@user-gy7hi9qv3u]

Ok, so quick question why is it that when it is frictionless you are removing all of the m in question 4 but when it is friction you are plugging in the values for m?

[@dangerous_woman]

He can take m as a common factor on both sides and cancel it out if there’s no friction, for example mgh = 1/2mv^2 (the m’s go). But if there’s friction since m is not a common factor he has to include it, like mgh = 1/2mv^2 + W (m can’t go). Hope this helps.

[@madhawagamage1036]

Bro in question num 2 , why did not u use Kinetic spring ( KE spring) to the equation?

[@revnirgaming7926]

ke spring is equal to kinetic energy so its the same thing

[@W81HotPotLickin2nd]

on 6c wasnt it asking for c relative to b? b is at h=0 so the problem should be different

[@Malektamo]

No bitches ?

[@layaldergham45]

can someone explain why problem five the second car does not have a negative velocity ? if it is moving in the west direction

[@EthanPricco]

Although it wasn't specifically said, the problem seems to be implying that it wants the TOTAL thermal energy.

[@unknown-mn9wo]

16:37 why nor negative 1350? since this is the energy lost.

[@Ana-mu1td]

You're talking about the number of energy lost. Technically, it is correct to say the positive number. For example, you can say "I lost 30 dollars gambling yesterday" or "My back account has -30 dollars/my account went 30 dollars negative" so you can say energy exchanged/gained was -1350 or 1350 was lost

[@user-bi7sk9nl8w]

I have mid exam next week so what I do

[@peytonsid8452]

THANK U FOR YOUR SERVICE SIR

[@eealec2138]

On question 2, how does the angle of the hill not affect how high it will go?

[@malekhaddad5860]

This was months ago so you prob figured it out by now, but in case someone else has this same question, gravity is independent of the path taken, think of it as always pushing down. So whether you are going sideways or not has no effect. Since gravity is the only force playing a role in how high up the hill it will go, the angle does not affect it.

[@saf8637]

@@malekhaddad5860 hello

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@@saf8637 hello

[@oguzgonul2584]

At 6. question part b there is h right? So mgh will end up 0? but if we use 1/2*m*v^2 we can have values? idk shit bout physics just i didnt get it wtf

[@yusuphajarju4641]

the question 3 your final equation were did you get 2ad.

[@MarkHivosk]

watching this helps me not feel pain even though I don't know how to solve because I dont know the energy formulas

[@baguette9669]

5:52

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[@yuno6697]

hmmmmmm

[@michaelnelsonacmespeedshop7302]

Thanks!

[@stinkyahh4551]

GOAT.

[@Maharlikan_Federal_Empire]

At 1:43, how did you get the 9.8 Sir?

[@yanyan5195]

it's constant g (gravity) = 9.81m/s^2

[@Maharlikan_Federal_Empire]

@@yanyan5195 Thanks my man

[@pirx660]

This was super helpful thanks

[@melvicxamiergabion7238]

in problem no.5, TKE=KEa + KEb. Since the car B is moving to the left, do you think that should be negative??

[@danielbowers6113]

no because the question is asking for the total thermal energy produced. Therefore direction has no play, only magnitude.

[@planetbizo408]

I Need a big gyat for me to focus on physics

[@northwest-bk5nx]

Thank u avogadros number

[@nobodyreallyknowsdothey]

will let you guys know how my retake goes i watched a lot of these

[@oriegold5575]

update??😭😭 how’d it go??

[@nobodyreallyknowsdothey]

i got a D. good luck guys, and here’s a tip, don’t ignore thermal energy problems even when your instructor doesn’t go over it at all -_-. oh and make sure you know all your conversions and don’t mess up sig figs

[@arbabibrahim6800]

for question 3 part A i got 64.8 m/s.

[@samuelyonas2070]

Legend!!!

[@Thana1549h]

7.54, 4064 where come from?

[@e.reynolds5573]

How come on a slant with an angle there is only potential, but when it’s a hill it’s potential and kenetic on the left side?

[@ppfart4486]

Love this

[@annahwanet767]

Wowwwww Sir wowww....no words

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I am also from ETHIOPIA

[@annahwanet767]

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@@annahwanet767 he is jack of all trades. I'm from ETHIO PARENTS SCHOOL

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@@annahwanet767 interesting how is life in cathedral ?

[@blockhead4221]

10 finally

[@noluthandokhwela5881]

For example 5 why did we not indicate different signs since the cars are moving in opposite directions??

[@douka7590]

@Justin Shayne recommended me to you dear sir. You are a fish.

[@canelaflorin2844]

ok, so for problem 7 i got 37.59 m. How far was i?

[@TahaElAmineHaddouche]

please , can you explain how you got the answer ?

[@joshuabalzarni7747]

how would you solve the third exercise without h?

[@Anthony-pr1cy]

$20 for the full video! Jeeeeeez.

[@grahamflowers]

There is no kinetic energy in a moving mass there is force Mv squared kinetic energy is the energy of consistent work from a consistent force regards Graham Flowers

[@danbocker7398]

🔥🔥🔥

[@555_aumiofardun]

I think it should be (50-15) ..35 instead of 15 in the last part of tha last problem

[@MutiePie]

9 11 21 öðrum ö0æþ

[@user-fp9gu4iz9v]

Please stop yappin