Question

prove conservation of energy?

Answer 1

@panlac01,@Neemo @ash2326 @zepp

Answer 2

@HERO

Answer 3

What energy are you talking about? Mechanical energy?

If you mean total energy, (even if a specific answer is expected for this question) it is good to know that energy is a concept that was historically created to be conserved. Every time a non conservation was observed, a new type of energy was created to account for the missing value. (e.g. potential energy)

Answer 4

yes about mechanical energy

Answer 5

@Vincent-Lyon.Fr

Answer 6

Start with N's 2nd law with a conservative force then:
- multiply by velocity
- take time integral and identify kinetic energy and potential energy associated to the conservative force

Answer 7

after that

Answer 8

now i hav 2 go so, can u solved it in detail i will be thankful 2 u 4 that .

Answer 9

well i can explain it with some example
that would be enough or you want derivation??

Answer 10

well @ruchi you can consider an example of projectile
total energy of projectile at any point is conserved that is k.e. + p.e.
at starting point k.e. is max because velocity is max
w.r.t. velocity ( v ) decreases so k.e.(1/2mv^2) decreases too but as incerease in height ( h ) of projectile p.e.(p=mgh) incresses
at heighest point k.e.=0 and total energy=p.e.
at time of prejection and time when projectile strikes floor p.e.=0 total energy=k.e.
so kinetic and potential energies vary inversly proportional to make total energy conserved.

Answer 11

@Ruchi.

Answer 12

I already sent him a paper proving that conservation of energy exists

Answer 13

about to send him a lecture done by Feynman also.

Answer 14

oh good @panlac01 send me too i will study it i might learn something

Answer 15

http://finedrafts.com/files/feynman/physics/Vol%201%20Ch%2004%20-%20Conservation%20of%20Energy.pdf

Answer 16

http://www.physicsforums.com/showthread.php?t=49809

Answer 17

Energy given is energy used up