I was wondering if kinetic energy is conserved during elastic collisions like when friction is not involved and neither is any other resistance. I was wondering if it was conserved if one object was standing still and the other hit it and also when both were moving at each other.
2006-10-05 03:50:17 · 5 answers · asked by amalyn 2 in Science & Mathematics ➔ Physics
An elastic collision is defined as one in which both conservation of momentum and conservation of kinetic energy are observed.
2006-10-05 03:57:31 · answer #1 · answered by bequalming 5 · 6⤊ 0⤋
Yes, Kinetic Energy is conserved in Elastic collisions
2006-10-05 04:24:04 · answer #2 · answered by mailfortarun 1 · 3⤊ 0⤋
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Is kinetic energy conserved in elastic collisions?
I was wondering if kinetic energy is conserved during elastic collisions like when friction is not involved and neither is any other resistance. I was wondering if it was conserved if one object was standing still and the other hit it and also when both were moving at each other.
2015-08-06 07:05:37 · answer #3 · answered by Anonymous · 0⤊ 0⤋
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Collisions are elastic if the energy exchanges that occur during collision are fully reversible without any losses that cannot be recovered - eg a collision producing sound or heat energy cannot return this energy to the objects. The best example of an elastic collision is the collision between gas (air) particles - vast numbers of these collisions occur around us all the time yet no sound or heating effect is produced. The reason for this is the particles not actually touching each other as they 'collide' - the electrostatic repulsion between their electrons does the 'pushing'. Repelling magnets would do the same (unless the magnets came together at very high speed). Rubber balls can, sometimes, nearly return all the energy that squashes them in a collision - but a small amount always transfers into heat as the particles inside are left vibrating more after the impact. It isn't possible for both objects to remain at rest after an impact, momentum has to be conserved - if it is transferred to another object then that object moves.You might be thinking about a lump of chewing gum or plasticine being dropped on the floor - there is no rebound and both objects appear to be at rest after the collision. But not so ! - the momentum has been shared with the Earth .. but the Earth is so massive that it's speed change is imperceptible (it would be noticeable if the gum had a mass about 1/10 the mass of the Earth ! .... but then who could lift it to drop it?) It is possible for one to be at rest after a collision. A head-on elastic collision between equal masses, with one initially at rest, does this ... afterwards the moving mass stops and the stationary one goes off with exactly the same speed as the moving one had.(roll a tennis ball into a head-on collision with a stationary one .. it nearly works)
2016-04-10 05:23:44 · answer #4 · answered by Cindy 4 · 0⤊ 0⤋
The momentum of a system is conserved for any collision, in the particular case of an elastic collision, the kinetic energy is also conserved, but this ONLY goes for a completely elastic collision!
2006-10-05 04:34:19 · answer #5 · answered by Jens F 2 · 5⤊ 0⤋
Yes, kinetic energy is definitely conserved in elastic collisions--in inelastic collisions as well.
2006-10-05 03:53:03 · answer #6 · answered by bruinfan 7 · 0⤊ 9⤋