Question

I need help with a physics question really fast! Will give medal and fan!
Which of these is true of an inelastic collision between two objects in a closed system but not of an elastic collision?
Total momentum is conserved.

Total kinetic energy is conserved.

Kinetic energy is less after the collision.

Total momentum is not conserved.

Answer 1

An elastic collision is an encounter between two bodies in which the total kinetic energy of the two bodies after the encounter is equal to their total kinetic energy before the encounter.

Answer 2

An inelastic collision, in contrast to an elastic collision, is a collision in which kinetic energy is not conserved.

Answer 3

Total momentum is not conserved

Answer 4

Inelastic collisions may not conserve kinetic energy, but they do obey conservation of momentum

Answer 5

yeah

Answer 6

So, it's total momentum is not conserved?

Answer 7

yep

Answer 8

In an inelastic collision, the pair of objects possess less kinetic energy in their translational motions after the collision than before.

Answer 9

I don't think Malachi is correct.

Answer 10

What would it be then?

Answer 11

I also have one more question if either of you can help on that one.
Which of these is true about momentum and kinetic energy in a collision within a closed system?
Momentum is conserved, but total kinetic energy is not conserved.

Momentum is conserved, but total kinetic energy may or may not be conserved.

Momentum may or may not be conserved, but kinetic energy is always conserved.

Momentum is not conserved, but kinetic energy is always conserved.

Answer 12

@perl

Answer 13

thats the answer i just looked it up

Answer 14

Momentum within a closed system is always conserved, but kinetic energy may or may not be conserved. If kinetic energy is conserved in a collision, then it is known as a perfectly (or totally) elastic collision. If it is not conserved, then the collision is inelastic.