Need help with physics, please help, its multiple choice?

In a system with two moving objects, when a collision occurs between the objects: A. The total knetic energy is always conserved. B. The total momentum is always conserved. C. THe total kinetic energy and total momentum are always conserved. D. neither the kinetic energy nor themomentum is conserved. E. none of the above choices are valid.
Answer:

When a collision occurs between two moving objects the total momentum is always conserved. Depending on the situation, Kinetic energy could be conserved. If there are frictional losses, or heat losses, then no, kinetic energy is not conserved; therefor if this is a real world application the answer is no, kinetic energy is not conserved, although if it is a quasi-equilibrium problem, then there are situations where you could consider the kinetic energy conserved. To simplify...go with letter B kid.

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Other answers

not sure... im on the edge for A or B, just a guess

Bob

When a collision occurs between two moving objects the total momentum is always conserved. Depending on the situation, Kinetic energy could be conserved. If there are frictional losses, or heat losses, then no, kinetic energy is not conserved; therefor if this is a real world application the answer is no, kinetic energy is not conserved, although if it is a quasi-equilibrium problem, then there are situations where you could consider the kinetic energy conserved. To simplify...go with letter B kid.

Ringhold...

Momentum is always conserved. In a perfectly elastic collision, kinetic energy is conserved, but in any other kind of collision (i.e. in all real collisions!) kinetic energy is not conserved.

David Geelan

B. The total momentum is always conserved.

NQS

Momentum is always conserved. In a perfectly elastic collision, kinetic energy is conserved, but in any other kind of collision (i.e. in all real collisions!) kinetic energy is not conserved.

David Geelan

B. The total momentum is always conserved.

NQS

not sure... im on the edge for A or B, just a guess

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