A hockey puck sliding on a frictionless surface strikes a box at rest. After the collision, the two objects stick together and move at some final speed.

Which of the statements describes the change in momentum and energy of the puck during the collision?

a) The puck loses some, but not all, of its original momentum and mechanical energy.

b) One cannot determine if the momentum or energy of the puck is conserved without knowing the final velocities and masses of the two objects.

c) The puck loses some momentum in the collision but conserves its mechanical energy.

d) The puck conserves its original momentum but loses all of its mechanical energy.

e) The puck conserves its original momentum and mechanical energy.

f) The puck conserves its original momentum but loses some, but not all, of its mechanical energy.

Question

Physics

Cierra Riley

3 November, 00:33

A hockey puck sliding on a frictionless surface strikes a box at rest. After the collision, the two objects stick together and move at some final speed.

Which of the statements describes the change in momentum and energy of the puck during the collision?

a) The puck loses some, but not all, of its original momentum and mechanical energy.

b) One cannot determine if the momentum or energy of the puck is conserved without knowing the final velocities and masses of the two objects.

c) The puck loses some momentum in the collision but conserves its mechanical energy.

d) The puck conserves its original momentum but loses all of its mechanical energy.

e) The puck conserves its original momentum and mechanical energy.

f) The puck conserves its original momentum but loses some, but not all, of its mechanical energy.

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Answers (1)

Know the Answer?

Charlie Lyons · Answer 1

f) The puck conserves its original momentum but loses some, but not all, of its mechanical energy.

Explanation:

It is a case of perfectly inelastic collision. So momentum will be conserved because no external force acts on them during the collision. But there will be loss of energy (kinetic energy). It will be in the form of sound or heat that is produced during collision. They will still have some kinetic energy even after the collision.