A hockey pick sliding along a frictional surface strikes a box at rest, after th

Question

A hockey pick sliding along a frictional surface strikes a box at rest, after the collision the two objects stick together and move at the same final speed. Which of the following describes the change in momentum and energy of the puck during the collision? A) puck loses some but not all of its original momentum. B) one cannot determine C) puck conserves original momentum, but loses all mechanical energy D) puck loses some momentum but conserves mechanical energy E) puck loses conserves all momentum and mechanical energy F) conserves momentum but loses some mechanical energy Which of the following describes the change in momentum and energy of the combined puck and box? A) system loses some but not all of its original momentum. B) one cannot determine C)system conserves original momentum, but loses all mechanical energy D) system loses some momentum but conserves mechanical energy E) system loses conserves all momentum and mechanical energy F) conserves momentum but loses some mechanical energy

Explanation / Answer

The puck and box together constitute the system... So, part 1 : A) puck loses some but not all of its original momentum. Reason: momentum of the system is conserved...not of every body... Part 2 : F) conserves momentum but loses some mechanical energy This is inelastic collision..so momentum is conserved..but energy is lost as thermal energy...

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