Law of Conservation of Momentum and Kinetic Energy

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6.7Law of Conservation of Momentum and Kinetic Energy

Law of Conservation of Momentum and Kinetic Energy Revision Questions

1) Two identical billiard balls move towards each other at 4 m/s and 1 m/s respectively as shown in the figure.

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After a head-to-head collision, the first ball moves at 2 m/s in the same direction as prior to the collision. What is the velocity of the second ball after the collision?

  1. 2.5 m/s due right
  2. 1.5 m/s due left
  3. 1.5 m/s due right
  4. 1.0 m/s due right

Correct Answer: D

2) A 2 t freight car is disconnected from its locomotive and stars moving slightly downhill at 1.2 m/s. It collides with another 3 t freight car at rest and afterwards, they move together.

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What is the common velocity of the two freight cars after the collision? (1 t = 1000 kg)

  1. 0.48 m/s downhill
  2. 1.2 m/s downhill
  3. 0
  4. 0.8 m/s downhill

Correct Answer: A

3) A 40 g bullet moving horizontally at 400 m/s hits horizontally a 2960 g wooden block initially at rest. After the bullet is stuck on the wooden block, the system moves together along a horizontal surface whose friction coefficient is 0.4. How far can the system move in these conditions? For convenience, take g = 10 m/s2.

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  1. 5.33 m
  2. 0.67 m
  3. 3.56 m
  4. 35.6 m

Correct Answer: C

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