6.2 Lesson - Conservation of Momentum

Conservation of Momentum

Chapter 6 Section 2

Multiple Choice

A batter hits a baseball back to the pitcher at the same speed as the pitch. Which of the following is true?

• The magnitude of the ball's momentum is greater after the batter hits the ball.

• The magnitude of the ball's momentum is less after the batter hits the ball.

• The magnitude of the ball's momentum is the same before and after the batter hits the ball.

Multiple Choice

A steel marble collides with a billiard ball that is initially at rest. Which of the following is true?

• The momentum of each object increases.

• The momentum of each object decreases.

• The momentum of the billiard ball increases, and the momentum of the marble decreases.

• The total momentum before and after the collision is zero.

Multiple Choice

Two ice skaters, initially at rest, push off one another. Their final momenta are...

• equal in magnitude and direction.

• equal in magnitude and opposite in direction.

• in the same direction but of different magnitudes.

• in opposite directions but of different magnitudes.

Multiple Choice

When two objects interact in an isolated system,...

• the momentum of each object is conserved.

• the total momentum of the system is zero.

• the total momentum is conserved only if the objects move in opposite directions.

• the total momentum is always conserved.

Multiple Choice

Which of the following expresses the law of conservation of momentum?

• The total momentum of an isolated system is zero.

• The total momentum of any system maintains a constant momentum.

• Every object in an isolated system maintains a constant momentum.

• The total momentum of an isolated system remains constant regardless of the forces between the objects in the system.

• The total momentum of an isolated system could remain constant depending on the forces between the objects.

Multiple Choice

A billiard ball hits the edge of another billiard ball that is initially at rest. The second ball moves off at an angle. Which of the following is true?

• The momentum of the first ball doesn't change.

• The momentum of the second ball doesn't change.

• The total momentum of the system increases.

• The momentum lost by the first ball is gained by the second ball.

Multiple Choice

Each croquet ball in a set has a mass of 0.500 kg. The green croquet ball travels at 10.5 m/s and strikes a stationary red ball. If the green ball stops moving, what is the final speed of the red ball after the collision?

• 10.5 m/s

• 5.25 m/s

• 21.0 m/s

• 0.0476 m/s

• 0.00 m/s

Multiple Choice

During a performance, a circus clown tosses a 10.5 kg prop at his 86.2 kg clown partner, which is wearing roller skates. The partner, who was initially at rest, begins to move 2.0 m/s towards the crowd when he catches the prop. What is the initial velocity of the prop before the collision?

• 0.22 m/s towards the crowd

• 0.24 m/s towards the crowd

• 14 m/s towards the crowd

• 16 m/s towards the crowd

• 18 m/s towards the crowd

Multiple Choice

A 55 kg boy running east at 2.0 m/s jumps onto a 2.0 kg skateboard. What is the final velocity of the boy and the skateboard?

• 2.0 m/s east

• 1.9 m/s east

• 1.8 m/s east

• 1.7 m/s east

• 1.6 m/s east