Momentum

Question 1

Objects 1 and 2 collide and stick together. Which best describes the momentum of the resulting single object?

Revolt · Accepted Answer

D: It is equal to the momentum of object 1 plus the momentum of object 2.

Question 2

A 50 kg pitcher throws a baseball with a mass of 0.15 kg. If the ball is thrown with a positive velocity of 35 m/s and there is no net force on the system, what is the velocity of the pitcher?

Revolt · Accepted Answer

A: −0.1 m/s

Question 3

When someone throws a ball, the action force is the person pushing on the ball. What is the reaction force?

Revolt · Accepted Answer

A: the ball pushing on the person

Question 4

What is the momentum of a 5 kg object that has a velocity of 1.2 m/s?

Revolt · Accepted Answer

C: 6.0 kg • m/s

Question 5

Football helmets are made with padding that helps reduce head injuries when a player collides with an object. Which best explains how the padding reduces injuries?

Revolt · Accepted Answer

A: It extends the time of the collision.

Question 6

Denise is riding her bike and falls to the ground. During the collision, she hits both grass and cement.

Revolt · Accepted Answer

D: The grass extends the time of the collision.

Question 7

A car has a momentum of 20,000 kg • m/s. What would the car’s momentum be if its velocity doubles?

Revolt · Accepted Answer

C: 40,000 kg • m/s

Question 8

Sheila weighs 60 kg and is riding a bike. Her momentum on the bike is 340 kg • m/s. The bike hits a rock, which stops it completely and throws Sheila forward onto the pavement.If there is no net force on the system, what is Sheila’s velocity immediately after she is thrown from the bike?

Revolt · Accepted Answer

D: 5.7 m/s

Question 9

The diagram shows two balls before they collide.

Revolt · Accepted Answer

B: 0.2 kg • m/s

Question 10

The chart lists the masses of four balls that have the same momentum.

Revolt · Accepted Answer

B: The red ball has a greater velocity than the purple ball.

Momentum Answers

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