Impulse and Momentum — Unit test

Question 1

A 150 g egg is dropped from 3.0 meters. The egg is moving at 4.4 m/s right before it hits the ground. The egg comes to a stop in 0.072 seconds.

Revolt · Accepted Answer

9.2 N

Question 2

A large truck is moving at 22.0 m/s. If its momentum is 125,000 kg • , what is the truck's mass?

Revolt · Accepted Answer

5680 kg

Question 3

How does an airbag help protect a passenger in a car following a car accident?

Revolt · Accepted Answer

It increases the passenger’s stopping time, and this decreases the force.

Question 4

Following an inelastic collision, what can kinetic energy be converted into? Check all that apply.heatimpulsemomentumpotential energysound

Revolt · Accepted Answer

heat; potential energy; sound

Question 5

A student is working in a lab to determine how time affects impulse. The student keeps the force the same in each trial but changes the impact time. Some data is shown.

Revolt · Accepted Answer

trial 3

Question 6

A lab cart with a mass of 15 kg is moving with constant velocity, v, along a straight horizontal track. A student drops a 2 kg mass into it from directly above, and the cart continues moving.

Revolt · Accepted Answer

15vi + 2(0) = (15 + 2)vf

Question 7

A 225 kg red bumper car is moving at 3.0 m/s. It hits a stationary 180 kg blue bumper car. The red and blue bumper cars combine and hit a stationary green bumper car of mass 150 kg. The red, blue, and green bumper cars all combine.

Revolt · Accepted Answer

1.2 m/s

Question 8

A boy is running to the east and jumps into a stationary boat in a lake. Once the boy lands in the boat, the boat moves to the east.

Revolt · Accepted Answer

The initial momentum of the boy is equal to the boy/boat because the final velocity of the boat is less than the initial velocity of the boy.

Impulse and Momentum — Unit test Answers

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