Unit Test — Unit test Answers

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

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

An elevator has a weight of 14,700 N and has an acceleration of –0.30 m/s2. The free-body diagram shows the forces acting on the elevator.

Two objects are interacting, but stay stationary. Which best describes what is happening to the action and reaction forces?

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.

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.

An object has a mass of 15 kg and is accelerating to the right at 16.3 m/s2. The free-body diagram shows the horizontal forces acting on the object.

According to Newton’s second law of motion, the acceleration of an object is inversely proportional to which quantity?

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.

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.

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.

An object with a mass of 20 kg has a net force of 80 N acting on it. What is the acceleration of the object?

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

A box is pulled up a rough ramp that makes an angle of 22 degrees with the horizontal surface. The surface of the ramp is the x-plane.