Lab: Conservation of Linear Momentum — Unit test Answers

Jerome places a bag of flour on a scale. The scale shows that the bag has a weight of 17 N. Which is the reaction force of the bag sitting on the scale?

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.

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

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

The forces acting on a child sitting in a seat are described by the free-body diagram shown.

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 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 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 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.

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.

The free-body diagram of a crate is shown.

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

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.

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?