Unit 6 Exam Practice

Forces occur in pairs. The first force is called the action force. The second force would be called the:

• moving force.

•  momentum force.

• reaction force.

• kinetic force.

In the absence of friction, if a force acting on a moving object stops acting, the object will:

• stop moving.

• move at a slower speed.

• speed up.

• keep moving at a constant speed.

A change in position of an object is its ___________.

•  motion

• acceleration

• speed

• inertia

Three forces are acting upon the box shown in the diagram below.

Assuming there is no friction between the floor and the ground, how will these forces affect the position of the box?

• The forces will cause the box to move to the left.

• The forces will cause the box to move to the right.

• The forces will cause the box to collapse to the ground.

• The forces will be unable to move the box in any direction

Earth has a large mass, which requires a _______ force to _________ its motion. 

• small/maintain

• small/change

• large/maintain

• large/change

This diagram shows a segment of a roller coaster. As the roller coaster car moves from Point A to Point B, its speed increases. Why?

• The force of friction decreases on the downhill track.

• The inertia of the roller coaster car decreases.

• Balanced forces act on the roller coaster car.

• Unbalanced forces act on the roller coaster car.

hich of the following best completes this sentence? In every interaction, forces occur in ___________.

• specific places

• single unit

• pairs

• one direction only

According to Newton's third law, which statement describes why it is difficult to walk on an icy pond?

• Your shoes push against the ice, but the ice cannot push your shoes.

• Extremely low friction between your shoes and the ice eliminates traction to move you forward.

• The ice is cold so it crumbles as you push against it.

• The ice melts under your shoes, making it much more slippery.

Forces that are equal in magnitude but opposite in direction are:

• balanced forces

• unstoppable forces

• unbalanced forces.

• universal forces.

Mass is a measure of which of the following quantities?

• energy

• matter

• space

• motion