Physical Science Chapter 12 Review

A force is defined as

• A push or a pull that acts on an object

• A type of energy

• A type of motion

• A type of matter

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True or False?

A force can act to cause an object at rest to move or it can accelerate an object that is already moving.

• True

• False

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How can a force change the motion of an object that is already moving?

• A force can accelerate a moving object by changing its speed, its direction or both

• A force can decelerate a moving object by changing its speed, its direction or both

• A force can cause an object to move in a circular motion

• A force can cause an object to move in a straight line

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Choose the best answer.

What force causes a 1-kg mass to accelerate at a rate of 1 min/sec each second? ​ (a)  

• 1 newton
• 1 kg/ms (squared)
• 1 kg/s
• 1 kg *m

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A ​ (a)   force is the overall force acting on an object after all the forces are combined.

• net
• combined
• opposite
• direct

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True or False?

Friction is a force that helps objects that are touching move past each other more easily.

• True

• False

When ​ (a)   forces act on an object, there is ​ (b)   in the object's motion because the net force is zero. When ​ (c)   forces act on an object, the net force is not zero, so the object ​ (d)  

• balanced
• no change
• unbalanced
• accelerates
• an increase
• decreases

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Identify the types of friction.

(Choose all correct answers)

• rolling

• gravity

• static

• sliding

The friction force that acts on objects that are at rest is called

• static friction

• rolling friction

• sliding friction

• air resistance

Match the following friction forces

• walking

• rolling

• pushing a book along your desk

• static

• in-line skates

• sliding