Unit 4 Test: Forces and Motion

Front

What is force?

Back

A push or pull on an object that can cause it to move, stop, or change direction.

Front

What is motion?

Back

The change in position of an object over time.

Front

What is Newton's First Law of Motion?

Back

Objects at rest don't move unless an unbalanced force acts on them, and objects in motion don't slow down, speed up, stop, or turn unless a force makes them do so.

Front

What are balanced forces?

Back

Forces that are equal in size but opposite in direction, resulting in no change in motion.

Front

What are unbalanced forces?

Back

Forces that are not equal and can cause an object to start moving, stop moving, or change direction.

Front

What is gravity?

Back

A force that pulls objects toward each other, such as the force that pulls objects toward the Earth.

Front

What is friction?

Back

A force that opposes motion between two surfaces that are in contact.

Front

What is acceleration?

Back

The rate at which an object changes its velocity, which can be an increase or decrease in speed.

Front

What is mass?

Back

The amount of matter in an object, which does not change regardless of location.

Front

What is speed?

Back

The distance an object travels per unit of time.