Big Idea 13: Forces and Changes in Motion

Front

What is force?

Back

A push or pull on an object.

Front

What is balanced force?

Back

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

Front

What is unbalanced force?

Back

Forces that are not equal, causing a change in motion.

Front

What is friction?

Back

A force that opposes motion between two surfaces in contact.

Front

What is gravity?

Back

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

Front

What happens when two forces are balanced?

Back

The object remains at rest or continues to move at a constant speed.

Front

What happens when forces are unbalanced?

Back

The object will accelerate in the direction of the greater force.

Front

How can you increase the motion of an object?

Back

By applying a greater force to it.

Front

What is an example of a balanced force?

Back

Two people pushing a car in opposite directions with the same amount of force.

Front

What is an example of an unbalanced force?

Back

A person pushing a shopping cart while another person pulls it in the opposite direction.