Big Idea 13: Forces and Changes in Motion

Front

What is a force?

Back

A force is a push or pull that can change the motion of an object.

Front

What are the two types of forces?

Back

Balanced forces and unbalanced forces.

Front

What happens when forces are balanced?

Back

When forces are balanced, the object does not move or remains at rest.

Front

What happens when forces are unbalanced?

Back

Unbalanced forces cause an object to move or change its motion.

Front

What is gravity?

Back

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

Front

What is friction?

Back

Friction is a force that opposes motion between two surfaces that are in contact.

Front

How does mass affect motion?

Back

The more mass an object has, the more force is needed to change its motion.

Front

What is inertia?

Back

Inertia is the tendency of an object to resist changes in its state of motion.

Front

What is an example of a balanced force?

Back

Two people pulling on opposite sides of a rope with equal force.

Front

What is an example of an unbalanced force?

Back

A person pushing a car that is not moving.