Lesson 3: Force Pairs

Front

What is a force?

Back

A push or pull on an object.

Front

What are balanced forces?

Back

Forces that are equal in size and 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 move or change direction.

Front

What is Newton's Third Law of Motion?

Back

For every action, there is an equal and opposite reaction.

Front

What happens when two objects collide?

Back

They exert equal and opposite forces on each other.

Front

What is gravity?

Back

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

Front

Can forces occur in pairs?

Back

Yes, forces always occur in pairs.

Front

What is an example of a pushing force?

Back

Pushing a door open.

Front

What is an example of a pulling force?

Back

Pulling a wagon.

Front

What is the relationship between mass and force?

Back

The greater the mass of an object, the greater the force needed to move it.