Invisible Forces Review 2024

Front

What is friction?

Back

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

Front

Why does sandpaper create a lot of friction?

Back

Because it has a rough surface.

Front

What is an example of a push?

Back

Hammering a nail into a piece of wood.

Front

What is an example of a pull?

Back

Pulling a wagon.

Front

Which item is NOT in motion?

Back

A tree stump.

Front

What surface is best for skating?

Back

A smooth sidewalk.

Front

What do suspension bridges use that many other bridges do not?

Back

Cables.

Front

What is gravity?

Back

Gravity is a force that pulls objects toward each other, like the Earth pulling us down.

Front

What is an example of a force?

Back

A push or a pull on an object.

Front

What happens when two objects collide?

Back

They exert forces on each other, which can change their motion.