Front

What is gravity?

Back

Gravity is a force that pulls objects toward each other. It is what keeps us on the ground and causes objects to fall.

Front

What is friction?

Back

Friction is a force that opposes the motion of an object. It occurs when two surfaces rub against each other.

Front

What are the three types of friction?

Back

The three types of friction are static friction, sliding friction, and rolling friction.

Front

What is static friction?

Back

Static friction is the force that keeps an object at rest and prevents it from moving.

Front

What is sliding friction?

Back

Sliding friction is the force that opposes the motion of an object that is sliding over a surface.

Front

What is rolling friction?

Back

Rolling friction is the force that opposes the motion of an object that is rolling over a surface.

Front

What is mass?

Back

Mass is a measure of how much matter (particles) an object has.

Front

What is weight?

Back

Weight is the force of gravity acting on an object's mass.

Front

What is density?

Back

Density is the mass of an object divided by its volume. It tells us how much matter is packed into a certain space.

Front

Which has more gravity: the Earth or the Moon?

Back

The Earth has more gravity than the Moon because it is larger and has more mass.