Force and Motion

Front

What is force?

Back

A push or pull on an object that can cause it to move, stop, or change direction.

Front

What is motion?

Back

The change in position of an object over time.

Front

What is friction?

Back

A force that opposes the motion of an object, caused by the contact between two surfaces.

Front

What is gravity?

Back

A force that pulls objects toward each other, such as the pull of the Earth on objects.

Front

What is mass?

Back

The amount of matter in an object, usually measured in kilograms.

Front

How does mass affect force?

Back

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

Front

What happens to the speed of a ball thrown straight up?

Back

It goes slower and slower as it goes up, stops, and then goes faster and faster as it comes down.

Front

What is the effect of increased friction on a moving object?

Back

It causes the object to slow down.

Front

What is the relationship between gravity and falling objects?

Back

Gravity pulls objects down toward the Earth.

Front

What is an example of a force acting on a skydiver?

Back

Gravity pulls her down and friction from the air slows her fall.