1.2 Newton's First Law Review

Front

What is Newton's First Law of Motion?

Back

An object at rest stays at rest, and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

Front

What is inertia?

Back

The tendency of an object to resist a change in its state of motion.

Front

What force causes objects that are moving to come to a stop?

Back

Friction.

Front

If the forces acting on an object are balanced, what happens to its motion?

Back

Its motion will not change.

Front

What happens to a moving object when no unbalanced force acts on it?

Back

It continues moving in the same direction and at the same speed.

Front

What is an example of inertia in everyday life?

Back

A crash test dummy flying forward when the car crashes.

Front

What is the relationship between mass and inertia?

Back

The greater the mass of an object, the greater its inertia.

Front

What is a balanced force?

Back

Forces that are equal in size but opposite in direction, resulting in no change in motion.

Front

What is an unbalanced force?

Back

Forces that are not equal and opposite, causing a change in motion.

Front

How does friction affect motion?

Back

Friction opposes the motion of objects, causing them to slow down or stop.