Newton's First Law

Front

What is Newton's First Law of Motion?

Back

An object at rest remains at rest, or if in motion, remains in motion at a constant velocity unless acted on by a net external force.

Front

What does it mean if an object is stationary?

Back

The object is not in motion.

Front

How does Newton's First Law apply to starting a skateboard?

Back

The skateboard won’t move unless you push off from the pavement with one foot. The force you apply when you push off is stronger than the force of friction that opposes the skateboard’s motion, resulting in unbalanced forces that cause the skateboard to move forward.

Front

What is the term for the tendency of an object to resist changes in its motion?

Back

Inertia.

Front

What is friction?

Back

Friction is a force that counters all kinds of motion and occurs whenever two surfaces come into contact.

Front

What happens to an object in motion if no net external force acts on it?

Back

It continues to move at a constant velocity.

Front

What is an example of inertia in everyday life?

Back

A passenger in a car lurches forward when the car suddenly stops.

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 net external force?

Back

A net external force is the overall force acting on an object when all individual forces are combined.

Front

How does friction affect motion?

Back

Friction opposes the motion of an object, making it harder to start or stop moving.