Newton's First Law

Which direction will the object move?

Which direction will the object move?

What kind of forces can change the motion of an object?

If the net force = 0 N, the forces are ____.

If the net force = 0 N, motion ____.

An unbalanced force is needed to make an object ___.

A ball is sitting still on the grass. Gravity is pulling it down, but the normal force is pushing it up, and the net force is 0 N. What will happen to the ball?

A ball is rolling on the grass. The applied force of the kick was 5 N left,

and the force of friction is 5 N right.

What will happen to the ball?

A ball is rolling on the grass. The applied force of the kick was 10 N left, and the force of friction is 5 N right.

What will happen to the ball?

A ball is rolling on the grass. The applied force of the kick was 5 N left, and the force of friction is 10 N right.

What will happen to the ball?

A parachuter is falling through the air. Gravity pulls at 10 N down, but drag pulls at 5 N up.

What will happen?

A parachuter is falling through the air. Gravity pulls at 10 N down, but drag pulls at 10 N up.

What will happen?

A parachuter is falling through the air. Gravity pulls at 10 N down, but drag pulls at 20 N up.

What will happen?

Newton's first law is also called the Law of ___.

___ means an object will keep doing what it was doing.

Because a still object has inertia, we need ____ to make it move.

You are the passenger in a car. When the car stops suddenly, you keep moving forward because of ____.

You are the passenger in a moving car. How did the driver stop the car?

Inertia keeps you moving when the car stops suddenly, unless a ____ provides an unbalanced force to stop your motion.

Which object has more inertia?

Which object has more inertia?

Which object will you need more force to stop?

Which object will you need to push harder to move?