# Newtons Three Laws

## Newtons 1st law

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.

## Ex. 1

If you slide a hockey puck on the ice, eventually it will stop, because the friction on the ice. It will also stop if it hits something like a goalpost.

## Ex. 2

If you are driving in a car at a very high speed and hit a tree the car will instantly stop but you will continue going until the force of your seatbelt holds you back.

## Newtons 2nd law

The second law states that the acceleration of an object is dependent upon two variables - the net force acting upon the object and the mass of the object.

Formula: F=ma

## Ex. 1

If you push a truck and a car with the same amount of force the car will have a higher acceleration because it has less mass.

## Ex. 2

It's easier to push the cart at the beginning of your shopping trip than at the end because the cart in the beginning has less mass because their is less stuff.

## Newtons 3rd law

For every action, there is an equal and opposite reaction.

## Ex. 1

When rowing a boat your going forward because the force pushing backward in the water moves you forward.

## Ex. 2

When you dive off a diving board, you push down on the springboard. The springboard pushes back up and you fly into the air.