# Newtons Laws of physics

## Law one

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

For example, a ball sitting on a completely flat surface will stay sitting there unless a person acted on it, pushing it. It would stay moving unless an outside force acted on it.

## Law two

Law two states that force is equal to mass times acceleration, so F=MxA.

The way an object moves is related to it's mass, if a toy car has little mass it would be easier to push. The mass of a real car has a lot more mass and therefor harder to push.

Acceleration is the change of an objects velocity during a given amount of time.

So how much force you would need to apply to the car is equal to if you did the cars mass, times it's acceleration.

m=42kg

a=31 m/s2

F=546 kg

## Third Law

Law three states that an every action has it's equal opposite reaction.

According to this law, everything in nature always acts in pairs.

Take a frog leaping off a lillypad. The frog applies force down onto the lilly pad to jump and therefore pushes it down, pushing the frog upwards.

Or a helicopter lifting off, the air pushed down from the blades bounces off the ground and helps to push the helicopter upwards.