Newton's 3 Laws of Motion
Law of Inertia:
An object at rest will remain at rest unless acted on by an unbalanced force. An object in motion continues in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
Object that is still will stay still unless something pushes it
The ball is rolling and will do so until the dog catches it
I could roll a ball and have someone put their hand in front of the ball
Law of Acceleration
Acceleration is produced when a force acts on a mass. The greater the mass (of the object being accelerated) the greater the amount of force needed (to accelerate the object).
Big objects are harder to move
The ball is small so it is easier to throw and goes faster
I could roll a pencil and then a marker
Law of Reactions
For every action there is an equal and opposite re-action.
If you punch a wall the wall is pushing back against your fist
The man is punched but the gloves protect from the force of the blow
I could roll a marker into another marker