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I love physics.  I wanted to be a Physicist when I was a child.  A teacher talked me out of it.  What a mistake. 

Assuming you are talking about Newtonian Physics there are three laws of motion:

1.The 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.

2. FORCE = MASS times 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).

3. For every action there is an equal and opposite re-action.

To see illustrations and examples go HERE

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