Newton's Laws of Motion

Proposed by the English mathematician, Isaac Newton's Laws of Motion describe how an object would move.

 1) A body at rest remains at rest, and a body in motion remains in motion, unless acted on by an outside force. 2) The change in the motion of a body is in the direction of, and proportional to, the strength of the force applied to it. 3) For every action, there is an equal and opposite reaction.

The first law states that an object will remain stationary unless acted upon. For example, a box will not move by itself, a outside force like a person has to move it. Because there is no air resistance in space, a meteor in space will continue moving with the same velocity until it collides with other matter.

The second law states that an object will continue to move in a straight line until an outside force acts on it to changes its direction. For example, a soccer ball that is kicked in one direction will continue traveling in that direction unless another player kicks it or it collides with a wall. In addition, the amount the object moves is also inversely proportional to its mass. This means that heavier objects will move less than lighter objects when met with same force.

The third law states that for every action, there is an equal and opposite reaction. For example, a rocket blasts off using fuel that combusts into gas, which is directed downward through a noozle, or opening. Because the gases are expelled in a downward direction, by the third law, the rocket must move in an upward direction.