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  1LAW - Every body continues to remain in it's state of rest or uniform motion along a straight line,unless compelled by an external force to change that state.

2LAW - De rate of change of acceleration of the body is directly proportional to the force acting on it, and takes place in de direction of force.

3 LAW - For every action their is an opposite and equal reaction.

Newton's Three Laws
of Motion

Let us begin our explanation of how Newton changed our understanding of the Universe by enumerating his Three Laws of Motion.

Newton's First Law of Motion:

This we recognize as essentially Galileo's concept of inertia, and this is often termed simply the "Law of Inertia".

Newton's Second Law of Motion:

This is the most powerful of Newton's three Laws, because it allows quantitative calculations of dynamics: how do velocities change when forces are applied. Notice the fundamental difference between Newton's 2nd Law and the dynamics of Aristotle: according to Newton, a force causes only a change in velocity (an acceleration); it does not maintain the velocity as Aristotle held.

This is sometimes summarized by saying that under Newton, F = ma, but under Aristotle F = mv, where v is the velocity. Thus, according to Aristotle there is only a velocity if there is a force, but according to Newton an object with a certain velocity maintains that velocity unless a force acts on it to cause an acceleration (that is, a change in the velocity). As we have noted earlier in conjunction with the discussion of Galileo, Aristotle's view seems to be more in accord with common sense, but that is because of a failure to appreciate the role played by frictional forces. Once account is taken of all forces acting in a given situation it is the dynamics of Galileo and Newton, not of Aristotle, that are found to be in accord with the observations.

Newton's Third Law of Motion:

This law is exemplified by what happens if we step off a boat onto the bank of a lake: as we move in the direction of the shore, the boat tends to move in the opposite direction (leaving us facedown in the water, if we aren't careful!).

Newton's Laws of Motion

1. A body at rest will remain at rest, and one in motion will remain in motion, until and unless acted upon by an external unbalanced force. (Law of inertia)
2. The rate of change of momentum, acceleration (a), of a body (m), is proportional to the resultant force (F) acting on the body in the same direction as the resultant force. (F = ma)
3. For every action there is an equal and opposite reaction.