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General Physics

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 Joined: 21 Apr 2011 Post: 1
21 Apr 2011 18:57:37 IST
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whats newtons law of motion
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whats newtons law of motion

Hot goIITian

Joined: 13 Jun 2010
Posts: 114
21 Apr 2011 19:46:54 IST
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hey man just refer to ncert book for this......

Blazing goIITian

Joined: 1 Apr 2007
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22 Apr 2011 18:33:40 IST
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Newton's laws of motion are three physical laws that form the basis for classical mechanics. They describe the relationship between the forces acting on a body and its motion due to those forces. They have been expressed in several different ways over nearly three centuries, and can be summarized as follows:

1. First law: Every body remains in a state of constant velocity unless acted upon by an external unbalanced force. This means that in the absence of a non-zero net force, the center of mass of a body either remains at rest, or moves at a constant velocity.
2. Second law: A body of mass m subject to a net force F undergoes an acceleration a that has the same direction as the force and a magnitude that is directly proportional to the force and inversely proportional to the mass, i.e., F = ma. Alternatively, the total force applied on a body is equal to the time derivative of linear momentum of the body.
3. Third law: The mutual forces of action and reaction between two bodies are equal, opposite and collinear. This means that whenever a first body exerts a force F on a second body, the second body exerts a force −F on the first body. F and −F are equal in magnitude and opposite in direction. This law is sometimes referred to as the action-reaction law, with F called the "action" and −F the "reaction". The action and the reaction are simultaneous.

Scorching goIITian

Joined: 12 Apr 2011
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22 Apr 2011 18:36:12 IST
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First law about the inebility of Matter to change its state (of Rest, motion and DIRECTION) INERTIA:

Every body continues in its state of REST or constant velocity in a STRIGHT LINE unless acted  by an external  force. No particle can change its direction of motion by itself.

Second law: tells about the quantity of acceleration produced by the force

F = ma.

Third Law tells about the Action and Reaction

That is About the give and take philosophy of the Ultimate NATURE !

WE CAN NOT LIFT OUR SELVES, When we apply force on water,  water helps us move forward. We call this  swimming. Only external force can work creatively. Pushing a car to move. Internal force destructive? Bomb!

For every action there is an equal RE action

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