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:
- 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.
- 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.
- 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.
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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