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15 Mar 2010 12:20:05 IST

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newton's third law

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newton's third law

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SUNIL KHORWAL

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Joined: 23 Feb 2010

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15 Mar 2010 12:36:34 IST

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A force is a push or a pull upon an object which results from its interaction with another object. Forces result from interactions! As discussed in some forces result from contact interactions (normal, frictional, tensional, and applied forces are examples of contact forces) and other forces are the result of action-at-a-distance interactions (gravitational, electrical, and magnetic forces). According to Newton, whenever objects A and B interact with each other, they exert forces upon each other. When you sit in your chair, your body exerts a downward force on the chair and the chair exerts an upward force on your body. There are two forces resulting from this interaction - a force on the chair and a force on your body. These two forces are called action and reaction forces and are the subject of Newton's third law of motion. Formally stated, Newton's third law is:

For every action, there is an equal and opposite reaction.

ThIrStY of IIT

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15 Mar 2010 12:41:28 IST

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Consider two bodies A and B, thenThe force exerted by a body A is equal and opposite to the force exerted by body B.[or]Whenever two bodies or in contact , the two forces that they exert on each other are always equal in magnitude and opposite in direction.mathematically; F {A on B} = - F{B on A}

Sagar Saxena

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16 Mar 2010 14:19:21 IST

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hii

The third law of motion states that if a body exerts a force on a second body, the second body

exerts a force that is equal in magnitude and opposite in direction to the first force. So for every

action force there is always a reaction force. No force can occur by itself

The book lying on the table is exerting a downward force on the table, while the table is exerting an

upward reaction force on the book. Because the forces are equal and opposite, the book remains at rest.

Notice also that the table legs are in contact with the floor and exert a force downward on it, while the floor

in turn exerts an equal and opposite force upward.

Figure showing a book on a table and the force pairs on thebook and the legs.

!!!!!

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