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2014-09-19T19:16:29+05:30

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1st law

If there is no net external force (push or pull in any direction), then every thing stays as it is. It continues to stay at rest, if it is at rest.  It continues to move with the same speed if it is moving.

An object continues to be in the state of inertia of rest or uniform motion in one direction if no net resultant external force is acting on it.

Inertia is related to mass - amount of substance itself. It is the property that an object does not change its state unless it is forced externally.

If I put a book on a table. the net force acting on it is 0. so it stays there at rest, as it is. A skating person on ice, moves forward with same speed. Of course he/she does not push against the ice, or shift the position or posture.

2nd law

The rate of change of momentum is equal to the net , unbalanced or resultant force acting on a body.  OR, the force acting on a body is equal to the product of its mass and acceleration.

Momentum : it is the product of mass and velocity of the body. It gives the total amount of velocity in the total body. It gives the total impact the body will have if it collides with another object. It is also related to the amount of force required to stop the body. If one with higher momentum collides with another, one is hurt more.
  Force is a vector

3rd law

If a body1 exerts a force F1 on another body2, then the body to exerts a force - F2 on body1 in the opposite direction.

If two magnets are kept near each other with the north poles facing, magnet1 exerts a force F1 on magnet2 and magnet 2 exerts a force = -F1 on magnet1. Magnet 1 moves backwards and magnet2 also move backwards. If you hold one in each hand, then you can experience that.

Two wrestlers exert force F on each other through the hands. Each wrestler is pushed backwards with force - F. But they remain stationary for some time.  How? A wrestler pushes the ground with force -F. The floor pushes him forward with force F. The forces on the wrestler balance and he remains stationary.

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2014-09-20T13:51:48+05:30
the 3 laws of motion are
1.every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it.
2.the relation between an objects mass m, its acceleration a,  and the applied force F is F= ma .acceleration and force are vectors.in this law the direction of force vector is the same as the direction of acceleration vector.
3. for every action there is an equal and opposite reaction
hope I helped u!!!!!!
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