LAWS OF MOTION

LAWS OF MOTION -

FORCE-
 Force is defined as a push or pull which changes the state of rest.

E.G-
1. Force can change speed of an object.
2. Force can change the direction of motion of object.
3.force can change the shape of object.

INERTIA-
 The inherent property of a material body by virtue of which it cannot change, by itself , its state of rest or of uniform motion in a Straight line is called inertia.

DIFFERENT TYPES OF INERTIA-
1. INERTIA OF REST-
         The tendency of a body to remain in its position of rest is called inertia of rest.

2.INERTIA OF MOTION-
        The tendency of a body to remain in its state of uniform motion in a straight line is called inertia of motion.

3.INERTIA OF DIRECTION-
        The inability of a body to change by itself its direction of motion is called inertia of direction.

LINEAR MOMENTUM-

        Momentum is equal to product of mass and velocity of the body.

           P=MV

where P= momentum of body
           V= velocity of body
*It is a vector quantity.

UNIT-
  P= MV = Kg m/s  (S.I)
  P= MV = gcm/s

DIMENSION- P=MV= [M L T-1]

NEWTON'S LAWS OF MOTION-

FIRST LAW-

Every body continues in its state of rest or of uniform motion in a state of rest or of uniform motion in a straight line unless it is compelled by some external force to change that state.

SECOND LAW-
The rate of change of linear momentum of a body is directly proportional to the applied force and the change takes place in the direction of applied force.

THIRD LAW-
To every action,there is always an equal and opposite reaction.

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LAWS OF MOTION

                                        FORCE= MASS X ACCELERATION

UNITS-

FORCE= NEWTON (S.I.)

FORCE= DYNE (C.G.S)

RELATION BETWEEN NEWTON AND DYNE-

                                           1 NEWTON=100000 DYNE

According to Newton's second law,

    

                                           F=dp/dt

IMPULSE-

It is defined as the product of the force and the time for which it acts and is equal to the change in momentum.

                               IMPULSE= FORCE X TIME DURATION= TOTAL CHANGE IN                                                                                                                                    MOMENTUM

*Impulse is a vector quantity.

UNITS-

Impulse=Kg m/s (s.i)

Impulse=g cm/s (c.g.s)