ppt

1. NEWTON’S LAWSNEWTON’S LAWS
OF MOTIONOF MOTION
NIMISHA S.NIMISHA S.
Physical SciencePhysical Science
Reg No. 18214304010Reg No. 18214304010
N.S.S TRAINING COLLEGE
PANDALAM
2014-2015

2. Everybody continues in its state of restEverybody continues in its state of rest
or of uniform motion along a straight lineor of uniform motion along a straight line
until it is acted up on by an externaluntil it is acted up on by an external
unbalanced force.unbalanced force.
FIRST LAW OF MOTION

3. DEFINITION FOR INERTIAANDDEFINITION FOR INERTIAAND
FORCE FROM THE FIRST LAWFORCE FROM THE FIRST LAW
Inertia is the tendency of a body toInertia is the tendency of a body to
continue in its state of rest or the state ofcontinue in its state of rest or the state of
uniform motion along a straight line.uniform motion along a straight line.
INERTIA

4. The rate of change of momentum of aThe rate of change of momentum of a
body is directly proportional to thebody is directly proportional to the
unbalanced external force acting of theunbalanced external force acting of the
body and it takes place in the direction 0fbody and it takes place in the direction 0f
the force.the force.
SECOND LAW OF MOTION

5. The rate of change of momentum isThe rate of change of momentum is
m(v-u)m(v-u)
tt
If F is the unbalanced forceIf F is the unbalanced force
FF αα m (v-u)m (v-u)
tt
F = K m (v-u) ; K is a constantF = K m (v-u) ; K is a constant
tt
Since v-u = a ; the accelerationSince v-u = a ; the acceleration
tt
∴∴F = maF = ma
The unit of force is kgm/sThe unit of force is kgm/s22
or Newton (N)or Newton (N)
The Equation for force from
Second Law

6. Every action has an equalEvery action has an equal
and opposite reaction.and opposite reaction.
THIRD LAW OF MOTION

7. Every action has an equalEvery action has an equal
and opposite reaction.and opposite reaction.
THIRD LAW OF MOTION