ABOUT NEWTONS THREE LAW'S OF MOTION

2. Newton’s
Laws of Motion

3. Sir Isaac Newton (1643-1727) was an English scientist and
mathematician famous for his discovery of the law of gravity also
discovered the three laws of motion.
He published them in his book “Philosophiae Naturalis Principia
Mathematica”(Mathematic principles of natural philosophy) in
1687.
Today these laws are known as Newton’s Laws of Motion and
describe the motion of all objects on the scale we experience in
our everyday lives.
1642 - 1727

5. Three Laws of Motion
1. Law of
Inertia
2. Law of
Acceleration
3. Law of
Interaction

8.  When a running horse suddenly
stops, the rider falls forward.
 When a horse suddenly starts moving
the rider falls backward.
 We hated carpet with a stick to
remove the dust.
 Athletes run some distance, before
taking a long jumps .
 A man jumping form a moving
train/bus may fall down.

9. The seat belt provides the unbalanced force which
brings you from a state of motion to a state of rest.
Perhaps you could speculate what would occur
when no seat belt is used.
NOTICE : Wear seat belts !!!

10. If the truck were to abruptly stop and the
straps were no longer functioning, then the
ladder in motion would continue in motion.

11. SOME EXAMPLES FROM REAL
LIFE
Two teams are playing tug of war. They are both
exerting equal force on the rope in opposite
directions.
This balanced force results in no change of
motion.
A soccer ball is sitting at rest. It
takes an unbalanced force of a kick
to change its motion.

15. sd
 When catching a ball a cricket player lowers his
hands to save himself from getting hurt.
 Cars, busses, trucks, bogies of the train, etc. are
provided with a spring system to avoid server
jerks.
 Bogies of the train are provided with buffer to
avoid server jerks during shunting of trains.
 A person falling on frozen ice is likely to receive
more injuries than one falling on kuchcha floor.
 China wares are wrapped in straw or paper
before packing.

16. If mass remains constant, doubling the acceleration,
doubles the force. If force remains constant, doubling the
mass, halves the acceleration.
EXAMPLE 1

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17. EXAMPLE 2

18. NEWTONS 3RD LAW
OF MOTION

19. “In every action, there is always an equal and
opposite reaction”

20.  While firing a bullet , the gun must be held
tight to the shoulder.
 When a man jumps from a boat to the shore,
the boat slightly moves away from the
shore.
 When a bullet is fired from a gun, the gun
recalls or gives a kick in backward
direction.
 Rocket works on the principle of
conservation of momentum.
 If some one left on a frictionless floor desire
to get out of it, he can do so by blowing air
out of his mouth.

21. Action: rocket pushes on gases
Reaction: gases push on rocket
EXAMPLE 1

22. Let's study how a rocket works to
understand Newton's Third Law.

23. EXAMPLE 2

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