This document summarizes Newton's three laws of motion. Newton's first law states that an object at rest stays at rest and an object in motion stays in motion with the same speed and direction unless acted upon by an unbalanced force. Newton's second law states that the acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object. Newton's third law states that for every action, there is an equal and opposite reaction. Examples of this include the forces exerted on a bird by its wings and the recoil of a gun.

1. Newton's Laws of Motion
Made by :
Nitin
Chhaperwal

2. Index
Objectives
Force
Newton’s first law
Inertia
Newton’s second law
Newton’s third law
End!

3. Objectives
Understand the ideas of motion and force
Describe Newton's three laws of motion
Understand the idea of inertia
Test Newton's three laws of motion in
their class room

4. WHEN THERE IS A PULL ...
WHEN THERE IS A PUSH...
WHEN THERE IS A STRETCH...
WHEN THERE IS A SQUEEZE ...
WHEN THERE IS A TWIST...
We experiences some effect called forces.
We can’t see forces but we can see the effect of a
force.
Force

5. The ball remains in its state of rest till an external
force is acting on it.
Newton’s first law

6. When an external force (push) is acting on a ball (object)
at rest it changes its state (moves over the steps ).
Newton’s first law (contd..)
Push the ball

7. object in motion tends to stay in motion
Newton’s first law (contd..)

8. When external force (Push of the rabbit)
acting on the object (ball) which is in
motion the object changes its position.
Newton’s first law (contd..)
Push the ball

9. From the above observation...
Newton’s first law (contd..)
An object remains in its state of rest
if no external force is acting on it.
An object remains in its state of motion
if no external force is acting on it.
An object changes its state of rest or uniform
motion if some external force acting on it.

10. An object at rest tends to stay at rest and an object in
motion tends to stay in motion with the same speed and
in the same direction unless an external force is acting
on it.
The above three statement can be written as a single
statement which is the Newton’s first law
In other words
Every body continuous in its state of rest or in uniform
motion Unless an external force is acting on it.
Newton’s first law (contd..)

11. When the car hits the wall……
The moving car stopped when a force (from the
wall) is acting on it.
Driver who is moving along with the car could not
able to stop himself when the car stopped.
Driver has inability to change his position by
himself at that instant.
Inertia

12. When the truck hits the car……
The moving truck stopped when a force (from the car) is
acting on it.
Ladder which is moving along with the truck could not able
to stop itself when the truck stopped.
Ladder has inability to change its position by itself at that
instant
Inertia (contd..)

13. It is the natural tendency of objects to resist changes in
their state of motion.
This tendency to resist changes in their state of motion is
described as inertia.
This can be said in a single statement
Inability of an object to change its position by itself
is called Inertia.
Inertia (contd..)

14. It is too hard
It is very easy
Smaller force is needed to move smaller mass
Larger force is needed to move larger mass
Newton’s second law

15. 10 n
30 n
Smaller force give smaller acceleration
Larger force give Larger acceleration
Newton’s second law (contd..)

16. If a bowling ball and a soccer ball were both dropped at the same time from the roof of a tall building, which
would hit the ground with a greater force?
Acceleration due to gravity accelerates downwards all objects at the same rate.
Therefore the difference in forces would be caused by the different masses of the balls.
The mass of the bowling ball is greater than the mass of the soccer ball.
The bowling ball experience greater force than soccer ball.
So, bowling ball hit the ground first.
Newton’s second law (contd..)

17. Smaller force (F) is needed to move smaller mass (m)
Larger force (F) is needed to move larger mass (m)
So, Force is directly proportional to mass
F α m
Smaller force (F) give smaller acceleration (a).
Larger force (F) give smaller acceleration (a).
So, Force is directly proportional to acceleration (a).
F α a
Acceleration is produced when a force acts on a mass.
The greater the mass (of the object being accelerated) the greater the amount of force needed (to
accelerate the object).
Newton’s second law states that the net force on an
object is proportional to the mass and the acceleration
that the object undergoes.
F = ma
Newton’s second law (contd..)

18. Look at the flying motion of birds.
A bird flies by the use of its wings.
The wings of a bird push air downwards.
The air reacts by pushing the bird upwards.
The direction of the force on the air
(downwards) is opposite to the direction of the
force on the bird (upwards).
These two forces are equal and opposite.
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Newton’s third law

19. Look at the flying motion of rocket.
Hot gases are pushed out from the bottom of
the rocket as the rocket is thrust upward.
The force of the gases pushing against the
surface of the earth is equal and opposite to
the force with which the rocket moves
upward.
These two forces are equal and opposite.
Newton’s third law (contd..)

20. Look at the recoil effect of the gun.
When we trigger the gun, the gun pushes the
bullet forwards and the bullet pushes the gun
backwards.
The bullet has a greater acceleration due to the
fact that it has a smaller mass. (Newton's
second law)
These two forces are equal and opposite.
action
reaction
Trigger the gun
Newton’s third law (contd..)

21. Summary

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