APPLICATION OF
LAWS OF MOTION
ANURAG KOLE
11-D

NEWTONS LAWS OF MOTION
1. Newtons first law of motion states that, “Every object will remain at rest or in
uniform motion in a straight line unless compelled to change its state by the action of
an external force.”
2. Newtons second law of motion states that, “Force is equal to the rate of change of
momentum.”
3. Newtons third law of motion states that, “Every action has an equal and opposite
reaction.”

WHY LAWS OF MOTION?
We use the concepts of laws of motion to explain the way macroscopic objects
interact and influence the motion of each other. It is a good approximation for replicating
most circumstances in our physical world. Newtons Laws of Motion is base on three laws
given by Newton. It is used to describe the motion of the Centre of Mass of a object.
(Along with Rotational Mechanics it can describe a lot of motions, both translatory and
rotational)

APPLICATION:

1ST LAW OF MOTION
An object which is initially in rest or uniform motion will continue to do so unless an
external unbalanced force is applied. Say a boat is floating stationary in a sea. The wind
catches the sail and applies a force on the boat. This causes the boat to start moving.
The boat is stationed The boat starts moving

The Sun pulls the Earth with its
gravitational force, thus changing
the direction of Earth so, Earth
does not fly off into space
Α moving ball hits a wall, which applies a
force on the ball, stopping i t

ACCELERATION AND FORCE
The faster the wind blows, the faster the sailboat will start sail. This implies that the rate
at which velocity increases is proportional to the magnitude of force applied. This rate of
change of velocity is termed as acceleration.
Thus, acceleration ∝ force

ACCELERATION AND MASS
On the other hand, in the same wind, a lighter sailboat will start to move faster than a
heavy sailboat. This implies that the same force can accelerate a lighter body much more
than it can accelerate a heavier body. Acceleration is inversely proportional to mass of the
body
Thus, acceleration ∝ 1/mass

3RD LAW OF MOTION:
Every action has an equal and opposite reaction. Take a wheel for example. The wheel
rotates and apples a force on the ground. Due to this, the ground also applies an equal
force to the wheel, which pushes it forward. Its because of this that when an object strikes
another, both start moving in opposite directions regardless if it was stationary or
moving.

THANK YOU
THIS IS THE END OF THE PRESENTATION