NEWTON’S LAWS OF MOTION

### NEWTON’S FIRST LAW

It states that everybody continues in its state of rest or in uniform motion in a straight line, unless it is compelled by an external force to change that state.
First law is also called law of Galileo or law of inertia.

#### APPLICATIONS

Athlete runs some distance, before taking a long jump.
A ball thrown upwards in a train moving with uniform velocity returns to the hand of thrower.
The mud from the wheels of a moving vehicle flies-off tangentially.
When we shake the branch of a mango tree, the mangoes fall down.
A man jumping from a moving train may fall down.
If a cloth placed under a book is given a sudden pull, it comes out without disturbing the book.
When a horse suddenly starts moving, the rider falls backward.
We hit a carpet with a stick to remove the dust.

### NEWTON’S SECOND LAW

According to it, the force acting on an object is directly proportional to the product of the mass of the object and the acceleration produced on it.

or               F∝m✕a⇒F=kma

value of k is 1 in SI system ⇒F=ma It’s SI unit is newton.
Newton’s second law gives the magnitude of force.
Newton’s first law is contained in the second law.

#### APPLICATIONS

China wares are wrapped in straw or  paper before packing.
A person falling on pucca floor (or frozen ice) is likely to receive more injuries than one falling on kuccha floor (loose earth).
While catching a ball, a cricket player lowers his hands to save himself from getting hurt.
Bogies of the trains are provided with buffers to avoid severe jerks during shunting of trains.

### NEWTON’S THIRD LAW

According to this law, to every action there is an equal and opposite reaction.

#### APPLICATIONS

In order to walk,we press the ground in backward direction with our feet.As a result, the earth on other hand pushes us in forward direction.
It is difficult to drive a nail into a wooden block without holding the block.A jet plane moves on the principle of Newton’s third law of motion.As exhaust gases come out from the nozzle at a greater speed, the reaction of the same moves the plane forwards.

NEWTON’S LAWS OF MOTION