Question

Explain the first law of motion

Answer 1

Newton's first law of motion :

An object at rest remains at rest, or if in motion, remains in motion at a constant velocity unless acted on by a net external force.

Explanation :

In Newton's first law of motion, we understand that if an object is at rest, it will remain at rest, unless any external force is applied to change its state. Also an object will keep moving at a constant velocity, unless any external force is acted on to change its state of motion.

Example :

Assume a stone is rolling down a hill. It will keep rolling down if external forces, like friction be not there.

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Answer 2

Newton's First law of motion is also called as law of Inertia.

It states that " every object which is at rest  or uniform motion  continues to be at the state of rest or in uniform motion unless it is compelled to change its state by action external net force."

Example :

1. When a driver applies a sudden break to a moving bus, the passenger tries to lean forward

explanation :

• When bus is in motion, Passenger is also in the state of motion.
• When driver applies sudden break, passenger leans forward because his legs which are in contact with bus comes to rest immediately but his upper part of body tries to be in motion  due to inertia of motion .

• Hence due to inertia of motion, he leans forward.