Laws of Motion-CBSE Class 11 Physics Notes Study Material

What is Inertia?

The property of an object by virtue of which it cannot change its state of uniform motion along a straight line or rest on its own is called as inertia. It is the measure of the mass of a body. There are 3 types of inertia.

• Inertia of rest
• Inertia of motion
• Inertia of direction

What is Force?

A force is a push or pull upon an object resulting from the object’s interaction with another object. Force can be categorized into two types;

• Constant Force
• Action at a distance force

What are Newton’s Laws of Motion?

1. First Law: “A body continues in its state of rest or of uniform motion in a straight line unless it is compelled by some external force to change that state.”
2. Second Law: “The net force produced by an object is directly proportional to the magnitude of the net force and takes place in the direction of the force.”
3. Third Law: “To every action, there is an equal and opposite reaction.”Important Questions

Frequently Asked Questions on CBSE Class 11 Physics Notes Laws of Motion

Q1

What is inertia?

Inertia is a property of matter by which it remains at rest or in motion in the same straight line unless acted upon by some external force.

Q2

What are some of the uses of force in real life?

1. Weight things 2. A force of bat on a ball

Q3

Why is the third law of motion important?

This law is important in analysing problems of static equilibrium, where all forces are balanced.

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