### Table of Contents

Definition

**Inertia**

The inertia of a body is its property due to which it resists any change in its state of rest or uniform motion in a straight line.

Definition

**Momentum:**

The body's momentum is the quantity of motion possessed by the body. The momentum of a body is equal to the product of its mass and velocity.

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Definition

**Newton's first law of motion: **

Newton's first law of motion states that a body continues its state of rest or uniform motion in a straight line provided no net force acts on it.

Definition

**Newton's first law of motion: **

Newton's first law of motion states that a body continues its state of rest or uniform motion in a straight line provided no net force acts on it.

Definition

**Unit of Force: **

SI unit of force is newton (N). It is defined as the force which produces an acceleration of 1 $ms^{-2}$^{ }in a body of mass 1 kg

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Definition

**Mass: **

The mass of a body is the quantity of matter possessed by it. It is a scalar quantity. SI unit of mass is the kilogram (kg).

Definition

**Weight: **

The weight of a body is the force of gravity acting on it. It is a vector quantity. SI unit of weight is Newton (N).

Definition

**Newton's third law of motion: **

Newton's third law of motion states that to every action there is always an equal and opposite reaction.

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Definition

**Law of conservation of momentum: **

The Law of conservation of momentum states that the momentum of an isolated system of two or more two interacting bodies remains constant.

Definition

**Rolling Friction: **

Rolling friction is the force of friction between a rolling body and a surface over which it rolls. Rolling friction is lesser than the sliding friction.

Definition

**Circular motion: **

The motion of a body moving along a circular path is called circular motion.

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Definition

**Centripetal force: **

The force which keeps the body moving in a circular path is called the centripetal force and is given by:

$F_{c}=\frac{mv^{2}}{r}$

Definition

**Centrifugal force: **

According to Newton's third law of motion, there exists a reaction to the centripetal force. The centripetal reaction that pulls the string outward is sometimes called the centrifugal force.

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