### Table of Contents

Definition

**Rest: **

A body is said to be at rest if it does not change its position concerning its surroundings.

Definition

**Motion: **

A body is said to be in motion if it changes its position concerning its surroundings.

Definition

**Scalars**

Physical quantities which are described by their magnitude only are known as scalars.

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Definition

**Vectors: **

Physical quantities which are described by their magnitude and direction are known as vectors.

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Definition

**Uniform speed: **

If the speed of a body does not change with time then its speed is uniform.

Definition

**Average speed: **

Average speed of a body is the ratio of the total distance covered to the total time taken

Definition

**Velocity: **

We define velocity as the rate of change of displacement or speed in a specific direction.

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Definition

**Average velocity:**

The average velocity of a body is defined as the ratio of its net displacement to the total time.

Definition

**Uniform velocity: **

If a body covers equal displacements in equal intervals of time, however small the interval may be, then its velocity is said to be uniform.

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Definition

**Uniform acceleration: **

A body has uniform acceleration if it has equal chances in its velocity in equal intervals of time, however small the interval may be.

Definition

**Graph: **

The graph is a pictorial way of describing information as to how various quantities are related to each other.

Definition

**Distance-time graph: **

Distance-time graphs provide useful information about the motion of an object. The slope of the displacement-time graph gives the velocity of the body.

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Definition

**Speed - time graph: **

Speed-time graph is also useful for studying motion along a straight line.

Definition

**Velocity - time graph: **

The distance traveled by a body can also be found from the area under the the Velocity-time graph if the motion is along a straight line.

Definition

**Acceleration due to gravity: **

When a boy is dropped freely he falls with an acceleration towards the earth. This acceleration is called acceleration due to gravity and is denoted by g. the numerical value of g is approximately 10 ms^{-2} near the surface of the Earth.

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