# 7th Class Science Motion Classification of Motion

## Classification of Motion

Category : 7th Class

### Classification of Motion

Motion, on the basis of covered distance has been classified into two groups.

Uniform Motion (Uniform = Alike)

If a body covers equal distances in equal interval of time, the body is said to be in the uniform motion. (Interval of time: Time duration or time difference)

In the above picture, speed of the car is constant at different interval of time. Therefore, it covers equal distances in equal interval of time. Thus the above shown car is in uniform motion.

Graphical Representation of the Uniform Motion

The above graph shows that the body covers the distance 20 m in every 5 minute. It means, the body covers equal distances in equal interval of time, therefore, the body is in uniform motion.

Note: If motion of a body, on a distance time-graph, represents a straight line, it means the body is in uniform motion.

Non-Uniform Motion

There are two conditions for a motion to be non- uniform:

When a body covers unequal distances in equal interval of time.

When a body covers equal distances in unequal interval of time.

In the above picture, speed of the car varies at different interval of time. Therefore, it covers unequal distances in equal interval of time. Thus the above shown car is in non-uniform motion.

Graphical Representation of the Non-Uniform Motion

The above graph shows, the body covers 20 meter in first 5 minute, 25 meter in next 5 minute, 15 meter in next 5 minute, and 20 meter in the last 5 minute. It means the body covers unequal distances in ‘equal interval of time. Thus the body is in non-uniform motion.

Note: If motion of a body, on a distance time-graph, represents a curved line, it means the body has non-uniform motion

Questions 1 and 2 are based on the following graph

Graphical representation of motion of two different body has been shown in the above graph. Both the body are in.........

(a) Uniform motion

(b) Non-uniform motion

(c) Periodic motion

(d) Circular motion

(e) None of these

Look at the above graph carefully and choose which one of the following bodies have greater speed?

(a) Body A

(b) Body B

(c) Both the body have equal speed

(d) All of these

(e) None of these