Oscillatory motion is the type of motion in which an object moves to and fro about a fixed point. The swinging of a pendulum is an example of oscillatory motion.
 

1. When a body moves in a circular path with respect to time, it is known as circular motion. e.g. the tip of minute hand.


2. When a body moves in a straight line with respect to time, it is known as linear motion. e.g the stone falling from a height.


3. When a body moves about its own axis, it is known as rotational motion. e.g. the wheel of the sewing machine.

Definition: 1 Mark
Translational motion is the motion of body where body moves in the linear path. It is the motion in which all points of a moving body move uniformly in the same line or direction.

Definition: 1 Mark
Unit: 1 Mark
The average speed of a moving object is defined as the total distance covered by it divided by the total time taken.
$Averagespeed=\frac{Totaldistancecovered}{TotalTime}$
The S.I unit of speed is meter per second. Speed is also measured in kilometre per hour.

Condition for uniform motion: 1 Mark
Answer: 1 Mark
Speed1 $=\frac{3}{10}=0.3km/min$
Speed2 $=\frac{6}{30}=0.2km/min$
Speed3 $=\frac{10}{60}=0.166km/min$
When a body is in a uniform motion, it covers equal distance in equal intervals of time.
In the above question, speed in all the three cases is different. Hence, it is not a uniform motion.

Sub-parts: 1 Mark each
(i) Seconds in a day $=60\times 60\times 24=86400seconds$
(ii) Minutes in a week $=60\times 24\times 7=10080minutes$
(iii) Hours in a year $=24\times 365=8760hours$