Uniform
When an object covers equal distance in equal interval of time, no matter how small these time intervals are, then the motion is called uniform motion. For example consider an object moving along a straight line. Let it travel 50 km in the first hour, 50 km more in the second hour, 50 km in the third hour and 50 km in the fourth hour. In this case, the object covers 50 km in each hour. As the object covers equal distances in equal intervals of time, it is said to be in uniform motion. The time interval in this motion may be small or big.
Non-uniform Motion
When an object covers unequal distance in equal interval of time, no matter how small these time intervals are, then the motion is called non-uniform motion. For example consider an object moving along a straight line. Let it travel 30 km in the first hour, 50 km more in the second hour, 40 km in the third hour and 50 km in the fourth hour. In this case, the object covers different distances in each hour. As the object covers unequal distances in equal intervals of time, it is said to be in non-uniform motion. The time interval in this motion may be small or big.
In our day-to-day life, we come across motions where objects cover unequal distances in equal intervals of time, for example, when a car is moving on a crowded street or a person is jogging in a park. These are some instances of non-uniform motion.
Another example of uniform and non-uniform is shown in figure --
Non-uniform motion is of two types:
1. Accelerated Motion: When motion of a body increases with time.
2. De-accelerated Motion: When motion of a body decreases with time.