Differentiate between the following.

1. Rectilinear motion and curvilinear motion
2. Rotational motion and circular motion
3. Periodic motion and random motion

1. When an object moves in a straight line, then it is said to be in a rectilinear motion.

1. When an object moves along a curved path, then it is said to be in a curvilinear motion.

2. Example: A bus moving on a straight road.

2. Example: A bus taking a turn.

1. It is the motion in which a body rotates on its own axis.

1. It is the motion in which a body just moves in a circle and always has a starting point to which it will eventually return. 

2. Example- Moving of earth on its own axis, Spinning top.

2. Example: Motion of the earth around the sun in a circular orbit, the motion of a bike along a curved path.

1. It is a motion that repeats itself at regular periods of time.

1. It is a motion that does not repeat itself at regular periods of time.

2. Example- Movement of earth, A pendulum clock.

2. Example: The motion of insects and birds.