Inertia in rest, motion and direction definition with example
Answers
What is inertia?
Inertia is the inability of a body to change its state of rest or of uniform motion along a straight line by itself.
To change the state of rest or of uniform motion in a straight line of a body, we have to apply an external unbalanced force on it. The body experiences an inability to change the state by itself, and it tends to remain in that state.
Well, there are 3 kinds of inertia.
(1) Inertia Of Rest
It is the resistance of a body to change its state of rest by itself. A familiar example is given below.
When a bus in rest suddenly starts, the passengers in the bus will fall backward. This is because, the lower part of the body of the passengers, which is in contact with the bus, will be in motion, but the upper part tends to remain in rest.
(2) Inertia Of Motion
It is the resistance of a body to change its state of motion by itself. That's why the passengers in the bus will fall forward when a bus in rest suddenly stops, because the lower part of the body of the passengers will be in rest but the upper part tends to remain in motion.
(3) Inertia Of Direction
It is the inability of a body to change its direction by itself.
For example, the mud stick to the wheels of a moving vehicle flies tangentially to the wheel during motion. Because there's no external force acting on the mud, so it follows the direction of the wheel.