Inertia
Inertia
A body can not change its state of rest or uniform motion unless an unbalanced force is applied on it. The inability of a body to change on its own its state of rest or uniform motion is known as inertia. It is an inherent property of all objects. Inertia of an object is measured by its mass. Inertia is directly proportional to the mass. It means that inertia increases with increase in mass and decreases with decreases in mass. A heavy object will have more inertia than a lighter object. For example:
1. Inertia at Rest:
If we keep a body at rest, it remains there for any length of time if no force is applied on it, is called inertia of rest. It may also be defined as the tendency of the body to oppose any change in state of rest.
Examples:
(i) Jerks while travelling: When we stand in a bus and the bus starts suddenly, we tend to fall backward. This is because our feet are in contact with the floor of the bus and the friction at the contact is high. This force does not allow the feet slip on the floor. The feet move forward with the floor. The upper body does not feel the forward force immediately and remains at rest for a while. So, the upper part of our body gets jerked backward.
Similarly, when the bus stops suddenly, the feet come to rest immediately, but the upper body continues to move in forward direction. So, we tend to fall forward.
(ii) Card Coin Experiment: Place a coin a smooth card kept on a glass as shown. Flick the card sharply in the horizontal direction. The card flies away and coin drops into the glass.
A and B are two objects with mass 6 kg and 34 kg respectively. Then | |||
| Right Option : B | |||
| View Explanation |
Which of the following are correct ? (a) The inability of a body to change on its own its state of rest or uniform motion is known as inertia. (b) If we keep a body at rest, it remains there for any length of time if no force is applied on it, is called inertia of rest. (c) The tendency of the body to continue in the same direction until some unbalanced force is applied on it is called as inertia of motion . | |||
| Right Option : A | |||
| View Explanation | |||
Which of the following has the largest intertia? | |||
| Right Option : D | |||
| View Explanation | |||
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