Define Inertia. Describe a simple experiment to demonstrate the inertia of rest. [5 MARKS]
Define Inertia. Describe a simple experiment to demonstrate the inertia of rest. [5 MARKS]
Definition : 1 Mark
Steps of demonstration : 2 Mark
Observation : 1 Mark
Conclusion : 1 Mark
Definition : The property of matter by which it continues in its existing state of rest or uniform motion in a straight line, unless that state is changed by an external force.
1. Experiment
i. Make a pile of similar carom coins on a table.
ii. Attempt a sharp horizontal hit at the bottom of the pile using another carom coin or the striker.
2. Observation :
If the hit is strong enough, the bottom coin moves out quickly. Once the lowest coin is removed, the inertia of the other coins makes them ‘fall’ vertically on the table.
3. Conclusion:
The activity given above illustrate that there is a resistance offered by an object to change its state of motion. If it is at rest it tends to remain at rest; if it is moving it tends to keep moving. The resistance offered by a body to its change of rest is known as inertia of rest. This property of an object is called its inertia.
(Other demonstrations : We know that it is easier to push an empty box than a box full of books. Similarly, if we kick a football it flies away. But if we kick a stone of the same size with equal force, it hardly moves.)
Definition : 1 Mark
Steps of demonstration : 2 Mark
Observation : 1 Mark
Conclusion : 1 Mark
Definition : The property of matter by which it continues in its existing state of rest or uniform motion in a straight line, unless that state is changed by an external force.
1. Experiment
i. Make a pile of similar carom coins on a table.
ii. Attempt a sharp horizontal hit at the bottom of the pile using another carom coin or the striker.
2. Observation :
If the hit is strong enough, the bottom coin moves out quickly. Once the lowest coin is removed, the inertia of the other coins makes them ‘fall’ vertically on the table.
3. Conclusion:
The activity given above illustrate that there is a resistance offered by an object to change its state of motion. If it is at rest it tends to remain at rest; if it is moving it tends to keep moving. The resistance offered by a body to its change of rest is known as inertia of rest. This property of an object is called its inertia.
(Other demonstrations : We know that it is easier to push an empty box than a box full of books. Similarly, if we kick a football it flies away. But if we kick a stone of the same size with equal force, it hardly moves.)
