Inertia and Mass MCQs Quiz | Class 9
Class IX Science (Code 086), Unit III: Motion, Force and Work. This quiz covers the topic Inertia and Mass, focusing on the relationship where a heavier body possesses greater inertia. Attempt these 10 multiple-choice questions to test your understanding, then submit to check your score and download the answer key PDF for offline revision.
Educational Content: Inertia and Mass
In physics, inertia is the inherent property of an object to resist any change in its state of rest or of uniform motion. This concept is fundamentally linked to the mass of the object. The relationship is direct: the greater the mass, the greater the inertia.
Key Concepts
- Definition of Inertia: It is the tendency of undisturbed objects to stay at rest or to keep moving with the same velocity.
- Measure of Inertia: Mass is the quantitative measure of inertia. A heavier object requires more force to change its state than a lighter one because it has more inertia.
- Newton’s First Law: Often called the Law of Inertia, it states that an object remains in a state of rest or of uniform motion in a straight line unless compelled to change that state by an applied force.
Types of Inertia
Inertia can be categorized into three types based on the state being resisted:
- Inertia of Rest: The resistance of a body to change its state of rest (e.g., dust falling when a carpet is beaten).
- Inertia of Motion: The resistance of a body to change its state of uniform motion (e.g., passengers falling forward when a bus stops suddenly).
- Inertia of Direction: The resistance of a body to change its direction of motion (e.g., mud flying tangentially off a spinning wheel).
Comparison Table: Mass vs. Inertia
| Property | Description |
|---|---|
| Nature | Mass is the amount of matter; Inertia is the resistance to change. |
| Dependency | Inertia depends entirely on mass. |
| Unit | Mass is measured in kilograms (kg); Inertia has no specific unit but is measured by mass. |
| Example | A train has high mass and thus high inertia compared to a bicycle. |
Quick Revision List
- Force is needed to overcome inertia.
- Heavier bodies have greater inertia than lighter bodies.
- Inertia is an intrinsic property of matter.
- If mass is doubled, inertia is also doubled.
Extra Practice Questions
1. Why does a fan continue to rotate for some time after being switched off? (Due to inertia of motion).
2. Which law of motion gives the definition of inertia? (Newton’s First Law).
3. If a 2kg stone and a 10kg stone are dropped, which is harder to stop? (The 10kg stone).
4. What happens to a coin placed on a card over a tumbler if the card is flicked? (Coin falls into tumbler due to inertia of rest).
5. Can inertia exist without mass? (No, mass is the measure of inertia).
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