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प्रश्न
Answer the following in detail.
Differentiate between contract and non-contract force. Support your answer with suitable examples.
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उत्तर
| Contract force | Non-contact force | ||
| i) | These are forces that need a physical touch on the object to act upon it. | i) | These are forces that do not need physical contact to act on an object. |
| ii) | These may or may not be natural forces. | ii) | These are natural forces. |
| iii) | They cannot work from a distance. | iii) | They can work from a distance as well. |
| iv) | Its various types are applied to force, normal force, tension, frictional force. | iv) | Its various types are magnetic force, electrostatic force, gravitational force. |
| v) | Example: Player kicking a ball, game of tug-of-war, rolling ball stops, itself, horse pulling a cart, etc. | v) | Example: Magnet attracting iron nails, mango falling from a tree, charged plastic ruler attracts bits of dry-paper, etc. |
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संबंधित प्रश्न
In the following situation identify the agent exerting the force and the object on which it acts. State the effect of the force in case.
Taking out paste from a toothpaste tube.
In the following situation identify the agent exerting the force and the object on which it acts. State the effect of the force in case.
A load suspended from a spring while its other end is on a hook fixed to a wall.
In the following situation identify the agent exerting the force and the object on which it acts. State the effect of the force in case.
An athlete making a high jump to clear the bar at a certain height.
Match the following columns
| Column A | Column B |
| a) Non contact force | 1) repel |
| b) Like poles | 2) kg |
| c) Contact force | 3) gravitational force |
| d) Mass | 4) wear and tear |
| e) Weight | 5) force of friction |
| f) Friction | 6) kgf |
Select the correct alternative.
Friction is increased if
Give one example of force as a push
Fill in the blank.
Magnetic force is a ................ force.
Match the following.
| Column A | Column B |
| 1. Non-contact forces | a. perpendicular to surface |
| 2. Catapult | b. an act of push or pull |
| 3. Force | c. unit of force |
| 4. Normal force | d. action-at-a-distance forces |
| 5. Newton | e. contact force |
Can you identify whether it is push or pull that results in motion in the following cases?
 |
 |
 |
| Push / Pull | Push / Pull | Push / Pull |
 |
 |
 |
| Push / Pull | Push / Pull | Push / Pull |
In the following figure, two boys A and B are shown applying force on a block. If the block moves towards the right, which one of the following statements is correct?
