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प्रश्न
Answer the following in short.
Why is magnetic force considered as an action-at-a-distance force?
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उत्तर
Magnetic force comes into play even when the magnet and other objects (like iron) are kept at a distance and not in direct contact with each other. Hence, magnetic-force is considered as an action-at-a-distance force.
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संबंधित प्रश्न
Give two examples of situations in which you push to change the state of motion of objects.
To move a loaded trolley we have to ______ it.
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 |
Match the following.
| Column A | Column B |
| 1. Rolling friction | a. making grooved designs |
| 2. Static friction | b. regular oiling |
| 3. Reducing friction | c. a book placed on a tabletop |
| 4. Increasing Friction | d. wheels of a car |
Answer the following in detail.
Differentiate between contract and non-contract force. Support your answer with suitable examples.
A truck of mass M is moved under a force F. If the truck is then loaded with an object equal to the mass of the truck and the driving force is halved, then how does the acceleration change?
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?
