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प्रश्न
Answer the following in short.
Why is magnetic force considered as an action-at-a-distance force?
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
In the following situations identify the agent exerting the force and the object on which it acts. State the effect of the force in case.
Squeezing a piece of lemon between the fingers to extract its juice.
Fill in the blank.
Force is applied as ........... or ..........
Fill in the blank.
On pulling a string, its .................. increases.
Give one example of force as a pull
State if the following statement is true or false. Correct the statement if it is false.
Two equal and opposite forces acting on an object balance out each other.
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 horse continues to apply force in order to move a cart with a constant speed. Explain why?
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 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?
