Advertisements
Advertisements
प्रश्न
A goalkeeper in a game of football pulls his hands backwards after holding the ball shot at the goal. This enables the goalkeeper to
विकल्प
exert larger force on the ball
reduce the force exerted by the ball on hands
increase the rate of change of momentum
decrease the rate of change of momentum
Advertisements
उत्तर
decrease the rate of change of momentum
Explanation:
The goalkeeper pulls his hands backwards after holding the ball to decrease the rate of change of momentum by increasing the time. By doing this, less force is exerted on his hands (v Force is directly proportional to the rate of change of momentum).
APPEARS IN
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.
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 |
Give one example of force as a push
State if the following statement is true or false. Correct the statement if it is false.
It is possible that a force applied to an object may not bring any change in it.
Answer the following in short.
Why is magnetic force considered as an action-at-a-distance 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 |
Give a reason for the following.
Brake handles of motorcycles are generally covered with a toweled cloth?
A horse continues to apply force in order to move a cart with a constant speed. Explain why?
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?
