Advertisements
Advertisements
Question
A goalkeeper in a game of football pulls his hands backwards after holding the ball shot at the goal. This enables the goalkeeper to
Options
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
Solution
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
RELATED QUESTIONS
An archer stretches her bow while taking aim at the target. She then releases the arrow, which begins to move towards the target. Based on this information fill up the gap in the following statement using the following terms.
While the arrow moves towards its target, the forces acting on it are due to ______ and that due to ______ of air.
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 |
Select the correct alternative.
Friction is increased if
Explain the meaning of the term force.
Fill in the blank.
Magnetic force is a ................ force.
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.
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 |
Solve the crossword puzzle.
Across
1. Type of force which depends upon the roughness of a surface
2. An effect of friction
3. The force of friction caused due to fluids
4. Type of friction acting between two bodies at rest
5. Type of friction which occurs when applied force overcomes static friction
6. A special body design to enable minimum drage Down
