| Read the following and answer any four questions from [16] to [20]. |
| Newton studied the ideas of Galileo regarding the motion of an object. He formulated three fundamental laws that govern the motion of objects. These three laws are known as Newtons laws of motion. |
| The first law of motion states that an object will continue to remain in its state of rest or of uniform motion along a straight line path unless an external force acts on it. This means, all objects resist change in their state. |
| The second law of motion states that the rate of change of momentum of an object is directly proportional to the applied external force and takes place in the direction in which external force acts. |
| The third law of motion states that whenever an object exerts a force on another object, then the second object exerts an equal and opposite force on the first object. |
| A goalkeeper in a game of football pulls his hands backwards after holding the ball shot at the goal. This enables the goalkeeper to |
| I. exert larger force on the ball |
| II. reduce the force exerted by the ball on hands |
| III. increase the rate of change of momentum |
| IV. decrease the rate of change of momentum |
A) I, II
B) II, IV
C) II, III
D) I, IV
Correct Answer: B
Solution :
[b] A large force that acts in a very short duration of time is referred to as impulsive force. This force which is large due to high speed such as a kick of a football may be disastrous as the momentum changes and hence a goal keeper pulls his hand backwards to reduce the force exerted by the ball on hands and also the rate of momentum change.
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