#### Laws of Motion Four and Seven Marks Questions

10th Standard

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Science

Time : 01:00:00 Hrs
Total Marks : 55
5 x 4 = 20
1. What are the concepts prepared by Galileo?

2. Give the application of torque.

3. Give examples for Newton's third law.

4. Derive the Relation between g and G?

5. Discuss the apparent weight of a man in lift?

6. 5 x 7 = 35
7. Calculate the velocity of a moving body of mass 5 kg whose linear momentum is 2.5 kg m s-1.

8. A door is pushed, at a point whose distance from the hinges is 90 cm, with a force of 40 N. Calculate the moment of the force about the hinges.

9. At what height from the centre of the Earth the acceleration due to gravity will be 1/4th of its value as at the Earth.

10. A cricket ball of mass 25 g moving with a speed of 12 ms-1 is hit by a bat so that the ball is turned back with a velocity of 20 ms-1. Calculate the impulse received by the ball?

11. Force of 50 N acts perpendicular on a body, which is fixed at a point O. The distance of point of action of force from O is 5 cm. Find the moment of force.