Chapter 7 Circular Motion _ Test 3

1. Which is the best approximation of the weight of an object of mass 800 gram.

1) 0.8 N
2) 880N
3) 8N
4) 80 N
2. Gravitational force between two objects is directly proportional to the.

1) Product of their masses
2) difference of their masses
3) Square of the distance between them
4) sum of their masses
3. If m1 = m2 =1 kg and d=1m the value of F will be equal to

1) Me
2) g
3) G
4) Re
4. An apple falls towards the earth due to

1) Nuclear force
2) Force of gravity
3) Centripetal force
4) Centrifugal force
5. An object of mass 2kg is moving in a circle of radius .5 m with the speed of 20m/s then centripetal force will be :

1) 1600N
2) 800N
3) 900N
4) 3200N
6. The motion in a circular path is called _________

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7. A force which acts on an object moving in a circle and is directed towards the centre of circle is called _____

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8. A moving body _____ to move with uniform speed along a straight path if no external fore acts on it.

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9. If a body is moving and external force is applied in the direction of motion then its speed ______

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10. The magnitude of centrifugal force is ___________

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11. When a body is moving along curved path the direction of motion at any point is represented by _____ drawn at that point

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12. Velocity of an object moving in a circle _____ constantly

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13. In circular motion _____ is perpendicular to the velocity of object

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14. Centripetal force is always directed towards the _________ of circle

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15. According to Newton's laws of motion centripetal ______ is directed along the direction of the centripetal force.

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