1. Which force is responsible for stability of our universe?
2. Which force is required to maintain a body in uniform circular motion?
3. What is gravity?
4. How is the weight of an object related to its mass?
5. Mass of boy on earth is 40kg, what is the mass on the moon?
6. What is the effect of shape of earth on value of ‘g’?
7. Why do we feel uneasy when ferry wheels moves downwards?
8. Derive formula of universal law of gravitation.
9. The acceleration of a freely falling body does not depend on the mass of the body. Prove this.
10. Establish relationship between ‘g’ and ‘G’.
11. Show that the acceleration due to gravity at the surface of moon is about 1/6 of that at the surface of the earth.
12. What is centripetal force? Define it with example.
13. With what force will body of mass 1kg get attracted to the earth?
14. Calculate the value ‘g’, acceleration due to gravity.
Answers
Answer:
1. Gravitational Force
2. Centripetal force
3. The natural force that makes thing fall to the ground when you drop them.
4. In a uniform gravitational field, weight of an object is directly proportional to its mass.
5. It would be the same i.e. 40 kg
6. The value will be decrease as a person goes into a very deep mine inside earth as the distance would decrease from its centre. So the shape of earth is important in determining the value of g
7. The ferry wheel spins upwards with the help of motor, while gravity pulls the wheel back down again. One feels uneasy because the ferry spins the seat can freely rotate at the support where they are connected to the wheel.
9. The acceleration of a freely falling body is equal to 'g' which is known as acceleration due to gravity. Hence it is clear that acceration of a freely falling body dosent depend on its mass.
12. A force that acts in a body moving in a circular path and is directed towards the centre around which the body is moving.
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