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Amit buys a few grams of gold at the poles as per the instruction of one of his friends. He hands over the same when he meets him at the equator. Will the friend agree with the weight of gold bought? If not, why? [Hint: The value of g is greater at the poles than at the equator?

Class 9 Physics
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What do we call the gravitational force between the earth and an object?

Class 9 Physics
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What is the acceleration of free fall?

Class 9 Physics
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What is the importance of universal law of gravitation?

Class 9 Physics
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What happens to the force between two objects, if (i) the mass of one object is doubled? (ii) the distance between the objects is doubled and tripled? (iii) the masses of both objects are doubled?

Class 9 Physics
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If the moon attracts the earth, why does the earth not move towards the moon?

Class 9 Physics
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The earth and the moon are attracted to each other by gravitational force. Does the earth attract the moon with a force that is greater or smaller or the same as the force with which the moon attracts the earth? Why?

Class 9 Physics
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What is the magnitude of the gravitational force between the earth and a 1 kg object on its surface? (Mass of the earth is 6 × 1024 kg and radius of the earth is 6.4 × 106 m.)

Class 9 Physics
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Gravitational force acts on all objects in proportion to their masses. Why then, a heavy object does not fall faster than a light object?

Class 9 Physics
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How does the force of gravitation between two objects change when the distance between them is reduced to half ?

Class 9 Physics
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You have a bag of cotton and an iron bar, each indicating a mass of 100 kg when measured on a weighing machine. In reality, one is heavier than other. Can you say which one is heavier and why?

Class 9 Physics
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You find your mass to be 42 kg on a weighing machine. Is your mass more or less than 42 kg?

Class 9 Physics
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