Q1 How does the force of gravitation between two objects change when the distance between them is reduced to half ?... Q2 Gravitational force acts on all objects in proportion to their masses. Why then, a heavy object does not fall fas... Q3 What is the magnitude of the gravitational force between the earth and a 1 kg object on its surface? (Mass of the... Q4 The earth and the moon are attracted to each other by gravitational force. Does the earth attract the moon with a... Q5 If the moon attracts the earth, why does the earth not move towards the moon?... Q6 What happens to the force between two objects, if (i) the mass of one object is doubled? (ii) the distance betw... Q7 What is the importance of universal law of gravitation?... Q8 What is the acceleration of free fall?... Q9 What do we call the gravitational force between the earth and an object?... Q10 Amit buys few grams of gold at the poles as per the instruction of one of his friends. He hands over the same whe... Q11 Why will a sheet of paper fall slower than one that is crumpled into a ball?... Q12 Gravitational force on the surface of the moon is only 1/6 as strong as gravitational force on the earth. What is... Q13 A ball is thrown vertically upwards with a velocity of 49 m/s. Calculate (i) the maximum height to which it rise... Q14 A stone is released from the top of a tower of height 19.6 m. Calculate its final velocity.... Q15 A stone is thrown vertically upward with an initial velocity of 40 m/s. Taking g = 10 m/s2, find the maximum heig... Q16 Calculate the force of gravitation between the earth and the Sun, given that the mass of the earth = 6 × 10... Q17 A stone is allowed to fall from the top of a tower 100 m high and at the same time another stone is projected ver... Q18 A ball thrown up vertically returns to the thrower after 6 s. Find (a) the velocity with which it was thrown up,... Q19 In what direction does the buoyant force on an object immersed in a liquid act?... Q20 Why does a block of plastic released under water come up to the surface of water?... Q21 The volume of 50 g of a substance is 20 cm3. If the density of water is 1 g cm-3, will the substance float or sin... Q22 The volume of a 500 g sealed packet is 350 cm3. Will the packet float or sink in water if the density of water is...
Question 6
Answer According to the universal law of gravitation, (i) Force is directly proportional to the masses of the objects. If the mass of one object is doubled, then the gravitational force will also get doubled. (ii) Force is inversely proportional to the square of the distances between the objects. If the distance is doubled, then the gravitational force becomes one-fourth. Similarly, if the distance is tripled, then the gravitational force becomes one-ninth. (iii) Force is directly proportional to the product of masses of the objects. If the masses of both the objects are doubled, then the gravitational force becomes four times. Popular Questions of Class 9 Science
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