Q34 of 176 Page 101

Explain why, if a stone held in out hand is released, it falls towards the earth.

When the stone held in our hand is released it falls down because the earth exerts a force of attraction which is also known as gravity, on the stone and pulls it down.


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32

What happens to the gravitational force between two objects when the distance between them is: (i) Doubled (ii) Halved

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State two applications of universal law of gravitation.

 35

Calculate the force of gravitation between two objects of masses 50 kg and

120 kg respectively kept at a distance of 10 m from one another. (Gravitational constant, G = 6.7 × 10-11 Nm2 Kg-2)

 36

What is the force of gravity on a body of mass 150 kg lying on the surface of the earth? (Mass of earth = 6×1024 kg; Radius of earth = 6.4× 106 m; G = 6.7×10-11 Nm2/kg2)