Question

State the difference between gravity and gravitation. A sphere of mass 40 kg is attracted by another sphere of mass 80 kg, by a force of 2.5 x le N when their centres are 300 mm apart. Find the value of G

CBSE Class IX Science SA 2 (3 Marks)

Answer 1

The force of gravitation exerted by Earth (or any other planet) on the objects on its surface is called gravity. Every object attracts every other object due to the force of gravitation. Hence, gravity is a special case of Gravitation. 

F = G/R²Mm

[As R = 300 mm = 300 x 10-3 m] 6/2.5 x 10 = G(80)(40) / (300 x 10⁻³)²

G -- (300 x 10⁻³)2 x (2.5 x 10⁻⁶) / 3200

G = 7.03 x 10⁻¹¹  Nm² kg⁻²

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