Question

(a) Prove that if the earth attracts two bodies placed at the same distance from We centre of earth,. with equal force; then their masses will be the same.
(b) Mathematically express the acceleration due to gravity that is expressed by a free falling °bled. (c) Why is 'G' called a universal constant ?

CBSE Class IX Science LA (5 Marks)

Answer 1

(a) Let mass of first body be m1 Let mass of second body be m2 Force on 1st body = Force on 2nd body GMmi/R2 = GMm2/R2 G and G cancel. M and M cancel, R2 and R2 cancel This leaves
1\41 =M2
Hence proved. (b) g = GM/ R2 (c) Its value is constant in universe

Answer 2

will be the same. (b) Mathematically express the acceleration due to gravity that is expressed by a free falling ° bled. (c) Why is 'G' called a universal constant ?