Question

The force of attraction between two bodies is 20N. Calculate the force between them when the mass and distance between them is halved

Answer 1

F ∝ m / r^2

F1 / F2 = (m1 / m2) * (r2 / r1)^2

F2 = F1 * (r1 / r2)^2 * (m2 / m1)

F2 = F1 * (r1 / (r1/2))^2 * (m1/2 / m1)

F2 = F1 * 4/2

F2 = 2 * F1

F2 = 2 * 20

F2 = 40 N

Force of attraction will become 40 N.

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