First slide

Different types of Forces

Question

Two blocks of masses ‘3m’ and ‘2m’ are in contact on a smooth table. A force P is first applied horizontally on block of mass ‘3m’ and then on mass ‘2m’. The contact forces between the two blocks in the two cases are in the ratio

Moderate

A

1:2
B

2:3
C

3:2
D

5:3

Solution

Acceleration of the system in both cases is given by a = p/5m
N₁ = 2m x p/5m ⇒ 2p/5
N₂ = 3ma = 3m x p/5m ⇒ 3p/5
$\large \therefore$ N₁ : N₂ = 2 : 3

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