JEE Main Physics question

Physics Laws of Motion JEE Main

A spring balance and a physical balance are kept in a lift. In these balances equal masses are placed. If now the lift starts moving upwards with constant acceleration, then

(A)The reading of spring balance will increase and the equilibrium position of the physical balance will disturb
(B)The reading of spring balance will remain unchanged and physical balance will remain in equilibrium
(C)The reading of spring balance will decrease and physical balance will remain in equilibrium
(D)The reading of spring balance will increase and the physical balance will remain in equilibriumCorrect

Answer: (D)

Solution

A spring balance measures the actual normal force, which becomes m(g+a) > mg when the lift accelerates upward, so its reading increases. A physical (beam) balance compares the weights (torques)

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Question ID VK-153393