Q. 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 equilibrium
Explanation
(d) The fictitious force will act downwards. So the reading of spring balance will increase. In case of physical balance, the fictitious force will act on both the pans, so the equilibrium is not affected
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.