A suitcase is hung from a spring balance fixed to the ceiling of a lift
PHYSICS · Single correct · AP · Physics 1: Algebra-based · Force and Translational Dynamics · Force and Translational Dynamics
Problem
A 5kg suitcase is hung from a spring balance fixed to the ceiling of a lift. The balance reads 49N when the lift is at rest. Under which of the following conditions will the balance reading become less than 49N?
(a) The lift moves upward with uniform speed
(b) The lift accelerates downward
(c) The lift accelerates upward
(d) The lift moves downward with uniform speed