Force Required for Upward Acceleration · PhysicsBowl 2016 #10

Physics · mechanics

Problem

A person wishes to accelerate an object upward uniformly. Which one of the following choices must be true of the force,

F

, provided by the person onto the object?

W

represents the magnitude of the gravitational force acting on the object. Ignore any effects of the air or of the Earth's rotation. (A)

F = W

(B)

F ≥ W

(C)

F > W

(D)

F ≥ 2W

(E)

F > 2W