What horizontally-applied force will accelerate a 400-kg crate at 1 m/s2 across a factory floor against a friction force half its weight?
A)600 N
B)1600 N
C)2000 N
D)2400 N
E)none of these

Question

Quizplus · Accepted Answer

The friction force is half the weight of the crate, which is 0.5 * 400 kg * 9.8 m/s² = 1960 N. To accelerate the crate at 1 m/s², the net force required is 400 kg * 1 m/s² = 400 N. Therefore, the applied force must overcome both the friction and provide the net force: 1960 N + 400 N = 2360 N, which rounds to 2400 N.

What Horizontally-Applied Force Will Accelerate a 400-Kg Crate at 1