A 40-N crate is pulled up a 4-m inclined plane by a worker at constant velocity.If the plane is inclined at an angle of 37° to the horizontal and there exists a constant frictional force of 10 N between the crate and the surface,what is the force applied by the worker?
A) zero
B) 14 N
C) 24 N
D) 34 N
E) 136 N

Question

A 40-N crate is pulled up a 4-m inclined plane by a worker at constant velocity.If the plane is inclined at an angle of 37° to the horizontal and there exists a constant frictional force of 10 N between the crate and the surface,what is the force applied by the worker?
A) zero
B) 14 N
C) 24 N
D) 34 N
E) ​136 N

Quizplus · Accepted Answer

The force applied by the worker must counteract both the gravitational component along the plane and the frictional force. The gravitational component is 40 N * sin(37°) ≈ 24 N. Adding the frictional force of 10 N, the total force required is 24 N + 10 N = 34 N.

A 40-N Crate Is Pulled Up a 4-M Inclined Plane