A rope is tied to a large crate,which is sitting on a flat surface.The coefficient of static friction between the crate and the ground is 0.9.If a person is to pull on the rope with the minimum force needed such that the crate begins to slide,the angle between the rope and the ground should be
A)greater than 0 degrees but less than 90 degrees.
B)0 degrees (rope is horizontal).
C)90 degrees.

Question

Quizplus · Accepted Answer

Pulling at an angle greater than 0 degrees but less than 90 degrees reduces the normal force and thus the friction, making it easier to overcome static friction.

A Rope Is Tied to a Large Crate,which Is Sitting