A block of mass m is at rest on an inclined plane that makes an angle of 30^owith the horizontal. Which of the following statements about the force of static friction is true? A) f_s mg B) f_s mg cos 30^o C) fs = mg cos 30^o D) f_s = mg sin 30^o E) None of these statements is true.

Question

A block of mass m is at rest on an inclined plane that makes an angle of 30^owith the horizontal. Which of the following statements about the force of static friction is true? A) f_s > mg B) f_s > mg cos 30^o C) fs = mg cos 30^o D) f_s = mg sin 30^o E) None of these statements is true.

Quizplus · Accepted Answer

The force of static friction (fs) is equal to the component of gravitational force parallel to the inclined plane, which is mg sin 30°.

A Block of Mass M Is at Rest on an Inclined