Introductory Static Friction on an Incline Problem

The video tutorial explains how to determine the coefficient of static friction between a book and an inclined plane. It begins with identifying known values and proceeds to draw a free body diagram to illustrate the forces involved. The tutorial then sums the forces in both parallel and perpendicular directions to the incline. Finally, it derives the coefficient of static friction using trigonometric relationships, concluding with a calculation based on a 15-degree incline angle.

What is the known incline angle at which the book starts to slide?

• 20 degrees

• 25 degrees

• 15 degrees

• 10 degrees

Which force acts perpendicular to the incline and opposes the motion of the book?

• Static friction

• Normal force

• Kinetic friction

• Force of gravity

What happens to the force of static friction as the incline angle increases?

• It becomes zero

• It increases

• It remains constant

• It decreases

At what point does static friction switch to kinetic friction?

• When the incline angle is zero

• When the force of gravity is maximum

• When the force of gravity parallel exceeds static friction

• When the normal force is zero

What is the formula for the force of gravity parallel to the incline?

• Mass times acceleration due to gravity

• Mass times acceleration due to gravity times sine Theta

• Mass times acceleration due to gravity times cosine Theta

• Mass times acceleration due to gravity times tangent Theta

How is the coefficient of static friction calculated in this scenario?

• As the cosine of the incline angle

• As the sine of the incline angle

• As the cotangent of the incline angle

• As the tangent of the incline angle

What is the calculated coefficient of static friction for the incline angle of 15 degrees?

• 0.45

• 0.35

• 0.27

• 0.15