Inclined Planes with Friction Video Lessons

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Problem: A 20 N crate is held at rest on an incline by a rope that is parallel to the incline as shown on the figure to the right. The incline is 30° above the horizontal. The coefficient of static friction,  μs, between the crate and the incline is 0.35.a) Draw a free body diagram for the crate.b) Rank all the forces acting on the crate from largest to smallest.

FREE Expert Solution

(a) We'll use a tilted coordinate system with the x-axis parallel to the incline and the y-axis perpendicular to the incline. Tilting/rotating the coordinate system enables us to break force components with ease.

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Problem Details

A 20 N crate is held at rest on an incline by a rope that is parallel to the incline as shown on the figure to the right. The incline is 30° above the horizontal. The coefficient of static friction,  μs, between the crate and the incline is 0.35.

a) Draw a free body diagram for the crate.

b) Rank all the forces acting on the crate from largest to smallest.

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