Starting from rest, a 5.00-kg block slides 2.50 m down a rough 30.0º incline. The coefficient of kinetic friction between the block and the incline is μk = 0.436. Determine a. the work done by the force of gravity, b. the work done by the friction force between block and incline, c. the work done by the normal force, d. how the work done by gravity would change if a shorter ramp at a steeper angle were used to span the same verticle height.

Principles of Physics: A Calculus-Based Text
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Author:Raymond A. Serway, John W. Jewett
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Chapter6: Energy Of A System
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Starting from rest, a 5.00-kg block slides 2.50 m down a rough 30.0º incline.  The coefficient of kinetic friction between the block and the incline is μk = 0.436.  Determine

a. the work done by the force of gravity,

b. the work done by the friction force between block and incline,

c. the work done by the normal force,

d. how the work done by gravity would change if a shorter ramp at a steeper angle were used to span the same verticle height.

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