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Q. 34

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Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
Found in: Page 229

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Short Answer

An kg crate is pulled m up a incline by a rope angled above the incline. The tension in the rope is N, and the crate’s coefficient of kinetic friction on the incline is .

a. How much work is done by tension, by gravity, and by the normal force?

b. What is the increase in thermal energy of the crate and incline?

a). work done by tension is J, by gravity is J and by normal force is J

b). increase in thermal energy is J

See the step by step solution

Step by Step Solution

Step 1. Given information

We have,

An kg crate is pulled m up a incline by a rope angled above the incline. The tension in the rope is N, and the crate’s coefficient of kinetic friction on the incline is .

Step 2. Find work done by tension, gravity and normal force

We can use , where is angle between force and direction. In case of tension, that angle is , in case of gravity is and for normal force.

Work done by tension

Work done by gravity

Work done by normal force

Step 3. Find increase in thermal energy

Thermal energy in this case due to friction.

Then increase in thermal energy is

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