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Q. 4

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Physics for Scientists and Engineers: A Strategic Approach with Modern Physics
Found in: Page 227

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Short Answer

A horizontal rope with 15 N tension drags a 25 kg box 2.0 m to the left across a horizontal surface. How much work is done by
(a) tension and (b) gravity?

a) Work done by Tension = 30 J

b) Work done by gravity = 0 J

See the step by step solution

Step by Step Solution

Part(a) Step 1 : given information

A horizontal rope with 15 N tension drags a 25 kg box 2.0 m to the left across a horizontal surface

Part(a) Step 2: Explanation

We know Work done by tension= Force x displacement in the direction of force

In this case work done by tension = Tension x displacement

Wt= 15 x 2 = 30 J

Part(b) Step 1 : Given information

A horizontal rope with 15 N tension drags a 25 kg box 2.0 m to the left across a horizontal surface

Part(b)Step 2:  Explanation

We know Work done = Force x displacement in the direction of force

Work done by gravity = gravitational force x vertical displacement

Wgravity = 0, as the vertical displacement is 0.

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