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Chapter 9: Q. 4 (page 227)

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?

Short Answer

Expert verified

a) Work done by Tension = 30 J

b) Work done by gravity = 0 J

Step by step solution

01

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

02

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

03

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

04

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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