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Question 73: What should be the angle between the direction of
Physics by Lakhmir Singh
Physics

Class 9

Lakhmir Singh

Author:
Lakhmir Singh
Publisher:
S. Chand
Subject:
Science
1

Chapter 1: Motion

117 questions

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2

Chapter 2: Force and Laws of Motion

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3

Chapter 3: Gravitation

157 questions

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4

Chapter 4: Work and Energy

128 questions

Q1
Question 71: A boy tries to push a truck parked on the roadside. The truck does not move at all. Another boy pushes a bicycle. The bicycle moves through a certain distance. In which case was the work done more : on the trick or on the bicycle? Give a reason to support your answer.
Q2
Question 73: What should be the angle between the direction of force and the direction of motion of a body so that the work done is zero?
Q3
Question 74: In which of the following case the work done by a force will be maximum : when the angle between the direction of force and direction of motion is 0° or 90°?
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5

Chapter 5: Sound

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Question 73: What should be the angle between the direction of force and the direction of motion of a body so that the work done is zero?

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Updated on: Oct 17, 2022

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Physics (Lakhmir Singh)

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Text SolutionText solutionverified iconVerified

Answer: The relation between work, force, distance and angle between the two is:
W = (F) (S) cos θ
Where,
(W) - Work done
(F) - Force
(S) - Displacement
(θ) - Angle between force and displacement
When the force is perpendicular to the direction of motion,   and hence, the work done is also zero.
Example - The work done by the earth on a satellite moving in a circular orbit around it is zero.
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Question Text
Question 73: What should be the angle between the direction of force and the direction of motion of a body so that the work done is zero?
Updated OnOct 17, 2022
TopicWork and Energy
SubjectScience
ClassClass 9
Answer TypeText solution:1 Video solution: 1
Upvotes243
Avg. Video Duration2 min