Physics
Class 9
Lakhmir Singh
1
Chapter 1: Motion
117 questions
2
Chapter 2: Force and Laws of Motion
114 questions
3
Chapter 3: Gravitation
157 questions
4
Chapter 4: Work and Energy
128 questions
Q1
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?
Q2
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°?
Q3
Question 75:
How much work is done by the gravitational force of earth acting on a satellite moving around it in a circular path? Give reason for your answer.
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Chapter 5: Sound
162 questions
Question
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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Text solution
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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.
When the direction of force is similar the direction of motion, and hence, the work done is maximum.
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.
When the direction of force is similar the direction of motion, and hence, the work done is maximum.
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How much work is done by the gravitational force of earth acting on a satellite moving around it in a circular path? Give reason for your answer.
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| Question Text | 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°? |
| Topic | Work and Energy |
| Subject | Science |
| Class | Class 9 |
| Answer Type | Text solution:1 |
| Upvotes | 100 |
