NCERT Solutions Class 9 Maths Chapter 11 Work And Energy – Here are all the NCERT solutions for Class 9 Maths Chapter 11. This solution contains questions, answers, images, explanations of the complete Chapter 11 titled The Fun They Had of Maths taught in class 9. If you are a student of class 9 who is using NCERT Textbook to study Maths, then you must come across Chapter 11 Work And Energy. After you have studied lesson, you must be looking for answers of its questions. Here you can get complete NCERT Solutions for Class 9 Maths Chapter 11 Work And Energy in one place.
NCERT Solutions Class 9 Science Chapter 11 Work And Energy
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For a better understanding of this chapter, you should also see summary of Chapter 11 Work And Energy , Science, Class 9.
| Class | 9 |
| Subject | Science |
| Book | Science |
| Chapter Number | 11 |
| Chapter Name |
Work And Energy |
NCERT Solutions Class 9 Science chapter 11 Work And Energy
Class 9, Science chapter 11, Work And Energy solutions are given below in PDF format. You can view them online or download PDF file for future use.
Work And Energy
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Question & Answer
Q.1: A force of 7 N acts on an object. The displacement is, say 8 m, in the direction of the force (Fig. 11.3). Let us take it that the force acts on the object through the displacement. What is the work done in this case?
Ans : When a force F acts on an object to displace it through a distance S in its direction, then the work done W on the body by the force is given by: Work done = Force × Displacement W = F × S Where, F = 7 N S = 8 m Therefore, work done, W = 7 × 8 = 56 Nm = 56 J
Q.2: When do we say that work is done?
Ans : Work is done whenever the given conditions are satisfied: (i) A force acts on the body. (ii) There is a displacement of the body caused by the applied force along the direction of the applied force.
Q.3: Write an expression for the work done when a force is acting on an object in the direction of its displacement.
Ans : When a force F displaces a body through a distance S in the direction of the applied force, then the work done W on the body is given by the expression: Work done = Force × Displacement W = F × s
Q.4: Define 1 J of work.
Ans : 1 J is the amount of work done by a force of 1 N on an object that displaces it through a distance of 1 m in the direction of the applied force.
Q.5: A pair of bullocks exerts a force of 140 N on a plough. The field being ploughed is 15 m long. How much work is done in ploughing the length of the field?
Ans : Work done by the bullocks is given by the expression: Work done = Force × Displacement W = F × d Where, Applied force, F = 140 N Displacement, d = 15 m W = 140 × 15 = 2100 J Hence, 2100 J of work is done in ploughing the length of the field.
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