# Case Study Questions for Class 11 Physics Chapter 6 Work Energy and Power

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## Case Study Questions for Class 11 Physics Chapter 6 Work Energy and Power

Here we are providing case study questions for class 11 physics chapter 6 Work, Energy and Power. Students can practice these questions for better understanding of case study type questions.

Case Study Questions:

Question 1:

Potential Energy of Spring
There are many types of spring. Important among these are helical and spiral springs as shown in figure.

Usually, we assume that the springs are massless. Therefore, work done is stored in the spring in the form of elastic potential energy of the spring. Thus, potential energy of a spring is the energy associated with the state of compression or expansion of an elastic spring.

(i) The ratio of spring constants of two springs is 2 : 3. What is the ratio of their potential energy, if they are stretched by the same force?
(a) 2 : 3
(b) 3 : 2
(c) 4 : 9
(d) 9 : 4

(ii) The potential energy of a body is increases in which of the following cases?
(a) If work is done by conservative force
(b) If work is done against conservative force
(c) If work is done by non-conservative force
(d) If work is done against non- conservative force

(iii) The potential energy, i.e., U (x) can be assumed zero when
(a) x =0
(b) gravitational force is constant
(c) infinite distance from the gravitational source
(d) All of the above

(iv) The potential energy of a spring when stretched through a distance x is 10 J. What is the amount of work done on the same spring to stretch it through an additional distance x?
(a) 10 J
(b) 20 J
(c) 30 J
(d) 40 J