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D 12652 (Pages : 3) ಸ ರ ರರ ௧௨2௨ 2௧

FIRST SEMESTER (CBCSS—UG) DEGREE EXAMINATION
NOVEMBER 2021
Physics/Applied Physics
PHY 1B 01/APH 1B 01—MECHANICS—I
(2021 Admissions)
Time : Two Hours Maximum : 60 Marks
The symbols used in the question paper have their usual meanings.
Section A (Short Answer Type)

Answer at least eight questions.
Each question carries 3 marks.
All questions can be attended.

Overall Ceiling 24.

1. State Newton’s third law of motion and give various examples to illustrate it.
2. What are the fundamental forces in nature ? Compare their strengths.

3. State work-energy theorem for a conservative system. How does dissipative force modify the
description ?

4. Explain central force. Show that the work done by a central force is path independent.
5. Obtain the expression for change in acceleration due to gravity with height.
6. Define moment of inertia. How is it related to angular momentum ?

What are conservative forces ? Give examples.

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Show that angular momentum is conserved for a particle in central force motion.
9. Define centre of mass of a system of particles. Obtain an expression for it.

10. Define power of amechanical system. Calculate the expression for power of an object falling from
a height, assuming acceleration due to gravity is a constant.

11. State the law of conservation of linear momentum with one example.
12. State and explain parallel axis theorem.
(8 x 3 = 24 marks)

Turn over

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