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FIRST SEMESTER (CBCSS-UG) DEGREE EXAMINATION
NOVEMBER 2021
Physics/Applied Physics
PHY 1B 01/APH 1B 01—MECHANICS—I
(2020 Admissions)
Two Hours Maximum : 60 Marks
The symbols used in the question paper have their usual meanings.
Section A (Short Answer Type)

Answer all questions in two or three sentences.

Each correct answer carries amaximum of 2 marks.
With proper examples define contact forces.
Explain Fictious or Pseudo force.
Explain the gravitational force of a sphere.
Draw the force diagram for the “Dangling rope” and find the tension a distance x from the bottom.
State the law of conservation of linear momentum with one example.
Define conservative and non-conservative forces. Give examples of each.
State and explain the work energy theorem.
Draw the energy diagram for a harmonic oscillator and explain.
Define power with its various units.
Explain torque and compare with force.
State and explain parallel axis theorem.
Sketch and deduce an equation for the period of a Simple Pendulum.
(Ceiling 20 marks)
Section B (Paragraph / Problem type)

Answer all questions in a paragraph of about half a page to one page.
Each correct answer carries a maximum of 5 marks.

Astring of mass m attached to a block of mass M is pulled with force F. Neglect gravity. What is the
force F, on the block due to the string ?

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