Question

a) Write the derived units of the following:

(i) speed (ii) force (iii) work (iv) pressure (2)

b) State the numerical value of the frequency of oscillation of a second’s pendulum.

Does it depend on the amplitude of oscillation? (2)

c) Name the physical quantities which are measured in the following units:

(i) u (ii) ly (iii) ns (iv) nm (2)

d) What do you understand by the term rest and motion? Support your answer by

giving two examples each. (2)

e) Draw a diagram to show the motion of a body whose speed remains constant but

velocity changes continuously.​

Answer 1

Answer:

a) (i) m/s (ii) n (iii) joule (iv) m^-1.kg.s^-2

b) The frequency of oscillation of a seconds' pendulum is 0.5 s−1. It does not depend on the amplitude of oscillation.

c) (i) mass (ii) length (iii) time (iv) strength

d) Rest: An object is said to be at rest if it does not change its position with respect to its surroundings with time.

Motion: An object is said to be in motion if the position changes with respect to it surrounding and time.

The examples of motion include: running, cycling, jumping, swimming, eating, drinking, playing, writing, typing, moving cars, throwing ball. The examples of rest include: sleeping, sitting, standing, staring, lying, a fixed clock, bottle kept on a table, a stopped car.

e) A body moving in a circular path having uniform speed is a true example where speed remains constant but velocity changes because every point, the direction changes at every point and is tangentially to the circular path.

diagram in image ...