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Simple Harmonic Motion - Multiple Choice Questions

Q6. A simple pendulum and a mass-spring system are taken to the Moon, where the gravitational field strength is less than on Earth.

Which line, A to D, correctly describes the change, if any, in the period when compared with its value on Earth?

 
period of pendulum
period of mass-spring system
A
decrease
decrease
B
increase
increase
C
no change
decrease
D
increase
no change

 

For the pendulum g is inversely proportional to T2. Therefore if g decreased the period would increase.

The spring system's period does not depend on g. It depends on the mass (which is the same wherever the body is) and the spring constant. The spring constant depends on the internal arrangment of the spring's particles. That is unaltered by position in a graviational field.