What provides the restoring force for simple harmonic oscillations in the following cases? (i)simple pendulum (ii) spring (iii) column of mercury in U tube.

What provides the restoring force for simple harmonic oscillations in

1.	What provides the restoring force for simple harmonic oscillations in the following cases? (i)simple pendulum (ii) spring (iii) column of mercury in U tube.
Answer» SOLUTION :WEIGHT of DIFFERENCE COLUMN