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• The force responsible for maintaining the S.H.M. is called restoring force.
If the displacement (x) from the equilibrium position is small, the restoring force (F) acting on the
body is given by
F = -kx
where k is a force constant.
• Energy in S.H.M.
When a body executes SHM, its energy changes between kinetic and potential, but the total
energy is always constant. At any displacement x from the equilibrium position:
