Look at a graph showing simple harmonic motion... you'll see
it.
View page
A simple pendulum exhibits simple harmonic motion
View page
by using the formula we will calculat time period of simple
harmonic motion
View page
A simple pendulum undergoes simple harmonic motion only for
small amplitudes because for small amplitudes the motion almost
reduces to a straight line motion. Simple harmonic motion means
motion on a straight not on curves
View page
Check out Wikipedia.org, "The World's Encyclopedia"