- #1

Matej Pertot

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## Homework Statement

You need to derive a formula for undamped pendulum simple harmonic motion;

1. Starting from the middle point

2. Starting from the extreme point

## Homework Equations

The solutions are;

1. s = s0 sin(2 pi f t)

2. s = s0 cos(2 pi f t)

## The Attempt at a Solution

I can derive the first answer -- you have to imagine that it is similar to circular motion. But I have difficulties with the second question; I arrive at solution 1-cos(...) because - doesn't it knly move for the difference between radius (full amplitude) and cosine?