To investigate whether the change of length of the string is proportional to the time of a swing of a simple pendulum.

Physics Investigation

Aim

The aim of my experiment is to investigate whether the change of length of the string is proportional to the time of a swing of a simple pendulum.

A simple pendulum can be defined s an object which is suspended by a light, inextensible thread from a fixed point, allowing the pendulum to oscillate. The time required for one complete oscillation is known as the period of a pendulum (T). Time of a swing of a pendulum is affected by the length of the thread and the angle that the pendulum is released at.

Prediction

I predict that the increase in the length will lead to increase in the time it takes the ball to swing. This occurs because the by increasing the length of thread you are increasing the arc, that the ball has to travel along.

Time of a swing of the pendulum is proportional to the square root of length.

T=√length

Method

In this experiment I will use 3 stopwatches, a protractor, a stand, a lead ball, a 1m ruler, a clamp and 100cm thread. The experiment is setup as follows:

1. Prepare the materials needed.
2. Setup a pendulum as shown in the diagram.
3. Raise the string to 90° and release it while timing.
4. Stop the timer after 4 complete oscillations are achieved.
5. Average and record the timing.
6. Change the length of the rope according to ...