
Aim: to investigate examples of Mechanical
Oscillations 
In all measurements of time period measure enough
oscillations to give reasonably accurate results (20 or
30 should do in most cases). 
Pendulum 
Make a Simple Pendulum as shown below: 

The time period of a pendulum is the time for one
oscillation. 
One oscillation is, for example, from A to B and
back to A. 

Find the time period of the pendulum under the
following conditions. 

length, L 
mass, m 
initial amplitude, r 
1. 
30cm 
20g 
(about) 2cm 
2. 
30cm 
20g 
(about) 4cm 
3. 
30cm 
50g 

4. 
60cm 




Let the time period of pendulum 3 be T_{1}
and that of pendulum 4 be T_{2} 
Calculate the ratio T_{2}/T_{1} 

How does the time period of a pendulum depend on 
 mass ? 
 initial amplitude ? 
 length ? 

Mass/Spring Oscillator 

Pull the mass down a short distance, r and release
it (r is the initial amplitude of the oscillations). 

Compare the time periods for initial amplitudes of r
and 2r, masses of m and 2m. 
Change the spring to a "stronger" or "weaker" one
(one having a larger or smaller elastic constant). 

How do these changes affect the time period of the
mass/spring oscillator? 