1) Testing to see whether mass is a contributing factor.
Prediction:
In theory, adding additional to the pendulum will make it drop quicker, however, this also mean it will rise slower, therefore not changing the resultant time.
Apparatus:
- Retort stand
- Clamp
- Cork
- String (25cm long)
- Pendulum mass (Approximately 15g)
- Plastersene
- Electronic timer
Diagram:
Method:
- Time how long it will take to complete ten oscillations normally.
- Without changing any other variables, adjust mass by adding 10g of plastersene.
- Record results, adding an additional 10g more of plastersene, repeat five times.
Results:
Conclusion:
Looking at the results, the range is from 11.19 – 11.37. Here is no great difference and is likely to be our mistake as the results don’t descend or ascend in any order at all.
Also mass doesn’t have anything to do with the formula, T=π√l/g.
My prediction is correct.
2) Testing to see whether the angle of the swing is a key point
Prediction:
I predict if we drop the pendulum fairly high, it will travel faster, but will have a longer distance to travel. Therefore there will be no change in time.
Apparatus:
- Retort stand
- Clamp
- Cork
- String (25cm long)
- Pendulum mass (Approximately 15g)
- Protractor
- Electronic timer
Diagram
Method:
- To start off, drop the pendulum at a small angle
- Increase angle by intervals of 10 degrees.
- Record the results each time.
Results
Conclusion
There is a slight increase in time when the angle is bigger; however, there shouldn’t be a change. This may due to length of string being small. If you pull back twice as much, then the gravitational pull also doubles, therefore not affecting the resultant time.
3) Testing length to see if it affects time
Prediction:
I predict that if the length of the string is of a larger length, then it will swing slower
