A2 EMPA practice questions and sample results
Section 2
|
l /m
|
h /m
|
h /m
|
h /m
|
Mean h /m
|
|
0.860
|
0.370
|
0.365
|
0.375
|
|
|
0.801
|
0.503
|
0.504
|
0.492
|
|
|
0.724
|
0.668
|
0.673
|
0.672
|
|
|
0.651
|
0.809
|
0.812
|
0.808
|
|
|
0.553
|
0.945
|
0.946
|
0.949
|
|
- Calculate the means and add to the table.
- For the largest value of l what is the range of h ?
- For the largest value of l what is the percentage uncertainty of h ?
- For the smallest value of l what is the uncertainty of h ?
- For the smallest value of l what is the percentage uncertainty of h ?
- Draw a graph of your results on the grid provided.
- What is the pattern shown by these results, and how accurate are they? How do you know?
- What are the main sources of uncertainty in this experiment?
- What equations describe the energy changes involved in this experiment?
- A pendulum swings from a support post and another post is added to interrupt its swing. We desire to know the maximum height at which the pendulum will perform a full loop around the post. The pendulum requires both potential and kinetic energy in order to complete a full loop. Therefore, it will never be able to return to its height of release while completing a full loop. Ultimately, the pendulum has enough energy to complete a full loop when interrupted at a height equal to two-fifths its initial height of release.
- How could you use your data to verify the above statement?
- A student performs a similar experiment but instead measures the maximum height the pendulum reaches once it hits the rod and swings around it. What would you expect the student to find?
- Which of your measured values could you use to verify this relationship?
- Describe the motion of the pendulum on each side of the rod.
- What is the gradient of the graph of the above results?
- What does this gradient represent?
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