Questions involving key terms
Answer these questions in your practical book.
Important, Standard Questions
| 1a) | What was the independent variable in your experiment? | 1 |
| 1b) | Explain what factors you considered in deciding the range of readings that you took. | 2 |
| 1c) | State the precision of the instruments you used. | 3 |
| 1d) | Based on the instrument precision, calculate the percentage errors in your largest and smallest readings. | 2 |
| 2a) | What did you do in this experiment to ensure your readings were valid? | 1 |
| 2b) | By inspection of the table and graph, comment on the reliability of the results. | 2 |
| 2c) | What could you have done to increase the reliability of the experiment? | 1 |
| Experiment-specific questions | ||
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Hooke's Law |
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| a) | Describe what your graph suggests about the tensile behaviour of your spring. | 3 |
| b) | Deduce the spring constant for your spring. | 3 |
| c) |
A student suggests that two springs end to end would have half the spring constant value of just one spring. Describe briefly how you could test this theory. |
3 |
| Determining g with a pendulum | ||
| a) | What is the relationship between the gradient of your graph, and g? | 2 |
| b) | Deduce the value of g. | 1 |
| c) | Whilst on the Apollo 12 mission, the astronauts who landed on the moon repeated this experiment. Which factor(s) would be different on the moon compared to the Earth. Will the time period be greater or less than that on Earth? | 2 |
| d) | A student suggests that a "swinging ship" ride at a theme park could also be used to determine g in a similar manner. Describe how you could test whether this is true. What precondition is required to ensure that it obeys SHM? | 4 |
| Determining k using a semi-conductor Diode | ||
| a) | What is the relationship between the gradient of your graph, and k | 2 |
| b) | Deduce the value of k. | 1 |
| c) | Instead consider that k is known to be 1.38x10-23JK-1mol-1, and T is unknown in Kelvin, but known in celsius. Using your answer to a), calculate the temperature you used to determine k, and hence determine the value of absolute zero (in celsius). | 3 |
| d) | Instead of varying the power supply, you are using a power source connected directly to a CONSTANT voltage supply. Describe a method which will still allow you to determine the value of k, without changing Vs. | 3 |
| Determining ή for a fluid. | ||
| a) | What is the relationship between the gradient of the graph, and ή | 2 |
| b) | Deduce the value of ή | 1 |
| c) | What is the resistive force of a person falling feet first to the ground, with a radius of 0.15m? If they have a mass of 100kg, what is their terminal velocity? (ήair is 10-3Pas) | 2 |
| d) | A student suggests that the value of ή will change depending on temperature. Develop a method which could be used to consider this hypothesis. | 4 |