Physics Class 9 Practical 5 Important Viva questions with Answers (Value of g free fall method)

 PRACTICAL 5

To find the value of “g” by free fall method

VIVA VOCE

1. What is the purpose of the free fall method in finding the value of "g"?
   - The purpose is to experimentally determine the acceleration due to gravity, denoted by "g."

2. How do you set up the experiment for the free fall method?
   - Drop a small object from a known height and measure the time it takes to fall using a stopwatch.

3. What precautions should be taken during the experiment to ensure accurate results?
   - Ensure the experiment is conducted in a vacuum or an environment with minimal air resistance, use a precise stopwatch, and repeat the experiment multiple times to reduce errors.

4. How do you measure the height from which the object is dropped?
   - Measure the height using a meter stick, ruler, or another measuring device with precision.

5. What is the equation used to calculate the acceleration due to gravity (g) using the free fall method?
   - \( g = \frac{{2h}}{{t^2}} \), where \( h \) is the height and \( t \) is the time taken for the object to fall.

6. What data do you need to collect during the experiment?
   - The height from which the object is dropped and the time it takes for the object to fall.

7. How can you ensure accurate timing during the experiment?
   - Use a precise stopwatch and start the timer exactly when the object is released and stop it as soon as the object hits the ground.

8. What factors might affect the accuracy of the results, and how can you mitigate them?
   - Air resistance, variations in the surface where the object falls, and inaccuracies in measurement. Minimize these by conducting the experiment in a controlled environment and using precise instruments.

9. Why is it important to repeat the experiment multiple times?
   - Repeating the experiment helps to reduce random errors and provides a more accurate average value for "g."

10. How would you validate the obtained value of "g"?
    - Compare the experimental value with the theoretical value of \( 9.81 \, \text{m/s}^2 \), and ensure that the result falls within an acceptable range of deviation.

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