Physics Class 9 Practical 14 Important Viva Questions with Answers (simple pendulum)

PRACTICAL 14

To study the effect of the length of simple pendulum on time and hence find the value of g by calculation

VIVA VOCE



1. What is the objective of this experiment?
Ans: The objective is to study the effect of the length of a simple pendulum on its time period and to calculate the acceleration due to gravity (g).

2. Describe the setup of this experiment.
Ans: The setup typically involves suspending a small mass (pendulum bob) from a string of variable length and allowing it to oscillate freely.

3. How does the length of the pendulum affect its time period?
Ans: The time period of a pendulum is directly proportional to the square root of its length. Longer pendulums have longer time periods, and vice versa.

4. What measurements are needed for this experiment?
Ans: We need to measure the length of the pendulum and the time taken for a certain number of oscillations (usually a fixed number like 10 or 20).

5. How will you conduct the experiment to find the time period?
Ans: We will measure the time taken for a fixed number of oscillations and then calculate the time period by dividing the total time by the number of oscillations.

6. What equation relates the time period of a pendulum to its length?
Ans: The equation is \( T = 2\pi \sqrt{\frac{L}{g}} \), where T is the time period, L is the length of the pendulum, and g is the acceleration due to gravity.

7. How will you find the value of 'g' from the experiment?
Ans: By rearranging the equation for the time period, we can solve for 'g' using the measured time period and length of the pendulum.

8. What precautions will you take during the experiment?
Ans: Ensure the pendulum swings freely without any external disturbances, use a stopwatch with good precision, and measure the length of the pendulum accurately.

9. How can you ensure the accuracy of your results?
Ans: We can repeat the experiment multiple times and take the average of the results to minimize errors. Additionally, ensuring precise measurements and controlling variables will increase accuracy.

10. What real-world applications does understanding the behavior of pendulums have?
Ans: Pendulums have applications in various fields such as timekeeping (e.g., pendulum clocks), seismology (to detect earthquakes), and engineering (to control vibrations in structures). Understanding their behavior helps in designing and analyzing systems in these fields.

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