Physics Class 9 Practical 13 Important Viva Questions with Answers (Principle of Moments)

Practical 13

To find the weight of an unknown object by using principle of moments.

VIVA VOCE



1. What is the objective of this experiment?
 Ans: The objective is to find the weight of an unknown object using the principle of moments.

2. Describe the setup of this experiment.
 Ans: The setup typically involves a pivot point, a lever arm (such as a meter stick), and the unknown object suspended at a known distance from the pivot.

3. How does the principle of moments apply in this experiment?
Ans: The principle of moments states that for an object to be in equilibrium, the sum of the clockwise moments about any point must be equal to the sum of the anticlockwise moments about the same point. This principle is used to find the weight of the unknown object.

4. What measurements are needed for this experiment?
Ans: We need to measure the distance from the pivot point to the suspension point of the unknown object and any other weights used in the experiment.

5. How will you ensure the object is in equilibrium?
 Ans: We will adjust the positions of weights or the unknown object until the lever arm remains stationary and level, indicating that the moments are balanced.

6. What calculations are involved in determining the weight of the unknown object?
 Ans: We will calculate the moments produced by the weights and the unknown object about the pivot point and set them equal to find the unknown weight.

7. Why is it important to measure distances accurately?
 Ans: Accurate measurements ensure precise calculations of moments, which are essential for determining the weight of the unknown object.

8. How can you validate the results obtained from this experiment?
Ans: We can validate the results by repeating the experiment with different setups and comparing the calculated weights. Additionally, comparing the calculated weight with a known value, if available, can help validate the results.

9. What precautions will you take during the experiment?
Ans: Ensure the lever arm is level, the pivot point is stable, and all measurements are taken carefully to minimize errors.

10. What practical applications does the principle of moments have?
Ans: The principle of moments is widely used in engineering, architecture, and physics for designing structures, determining loads, and analyzing the balance of forces in various systems.

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