Physics Class 9 Practical 8 Important Viva Questions with Answers (Value of g by Atwood Machine)

 PRACTICAL 8

To determine the value of 'g' by Atwood's Machine

VIVA VOCE

1.  What is the purpose of conducting the Atwood's machine experiment?
   Ans: The purpose is to determine the acceleration due to gravity (g) using the Atwood's machine setup.

2.  Describe the Atwood's machine setup.
 Ans: The Atwood's machine consists of a pulley with a string passing over it. Two masses of different weights are suspended on either end of the string.

3. How does the Atwood's machine work?
  Ans: When the masses are released, they experience a net force due to the difference in their weights. This causes an acceleration of the system.

4. What is the relationship between the masses and the acceleration in Atwood's machine?
   Ans: According to Newton's second law, the acceleration of the system is directly proportional to the net force acting on it, which is the difference in weights of the masses.

5.  How will you measure the acceleration in the Atwood's machine?
   Ans: We will measure the time taken for the masses to move a certain distance and use kinematic equations to calculate the acceleration.

6.What precautions will you take during the experiment?
 Ans: Ensure the pulley is frictionless, use masses with accurate weights, and make sure the string is parallel to the pulley axis to minimize errors.

7. How will you calculate the value of 'g' from the experiment?
Ans: We will use the formula \( g = \frac{4 \pi^2 d}{T^2 (m_1 + m_2)} \), where \( d \) is the distance between the masses and \( T \) is the period of oscillation.

8. Why is it important to take multiple readings?
 Ans: Multiple readings help to reduce random errors and provide a more accurate average value for 'g'.

9.  What factors might affect the accuracy of your results?
  Ans: Factors such as air resistance, friction in the pulley system, and inaccuracies in measuring equipment could affect the accuracy of the results.

10. What are the real-world applications of knowing the value of 'g'?
  Ans: The value of 'g' is crucial in various fields such as engineering, physics, and astronomy for designing structures, predicting motion, and understanding celestial mechanics.

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