Physics Class 9 Practical 12 Important Viva Questions with Answers (Vector addition)

PRACTICAL 12

 To find the weight of an unknown object by using vector addition of forces.


VIVA VOCE

1.  What is the objective of this experiment?
   Ans: The objective is to find the weight of an unknown object by using vector addition of forces.

2. Describe the setup of this experiment.
  Ans: The setup involves suspending the unknown object from a support and attaching known weights to it. Strings are used to hang the weights, and their tensions are measured.

3.  How does vector addition of forces help in finding the weight of the unknown object?
   Ans: By applying known weights to the unknown object and measuring the tensions in the strings, we can use vector addition to find the resultant force, which represents the weight of the object.

4. What principle governs the vector addition of forces in this experiment?
   Ans: The principle of vector addition states that the resultant force of two or more forces acting on an object can be found by summing the individual forces as vectors.

5.  How will you measure the tensions in the strings?
  Ans: We will use a spring balance or a force sensor to measure the tensions in the strings holding the known weights.

6.  Why is it important to ensure the object is in equilibrium?
  Ans: Ensuring the object is in equilibrium ensures that the forces acting on it are balanced, allowing us to accurately calculate the weight of the object.

7.  What precautions will you take during the experiment?
   Ans: Ensure the support is stable, use calibrated equipment for measurements, and make sure the strings are taut and free from any slack.

8.  How will you calculate the weight of the unknown object?
   Ans: We will calculate the weight of the unknown object by summing the tensions in the strings holding the known weights, which will be equal to the weight of the unknown object.

9.  How can you verify the accuracy of your results?
   Ans: We can verify the accuracy by repeating the experiment, ensuring consistent measurements, and comparing the calculated weight with a known value if available.

10.  What real-world applications does this experiment have?
    Ans: This experiment simulates scenarios in engineering and physics where the weight or force acting on an object needs to be determined accurately, such as in structural analysis, load-bearing calculations, and material testing.

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