Physics Class 9 Practical 7 Important Viva Questions with Answers (Limiting friction by rolling roller)

 PRACTICAL 7

Measure the force of limiting friction by rolling a roller on a horizontal plane

VIVA VOCE

1.  What is the objective of this practical?
   Ans: The objective is to measure the force of limiting friction by rolling a roller on a horizontal plane.

2. What equipment will you use for this experiment?
   Ans: We will use a roller, a horizontal plane, weights, a spring balance, and a marker.

3.  How will you set up the experiment?
   Ans: Place the roller on the horizontal plane and attach the spring balance to it. Add weights to the roller gradually until it starts to move. Mark the position where the roller begins to move.

4. What is limiting friction?
   Ans: Limiting friction is the maximum force of friction that can be exerted between two surfaces before motion starts.

5.  How will you calculate the force of limiting friction?
   Ans: The force of limiting friction will be equal to the weight applied to the roller when it just begins to move.

6.  Why is it important to mark the position where the roller starts moving?
   Ans: Marking the position helps us accurately measure the force of limiting friction without any errors due to variations in starting positions.

7. What precautions will you take during the experiment?
   Ans: Ensure the roller and the surface are clean and free from any contaminants. Apply weights gently and avoid sudden movements to prevent inaccuracies.

8.  How will you ensure the accuracy of your results?
   Ans: We will repeat the experiment multiple times and take the average of the readings to minimize errors. We will also ensure that all equipment is calibrated properly.

9.  What factors might affect the force of limiting friction?
   Ans: Factors such as surface roughness, the weight of the roller, and the material of the roller and the surface could affect the force of limiting friction.

10.  What are the potential applications of understanding limiting friction?
    Ans: Understanding limiting friction is essential in various fields like engineering, transportation, and construction to ensure the stability and safety of structures and machinery.

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