Physics Class 9 Practical 6 Important Viva Questions with Answers (Limiting friction)

 PRACTICAL 6

Investigate the relationship between force of limiting friction and normal reaction to find the co-efficient of sliding friction between a wooden block and horizontal surface.

VIVA VOCE

1. What is the objective of investigating the relationship between the force of limiting friction and the normal reaction?
   - The objective is to determine the coefficient of sliding friction between a wooden block and a horizontal surface.

2. How do you set up the experiment to investigate this relationship?
   - Place the wooden block on a horizontal surface and gradually increase the applied force until the block just starts to slide. Measure the normal reaction force and the applied force at this point.

3. What is the normal reaction force, and how is it related to the weight of the wooden block?
   - The normal reaction force is the force exerted by the surface perpendicular to the contact surface. It is equal in magnitude and opposite in direction to the weight of the wooden block.

4. What is the significance of determining the coefficient of sliding friction?
   - The coefficient of sliding friction quantifies the resistance to motion between two surfaces in contact. It is a fundamental property used in various engineering and physics applications.

5. What formula relates the force of limiting friction, normal reaction, and coefficient of sliding friction?
   - The formula is \( F_{\text{friction}} = \mu \times N \), where \( F_{\text{friction}} \) is the force of limiting friction, \( \mu \) is the coefficient of sliding friction, and \( N \) is the normal reaction force.

6. How would you calculate the coefficient of sliding friction from the experimental data?
   - Divide the force of limiting friction by the normal reaction force.

7. What factors could affect the accuracy of the experiment?
   - Factors include irregularities on the surface, variations in the weight distribution of the wooden block, and fluctuations in applied force. Minimize these by using a smooth surface, ensuring uniform weight distribution, and taking multiple measurements.

8. How can you ensure that the wooden block is in a state of limiting friction during the experiment?
   - Gradually increase the applied force until the block just starts to slide. At this point, the force of friction equals the force applied, indicating limiting friction.

9. What safety precautions should be taken during the experiment?
   - Ensure the experiment area is clear of obstacles, handle equipment carefully to avoid injury, and wear appropriate personal protective equipment if necessary.

10. How would you interpret the relationship between the force of limiting friction and the normal reaction force?
    - The relationship should follow a linear trend, with the coefficient of sliding friction represented by the slope of the graph.


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