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 mar