CLASS 8 Chapter 12 Friction

Short answer type questions

Question 1. How does friction act upon an object?

Question 2. Why soles of our shoes are grooved?

Question 3. Why do kabaddi players rub their hands with the soil?

Question 4. What are lubricants?

Question 5. Write some of the ways to reduce friction.

Question 6. What is the importance of friction?

Question 7. What is static friction?

Question 8. List some actions in which rolling friction exerts.

Question 9. Why ball bearings are used in many machines?

Question 10. Why the shape of an airplane is similar to the bird?

Long answer type questions

Question 1. Explain the following

1. Static friction
2. Sliding friction
3. Rolling friction

Question 2. What do understand by interlocking?

Question 3. What are the factors affecting friction?

Question 4. Why friction is considered a necessary evil?

Question 5. What are the disadvantages of friction?

Question 6. What do you understand by fluid friction?