Practice Work Sheet For Class 8

 WORKSHEET

I. Fill in the blanks:

1.  Fluid friction is also called as___________.

2. Gases and liquids are called as ___________.

3. Aeroplanes are in the shape of birds to reduce ______________.

4. Friction produces __________.

5. Friction is reduced by using _____________.

6. If roughness increases ___________increases.

7. Friction is independent of ____________.

8. The frictional force exerted by fluids is also called________.

9. _______ is the friction which comes into play when the surface of one object moves relative to the surface of another object.

10. ________ is the friction which comes into play when surfaces of the objects are at rest relative to each other.

Select Appropriate Answers: static friction, sliding friction, fluids, friction, lubricants, drag, heat, area of contact.

II. Answer the following question:

11. Define Friction?

12. Define drag?

13. Write all types of frictions?

Tags:  friction, fluid friction, static friction, area of contact, heat sliding  friction, drag, lubricants,