CBSE Worksheet for Chapter - 3 Friction Class 8

CBSE Worksheet for Chapter - 3 Friction Class 8

Worksheets For class 8

Find CBSE Worksheet for chapter-3 Friction class 8

1. CLASS-8
2. BOARD: CBSE
3. PHYSICS Worksheet - 3
4. TOPIC: Friction
5. For other CBSE Worksheet for class 8 Science check out main page of Physics Wallah.

SUMMARY

• Friction – Definition and Causes, Types of friction – Static, Kinetic and Rolling friction
• Advantages and disadvantages of friction, Need of friction
• Ways to reduce & increase friction
• Friction due to liquids & gases

SECTION 1 – OBJECTIVE

1. A force that opposes the motion of one surface sliding over another is called:
   1. Lubrication
   2. Ball bearing
   3. Friction
   4. Polishing
2. Ball bearings are used to:
   1. Decrease friction
   2. Decrease surface area
   3. Increase friction
   4. Increase surface area
3. Giving shape to a body such that it offers the least resistance to the air or water is called:
   1. Pipelining
   2. Smoothening
   3. Streamlining
   4. Treading
4. Lubricants are used to:
   1. Reduce friction
   2. Increases friction
   3. Make a surface oily
   4. Make a surface shiny
5. When a bicycle travels on a rough surface, its speed:
   1. Increases
   2. Decreases
   3. Remains unchanged
   4. None of these
6. If we polish the two surfaces which are in contact with each other, frictional force acting on them will:
   1. Increase
   2. Decrease
   3. Remain same
   4. Nothing can be said
7. In which of the following situations friction is disadvantageous:
   1. Walking on a road
   2. Riding a car
   3. Sliding a box
   4. Brushing our teeth
8. Choose the correct option
   1. Rolling friction< limiting friction< sliding friction
   2. Rolling friction < static friction < sliding friction
   3. Sliding friction < static friction < limiting friction
   4. Limiting friction < rolling friction < sliding friction
9. What type of frictional force comes into play when wheat is grinded in flourmill?
   1. Rolling friction
   2. Sliding friction
   3. Static friction
   4. Composite friction
10. Brake of automobiles do not work well during rainy season because:
    1. Water acts as a lubricant between wheel drum and brake shoe
    2. Water destroys the wheel drum
    3. We can’t apply much force on brakes during rainy season
    4. All are correct

SECTION 2 – SUBJECTIVE

What are the main factors on which friction depends ?

1. Give some methods of increasing friction
2. Why is friction caused ?
3. Give 2 examples of friction due to water and air.
4. Why is friction considered a necessary evil?

Solutions: to worksheet-3 Topic- Friction

objective