CBSE Class 8 Science Friction Worksheet

Read and download free pdf of CBSE Class 8 Science Friction Worksheet. Students and teachers of Class 8 Science can get free printable Worksheets for Class 8 Science Chapter 12 Friction in PDF format prepared as per the latest syllabus and examination pattern in your schools. Class 8 students should practice questions and answers given here for Science in Class 8 which will help them to improve your knowledge of all important chapters and its topics. Students should also download free pdf of Class 8 Science Worksheets prepared by teachers as per the latest Science books and syllabus issued this academic year and solve important problems with solutions on daily basis to get more score in school exams and tests

Worksheet for Class 8 Science Chapter 12 Friction

Class 8 Science students should refer to the following printable worksheet in Pdf for Chapter 12 Friction in Class 8. This test paper with questions and answers for Class 8 will be very useful for exams and help you to score good marks

Class 8 Science Worksheet for Chapter 12 Friction

Friction

Question 1. Fill in the blanks.
 
(a) Friction opposes the motion between the surfaces in contact with each other.
 
(b) Friction depends on the nature of surfaces.
 
(c) Friction produces heat.
 
(d) Sprinkling of powder on the carrom board reduces friction.
 
(e) Sliding friction is lesser than the static friction.
 
Question 2. Four children were asked to arrange forces due to rolling, static and sliding frictions in a decreasing order. Their arrangements are given below. Choose the correct arrangement.
(a) rolling, static, sliding
(b) rolling, sliding, static
(c) static, sliding, rolling (✓)
(d) sliding, static, rolling
 
Question 3. Alida runs her toy car on dry marble floor, wet marble floor, newspaper and towel spread on the floor. The force of friction acting on the car on different surfaces in increasing order will be:
(a) wet marble floor, dry marble floor, newspaper and towel. (✓)
(b) newspaper, towel, dry marble floor, wet marble floor.
(c) towel, newspaper, dry marble floor, wet marble floor.
(d) wet marble floor, dry marble floor, towel, newspaper
 
Question 4. Suppose your writing desk is tilted a little. A book kept on it starts sliding down. Show the direction of frictional force acting on it.
Answer- Frictional force will act upward i.e. direction opposite to that of sliding book.
 
Question 5. You spill a bucket of soapy water on a marble floor accidently. Would it make it easier or more difficult for you to walk on the floor? Why?
Answer- It is difficult to walk on a soapy floor because soapy floor applies very less friction and hence we can slip on such floor.
 
Question 6- Explain why sportsmen use shoes with spikes.
Answer- Sportsmen use shoes with spikes because these shoes give them a better grip while running. This is
because the force of friction between the shoes and the ground increases with the help of spikes.
 
Question 7. Iqbal has to push a lighter box and Seema has to push a similar heavier box on the same floor. Who will have to apply a larger force and why?
Answer- Seema will have to apply larger force, as heavy box interlock with ground to much extent. So heavy box have large force of friction.
 
Question 8. Explain why sliding friction is less than static friction Answer- A bucket filled with water held above the ground experiences two types of forces:
Answer- When an object has already started moving (sliding), the irregularities on its surface do not get enough time to lock into the irregularities on the surface of the other object completely. Therefore, the sliding friction is less than the static friction.
 
Question 9. Give examples to show that friction is both a friend and a foe.
Answer-  Advantages of the friction: 
a) Due to friction, we are able to walk.
b) We are able to write because of the friction between the tip of the pen and paper.
Disadvantages of friction:
a) Because of friction, the tires and soles of shoes wear out.
b) Friction produces heat between different parts of the machines. This can damage the machines. 
 
Question 10- Explain why objects moving in fluids must have special shapes.
Answer- This frictional force by fluid on a moving body in it, depends on the shape of the body. By giving the objects a special shape, the force of friction acting on it can be minimized. Hence, it becomes easier for a body to move through the fluid. 
 
ONE MARK MCQs 
 
1. Why is it difficult to walk on a smooth and wet floor? 
A. Due to more friction
B. Due to very less friction (✓)
C. Due to gravity D. None 
 
2. Frictional Force always acts in _________ direction? 
A. Upward
B. Direction of motion of object 
C. Downward
D. Direction opposite to the motion of the object (✓) 
 
3. Spring Balance is used to measure________? 
A. Direction of the force B. Density 
C. Force of gravity acting on a body (✓)
D. None 
 
4. Frictional Force Depends on ________. 
A. Speed of the object
B. Smoothness of the surface 
C. Roughness of the surface
D. B and C both (✓) 
 
5. Frictional Force is produced because of _________? 
A. Irregularities in two contacting surfaces. (✓)
B. To stop moving object 
C. To make an object move easily
D. None 
 
6. Why grooves are made in tyres?
A. To reduce friction
B. To increase friction. (✓)
C. To make the tyres look beautiful
D. To reduce consumption of fuel.
 
7. Why rolling friction is less than the sliding friction?
A. Direction of frictional force changes
B. Moving object becomes lighter
C. Because it is easier for a body to roll over another in comparison to slide (✓)
D. All of above.
 
8. Name the system which converts sliding friction to rolling friction?
A. Ball bearing (✓)
B. Airplane
C. Bus
D. None
 
9. Friction produces ________
A. Cooling
B. Ice
C. Steam
D. Heat (✓)
 
10. Why talcum powder is spread on the carrom board?
A. To reduce friction
B. To make the surface of carrom board smooth
C. To make the carrom coins (goti) move longer distance
D. All of the above. (✓)
 
11. What are factors responsible for friction?
A. Nature of surface in contact
B. Area of contact
C. The force with which both surfaces are pressed
D. All (✓)
 
12. Friction is not useful for us, why?
A. It causes wear and tear
B. Loss of energy
C. The heat produced during friction destroys the machine
D. All (✓)
 
13. Why the shapes of objects moving in fluids (air and water) are streamlined?
A. To reduce the friction (✓)
B. To increase the friction.
C. To make it look beautiful
D. None
 
14. _______ is used to reduce the friction in moving parts of the machines
A. Oil or grease (✓)
B. Sand
C. Water
D. Petrol
 
15. What are the factors on which the friction produced in fluids depends?
A. Nature of object
B. Shape of the object (✓)
C. Speed
D. All
 
16. Friction is useful for us, how?
A. It helps us in walking
B. To apply brakes
C. To run machines and motors
D. All (✓)
 
17. Four students were asked to arrange the forces due to static friction, rolling friction and sliding friction in decreasing order?
A. Rolling, sliding, static
B. Rolling, Static, sliding
C. Static, sliding, rolling (✓)
D. Sliding, static, rolling
 
18. It is difficult to walk on ice because of less _________?
A. Gravitational force
B. Frictional force (✓)
C. Weight of ice D. None
 
19. Why tyres are made circular?
A. Because rolling friction is less than sliding friction (✓)
B. To look beautiful
C. Because rolling friction is more than sliding friction
D. None
 
20. Soles of our shoes wear out because of ________?
A. Running
B. Slow moving
C. Friction (✓)
D. None

 

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Q1 Fill in the blanks:

i) Force acting on a body can be measured by a -----------------.

ii) Friction is caused by the -------- on the two surfaces in contact

iii) Frictional force exerted by fluids is also called -------------

iv) The frictional force on an object in a fluid depends on its -------,----------- and----------------.

v) ---------------- can be used to reduce friction

vi) ---------is also produced with friction.

vii) Shape of the objects moving in the fluid is ------ to overcome friction exerted by liquids.

viii)------- are used in the machines to protect their surfaces from wear due to friction.

ix) Soapy floor is slippery due to -------- friction.

x)Ball bearing are used to convert static friction into ----- friction.

Q2 Why is it difficult to walk on a smooth and wet floor?

Q3 Why front portion of an aeroplane has a spherical shape or is streamlined?

Q4 On what principle do ball bearings work?

Q5 Give constrction and working of a spring balance. Draw the diagram also.

Q6 “ force of friction is much greater on a rough surface”

Q7 Give some advantages of friction.

Q8 Writ e two advantages of rolling friction.

Q9 Mention two ways to reduce friction?

Q10 differentiate between static and sliding friction.

Q 11 a) Two objects, A and B, one over the other, are moving with the same velocity.

Which of the following statements is correct?

A) Friction on A is in the forward direction.

B) Friction on A is in the backward direction.

C) Friction on B is in the forward direction.

D) No friction acts between A and B.

b) When we rub our palms together vigorously, they become warm because muscular energy is converted into heat energy due to the friction between the palms.
A) True
B) False

Q. 12 What kind of tyres are used in the racing cars and why?

1. What is spring balance?

2. Name two objects having streamlined body to reduce friction.

3. Differentiate between :

a. Sliding Friction and Static Friction.

b. Rapid Combustion and Spontaneous Combustion.

4. Give reasons.

a. The tyres of vehicles are made with grooves.

b. All machines in industries and factories need to be lubricated regularly.

c. Bodies of aeroplanes are streamlined.

5. What are the necessary conditions for the combustion to take place.

6. Kapil burnt a piece of coal and paper separately. He observed that the paper burnt with a flame while the piece of coal burnt without a flame. Why is it so?

7. Why should fossil fuels be used judiciously?

Chapter 01 Crop Production and Management
CBSE Class 8 Science Crop Production And Management Worksheet
Chapter 02 Microorganisms: Friend or Foe
CBSE Class 8 Science Micro Organisms Friend And Foe Worksheet
Chapter 03 Synthetic Fibres and Plastics
CBSE Class 8 Science Synthetic Fibers And Plastics Worksheet
Chapter 04 Materials Metals and Non-Metals
CBSE Class 8 Science Materials Metals And Non Metals Worksheet
Chapter 05 Coal and Petroleum
CBSE Class 8 Science Coal And Petroleum Worksheet
Chapter 06 Combustion and Flame
CBSE Class 8 Science Combustion And Flame Worksheet
Chapter 07 Conservation of Plants and Animals
CBSE Class 8 Science Conservation Of Plants And Animals Worksheet
Chapter 08 Cell Structure and Functions
CBSE Class 8 Science Cell Structure And Functions Worksheet
Chapter 09 Reproduction in Animals
CBSE Class 8 Science Reproduction In Animals Worksheet
Chapter 10 Reaching the Age of Adolescence
CBSE Class 8 Science Reaching The Age Of Adolescence Worksheet
Chapter 11 Force and Pressure
CBSE Class 8 Science Force And Pressure Worksheet
Chapter 12 Friction
CBSE Class 8 Science Friction Worksheet
Chapter 13 Sound
CBSE Class 8 Science Sound Worksheet
Chapter 14 Chemical Effects of Electric Current
CBSE Class 8 Science Chemical Effect Of Electric Current Worksheet
Chapter 15 Some Natural Phenomena
CBSE Class 8 Science Some Natural Phenomena Worksheet
Chapter 16 Light
CBSE Class 8 Science Light Worksheet
Chapter 17 Stars and the Solar System
CBSE Class 8 Science Stars And The Solar System Worksheet
Chapter 18 Pollution of Air and Water
CBSE Class 8 Science Pollution Of Air And Water Worksheet
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Worksheet for CBSE Science Class 8 Chapter 12 Friction

We hope students liked the above worksheet for Chapter 12 Friction designed as per the latest syllabus for Class 8 Science released by CBSE. Students of Class 8 should download in Pdf format and practice the questions and solutions given in the above worksheet for Class 8 Science on a daily basis. All the latest worksheets with answers have been developed for Science by referring to the most important and regularly asked topics that the students should learn and practice to get better scores in their class tests and examinations. Expert teachers of studiestoday have referred to the NCERT book for Class 8 Science to develop the Science Class 8 worksheet. After solving the questions given in the worksheet which have been developed as per the latest course books also refer to the NCERT solutions for Class 8 Science designed by our teachers. We have also provided a lot of MCQ questions for Class 8 Science in the worksheet so that you can solve questions relating to all topics given in each chapter.

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