NCERT Solutions for Class 8 Science Chapter 12 Friction
NCERT solutions for class 8 science chapter 12 Friction: If you are a CBSE student in class 8, you may be one of those looking for solutions of NCERT class 8 chapter 12 friction. This is an important chapter for class 8 students. To score good marks, knowing the CBSE NCERT solutions for class 8 science chapter 12 friction would be an advantage. In this chapter, you will get to know the topics like forces of friction, factors affecting friction, why friction is necessary, what is increasing and decreasing friction, how wheels reduce friction, static friction, ball bearings, fluid friction, use of lubricants and more.
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You can also check the detailed NCERT solutions for class 8 science chapter 12 friction on this page. Other NCERT solutions for class 8 are also available to understand how to derive the answers to the various questions asked in each chapter and each exercise. This, in turn, will help in performing better in the exams and scoring very good marks. Now just that, a good understanding of the NCERT solutions for subjects science or maths will further aid in higher classes and entrance exams like JEE Main and NEET which are for engineering and medical courses respectively.
NCERT solutions for class 8 science chapter 12 friction: Solved Exercise Questions
Answer:
(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 less than the static friction.
(a) rolling, static, sliding
(b) rolling, sliding, static
(c) static, sliding, rolling
(d) sliding, static, rolling
Answer:
(c) is the correct arrangement.
Static friction > sliding friction > rolling friction.
(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
Answer:
The force of friction acting on the car on different surfaces in increasing order will be wet marble floor, dry marble floor, newspaper and towel. Therefore (a) is the correct answer.
Answer:
The frictional force will be opposite to the direction of motion
Answer:
It would make it more difficult for us to walk on the marble floor since the frictional force would further decrease and thus our grip on the floor while walking would become even lesser.
Q6. Explain why sportsmen use shoes with spikes.
Answer:
Sportsmen use shoes with spikes to increase the grip between their feet and the ground by increasing the friction with the help of spikes. This aids them while running on the ground.
Answer:
Seema would have to apply a larger force as she would have to overcome a greater frictional force. The frictional force between two surfaces exists due to the interlocking of the irregularities on the surface. The magnitude of this frictional force depends on how tight this interlocking is which in this case depends on the weight of the boxes which is more in case of Seema.
Q8. Explain why sliding friction is less than static friction.
Answer:
Sliding friction is less than static friction as the frictional force between two surfaces depends on the interlocking between the irregularities on the surfaces. This interlocking in case of sliding decreases as the contact points does not get enough time to interlock properly thus reducing the frictional force.
Q9. Give examples to show that friction is both a friend and a foe.
Answer:
Friction acting as a friend:
(a) It aids us to walk and cars to move on the roads.
(b)Fire can be ignited using friction.
Friction acting as a foe:
(a) It causes the efficiency of engines to decrease and also damages machinery.
(b) Friction causes soles of shoes and tires to wear off.
Q10. Explain why objects moving in fluids must have special shapes.
Answer:
When an object is moving through a liquid there is an opposing force offered by the liquid against the motion of the object. To reduce this opposing force object must have special shapes.
Friction Class 8 NCERT Science Chapter : Topics
- Force of friction
- Factors affecting friction
- Friction - a necessary evil
- Increasing and reducing friction
- Wheels reduce friction
- Fluid friction
- Ball Bearing
- Drag
- Fluid Friction
- Friction
- Interlocking
- Lubricants
- Rolling Friction
- Sliding Friction
- Static Friction
NCERT Solutions For Class 8 Science- Chapter-Wise
NCERT Solutions For Class 8: Subject-Wise
How to use chapter-wise NCERT solutions:
Now that the NCERT solutions for class 8 science chapter 12 friction are done on this page, it's time to move to other chapters and topics as well. The list is given above. All you need to do is click on the given link and the NCERT chapter with solutions to all exercises will be displayed. Use them to understand and solve to score more marks in your exam.
Also Check NCERT Books and NCERT Syllabus here:
Frequently Asked Question (FAQs) - NCERT Solutions for Class 8 Science Chapter 12 Friction
Question: What is the role of friction?
Answer:
Friction opposes the motion between the surfaces in contact with each other. If there is no frictional force we wont be able to walk.
Question: Is friction an important topic for higher studies?
Answer:
Yes, friction, force, motion and pressure are important topics that will be studied in Class 9 NCERT Science Syllabus and also in Class 11 NCERT Physics book
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