CBSE Class 8 Science Friction Notes

Download CBSE Class 8 Science Friction Notes in PDF format. All Revision notes for Class 8 Science have been designed as per the latest syllabus and updated chapters given in your textbook for Science in Class 8. Our teachers have designed these concept notes for the benefit of Class 8 students. You should use these chapter wise notes for revision on daily basis. These study notes can also be used for learning each chapter and its important and difficult topics or revision just before your exams to help you get better scores in upcoming examinations, You can also use Printable notes for Class 8 Science for faster revision of difficult topics and get higher rank. After reading these notes also refer to MCQ questions for Class 8 Science given on studiestoday

Revision Notes for Class 8 Science Chapter 12 Friction

Class 8 Science students should refer to the following concepts and notes for Chapter 12 Friction in Class 8. These exam notes for Class 8 Science will be very useful for upcoming class tests and examinations and help you to score good marks

Chapter 12 Friction Notes Class 8 Science

CBSE Class 8 Science Friction. Learning the important concepts is very important for every student to get better marks in examinations. The concepts should be clear which will help in faster learning. The attached concepts made as per NCERT and CBSE pattern will help the student to understand the chapter and score better marks in the examinations.

FRICTION

1. The force which always opposes the motion of one object over another object in contact with it, is called friction.

2. The force of friction always acts in a direction opposite to the direction in which an object moves (or tends to move).

3. Cause of friction : Friction is caused by the interlocking of irregularities in the surfaces of two objects which are in contact with each other. In order tomove one object over  ther, we have to apply force to overcome interlocking.

4. Factors affecting friction:

The friction between two surfaces depends on two factors:
· the nature of two surfaces (smoothness or roughness of the two surfaces)Mo re the roughness of a surface, larger is the number of irregularities on its surface & hence greater will be the friction.
· the force with which two surfaces are pressed together. Pressing together two surfaces of objectswith a greater force will increase the interlocking in the two surfaces& hence increase the friction.
NOTE: The force of friction does not depend on the ‘amount of surface area’ of two objects which is in contact with each other.

5. Friction is of three types:

(i) Static friction: The maximum frictional force present between two objects when one object just tends to move or slip over the surface of the other object. The object remains static in this case.

(ii) Sliding friction: The frictional force present when one object slides over the surface of another object are known as sliding friction. When the object starts sliding, the contact point on its surface, do not get enough time to lock into the contact points on the other object. So sliding friction is always less than static friction.

(iii) Rolling friction: When an object rolls over the surface of another object, then the frictional force that comes into picture is called rolling friction. Rolling friction is less than sliding friction.

NOTE: Static friction > Sliding friction > Rolling friction.

6. Friction is a necessary evil because in some cases, friction is useful & we want to keep it but in other cases friction is harmful.

7. Advantages of friction:

· It is the friction between the sole of our shoes & ground that enable us to walk without slipping.

· It is the friction between brake pad & rimthat prevents the wheel from moving ahead. Due to this, the running bicycle slows down & finally stops.

· Friction enables us to write on paper. It is due to the friction between tip of the pencil & paper that rubs off black graphite particles from the tip of the pencil which stick to the paper & leave black marks on paper. In case of smooth surface friction is not sufficient to rub off that black graphite.

· It is the friction between the surface of wall & nail which holds the nail Tightly in the wall.

· Friction enables us to light a matchstick. When we rub thematchstick against a rough surface, then friction between the tip of matchstick & rough surface produces heat, as a resultmatchstick catches fire.

Disadvantages of friction:

• Friction wears away the soles of our shoes.

• Due to friction between the surface of tyres & the surface of road, the tyres wear out gradually.

• Friction wears out the brake pads of vehicles gradually. As a result brake pads of cycles have to be replaced quite often.

• Friction wears out steps of staircases in foot over- bridges.

• Friction produces unwanted heat which can damage& reduce the efficiency of machines.

8. Methods of increasing friction:

• Grooves are made in the soles of shoes, treads aremade in the tyers of vehicles, spikes are made in the shoes of players to increase friction so as to provide a better grip on the ground.

• Gymnasts apply some coarse substance on their hands to increase friction for better grip.

Methods of reducing friction:

Friction can be reduced:

• By making the surface smooth by polishing.

• By applying lubricants (like oil or grease).

Applying oil or grease helps in avoiding interlocking between the two rubbing surfaces to a large extent. As a result friction is reduced.

• By using wheels to move objects.

• By using ball bearings between the moving parts of machines.

NOTE:

(i) In somemachines, it may not be advisable to use oil as lubricant. In such machines, an air cushion between the moving parts is used to reduce friction.

(ii) Friction can never be entirely eliminated.

9. Fluid friction

• Friction exerted by fluids ie gases or liquid is termed as fluid friction or drag.

• The magnitude of drag (fluid friction) depends on

• Speed of the object

• Shape of the object

• Size of the object

• Nature of fluid.

• When object moves through the fluids, they have to overcome friction acting on them. In this process they lose energy. Therefore efforts are being made to minimize energy by giving special shape to the objects called ‘streamlined shape’. That’s why cars, airplanes & rockets streamlined.


Please click the link below to download pdf file for CBSE Class 8 Science Friction.

Chapter 01 Crop Production and Management
CBSE Class 8 Science Crop Production And Management Notes
Chapter 02 Microorganisms: Friend or Foe
CBSE Class 8 Science Microorganism Friend Or Foe Notes
Chapter 03 Synthetic Fibres and Plastics
CBSE Class 8 Science Synthetic Fibres And Plastics Notes
Chapter 04 Materials Metals and Non-Metals
CBSE Class 8 Science Metal And Non Metals Notes
Chapter 05 Coal and Petroleum
CBSE Class 8 Science Coal And Petroleum Notes
Chapter 07 Conservation of Plants and Animals
CBSE Class 8 Science Conservation Of Plants And Animals Notes
Chapter 10 Reaching the Age of Adolescence
CBSE Class 8 Science Reaching The Age Of Adolescence Notes
Chapter 11 Force and Pressure
CBSE Class 8 Science Force And Pressure Notes
Chapter 14 Chemical Effects of Electric Current
CBSE Class 8 Science Chemical Effects of Electric Current Notes
Chapter 15 Some Natural Phenomena
CBSE Class 8 Science Some Natural Phenomena Notes
Chapter 17 Stars and the Solar System
CBSE Class 8 Science Stars and the Solar System
Chapter 18 Pollution of Air and Water
CBSE Class 8 Science Pollution of Air and Water Notes

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CBSE Class 8 Science Chapter 12 Friction Notes

We hope you liked the above notes for topic Chapter 12 Friction which has been designed as per the latest syllabus for Class 8 Science released by CBSE. Students of Class 8 should download and practice the above notes for Class 8 Science regularly. All revision notes have been designed for Science by referring to the most important topics which the students should learn to get better marks in examinations. Studiestoday is the best website for Class 8 students to download all latest study material.

Notes for Science CBSE Class 8 Chapter 12 Friction

Our team of expert teachers have referred to the NCERT book for Class 8 Science to design the Science Class 8 notes. If you read the concepts and revision notes for one chapter daily, students will get higher marks in Class 8 exams this year. Daily revision of Science course notes and related study material will help you to have a better understanding of all concepts and also clear all your doubts. You can download all Revision notes for Class 8 Science also from www.studiestoday.com absolutely free of cost in Pdf format. After reading the notes which have been developed as per the latest books also refer to the NCERT solutions for Class 8 Science provided by our teachers

Chapter 12 Friction Notes for Science CBSE Class 8

All revision class notes given above for Class 8 Science have been developed as per the latest curriculum and books issued for the current academic year. The students of Class 8 can rest assured that the best teachers have designed the notes of Science so that you are able to revise the entire syllabus if you download and read them carefully. We have also provided a lot of MCQ questions for Class 8 Science in the notes so that you can learn the concepts and also solve questions relating to the topics. All study material for Class 8 Science students have been given on studiestoday.

Chapter 12 Friction CBSE Class 8 Science Notes

Regular notes reading helps to build a more comprehensive understanding of Chapter 12 Friction concepts. notes play a crucial role in understanding Chapter 12 Friction in CBSE Class 8. Students can download all the notes, worksheets, assignments, and practice papers of the same chapter in Class 8 Science in Pdf format. You can print them or read them online on your computer or mobile.

Notes for CBSE Science Class 8 Chapter 12 Friction

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