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friction at the instant an object starts moving from rest is a measure of static friction. On the other hand, the force required to keep the object moving with the same speed is a measure of sliding friction. friction and you find it somewhat easier to move the box already in motion than to get it started. 12.3 Friction : A Necessary Evil
NCERT Book Class 8 Science Chapter 9 Friction is here. You can read and download Class 8 Science Chapter 9 PDF from this page of aglasem.com. Friction is one of the many lessons in NCERT Book Class 8 Science in the new, updated version of 2023-24.
Students can find NCERT Class 8 Science Chapter 12 Friction textbook from most of the local stationery for a very minimal amount of rupees. But for the help of students NCERT releases the Class 8th NCERT books in PDF for free of cost. You can download NCERT Class 8th books 2020-21 from the below-given link.
This force is called the force of friction. (a) Fig. 9.2 (a), (b) : (b) Friction opposes relative motion between the surfaces of the book and the table. You saw that if you apply the force along the left, friction acts along the right. If you apply the force along the right, the friction acts along the left direction.
1. Whenever the surfaces in contact tend to move or move with respect to each other, the force of friction comes into play. (a) only if the objects are solid. (b) only if one of the two objects is liquid. (c) only if one of the two objects is gaseous.
NCERT PDF for Class 8 Science Chapter 9: Friction are given here to help students prepare for the 2024-2025 exams. Click now to download Chapter 9: Friction the Free PDF of NCERT Class 8 Science.
Grade 08. Topics to be Covered. Introduction to Friction. Causes of Friction. 2.1 Interlocking of Irregularities. 2.2 Bond Formation. Factors affecting Friction. 3.1 Nature of Surfaces. 3.2 Pressing Force. Types of Friction. 4.1 Static Friction. 4.2 Sliding Friction. 4.3 Rolling Friction. 4.4 Comparison of Types of Friction. Topics to be Covered.
