What is Friction? Definition, Meaning & Example
A force that opposes motion between two surfaces in contact.
TL;DR: A force that opposes motion between two surfaces in contact.
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Friction: A force that opposes motion between two surfaces in contact.
Explanation
Friction arises from the interaction between surfaces and always opposes relative motion. Types include static friction (prevents motion) and kinetic friction (during motion). Friction depends on the normal force and the nature of surfaces. While friction can be disadvantageous in machines, it is essential for walking and gripping. Friction converts kinetic energy into heat.
Example
Sliding a book across a table experiences friction that gradually slows it down and eventually stops it.
Frequently Asked Questions
What are the types of friction?
Static friction prevents motion, kinetic friction acts during motion, and rolling friction acts on rolling objects.
Is friction always harmful?
No, friction is harmful in some contexts like machinery but essential for walking, gripping, and braking.
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