Friction
Definition
Friction is a force that opposes relative motion between two surfaces in contact. It arises due to microscopic irregularities between surfaces and can cause objects to slow down or come to rest.
Analogy
Think of friction as trying to slide across a sandy beach while wearing socks. The sand particles create resistance against your movement, making it harder for you to slide smoothly. This resistance is similar to how friction works between surfaces.
Related terms
Static Friction: Static friction is the type of friction that prevents two stationary surfaces from sliding past each other when a force is applied.
Kinetic Friction: Kinetic friction occurs when two surfaces are already in motion relative to each other and experience resistance as they slide past each other.
Rolling Friction: Rolling friction is the type of friction that occurs when an object rolls over a surface, such as a ball rolling on the ground. It is generally lower than sliding friction.
"Friction" appears in:
Subjects (2)
Study guides (5)
Additional resources (2)
Practice Questions (2)
- A 3kg pendulum has a velocity of 3m/s at the bottom of its swing. What is the maximum height it reaches? Neglect air resistance and friction.
- Suppose an object experiences an initial torque of 15 N*m while lying down on a rough table. It stops spinning after making 1.5 revolutions. What is the work done by friction in bringing the object to rest?
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