CLASS 6 · LEARNING KNOWLEDGE
Friction and Surfaces – Basic Principles
How it works
Friction is a force between surfaces in contact. It opposes relative motion or the tendency toward such motion. Static friction prevents a body from beginning to slide, and sliding friction acts when two surfaces slide past each other. The strength of friction depends on the materials, the surface texture, and the contact force. Smooth surfaces often lead to less friction than rough ones. Friction is important in everyday life, e.g. when walking, braking, or writing.
Note
The frictional force depends on the nature of the surfaces and the contact force. It opposes relative motion or impending sliding and can often be reduced, e.g. by smoothing, lubricating, or rolling.
The frictional force depends on the nature of the surfaces and the contact force. It opposes relative motion or impending sliding and can often be reduced, e.g. by smoothing, lubricating, or rolling.
An example
Which statement best describes why one slips easily on ice?
Ice has a very smooth surface, which means the friction between the shoe sole and the ice is low. As a result, there is a lack of grip and one slips easily.
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50 Exercises
To the learning unit →Own explanation and own practice exercises by AmyMath. Subject reference framework: Physics. The topic assignment may vary by federal state.