Answer to Question #29479 in Mechanics | Relativity for hemaranjani

Question

what is static friction?

Answer 1

Static friction ("stiction") is the friction between non-moving surfaces. Any solid objects pressing against each other (but not sliding) will require some threshold of force parallel to the surface of contact in order to overcome static cohesion. Stiction is a threshold, not a continuous force. Stiction is also the same threshold at which a rolling object would begin to slide over a surface rather than rolling at the expected rate (and in the case of a wheel, in the expected direction).