give me list of all the friction we have to study.

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karanjha96 | Student, Grade 9 | eNotes Newbie

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There are two types of frictions

1. static friction

2. kinetic(sliding) friction.

The force of friction that comes into play between the surfaces of two bodies, before the body starts moving, is known as static friction. The force of friction acting between two surfaces, when one surface moves with a constant speed over another surface, it is called sliding friction.