Question

$\huge \colorbox{purple}{➠what \: is \: friction?}$
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Answer 1

Answer:

Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other. There are several types of friction: Dry friction is subdivided into static friction ("stiction") between non-moving surfaces, and kinetic friction between moving surfaces.

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Answer 2

$\huge\underbrace\mathscr\color{pink}{Friction}$

• The resistance from the contact surface between two solid materials caused by reciprocal movement is called as “friction”, the resistance force arising at that time is called “friction force”. 
• The friction force is classified into static friction and kinetic friction. The former is the resistance to initial movement, the latter refers to the resistance against motion. The greatest friction force is generated just before starting to move, as friction drag is the maximum static friction force.

We are able to stand on ground because of frictional force.