Question

what is the relation between of normal force and frictional force​

Answer 1

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Static friction magnitude is directly proportional to the normal force magnitude and the roughness between the sliding surfaces. The coefficient of friction is the ratio of the magnitude of frictional force divided by the normal force magnitude.

Answer 2

${\huge {\underline {\purple {\mathbb{ANSWER}}}}}$

Static friction magnitude is directly proportional to the normal force magnitude and the roughness between the sliding surfaces. The coefficient of friction is the ratio of the magnitude of frictional force divided by the normal force magnitude.