CK-12 Basic Physics - Second Edition by CK-12 Foundation

Author:CK-12 Foundation
Language: eng
Format: epub
Publisher: CK-12 Foundation

When the 20 kg box to the right is pulled with a force of 100 N, it just starts to move (i.e. the maximum value of static friction is overcome with a force of 100 N). What is the value of the coefficient of static friction, ?

A different box, this time 5 kg in mass, is being pulled with a force of 20 N and is sliding with an acceleration of . Find the coefficient of kinetic friction, .

Every day Fakir likes to spend about an hour meditating on his bed of nails. Fakir’s mass is 60 kg, his bed contains 2000 nails, and each nail point has a surface area of . Calculate the total surface area of all the nail points, then convert that area into square meters.

Calculate the pressure exerted on Fakir by the nails. Compare this to your answer from the previous question.

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