Question

A force of 65N is needed to start moving an 8kg box across a horizontal surface.

a.) Calculate the co-efficient of Static Friction.

b.) If the box continues to move with an acceleration of 1.4m/s2 what is the coefficient of kinetic friction?

Answer 1

Explanation:

friction is the necessary... evil

Answer 2

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Here's ur answer

We know that,

the applied external force needs to balance the opposing frictional force to make the body to start moving

Hence,

Applied force = Frictional force

Here

Normal reaction from the surface is balanced by the wieght of the body

Hence,

Normal reaction = Weight

Given in the question that,

Applied force = F = 65N

Mass of body = m = 8kg

Normal reaction = N = Weight = mg = 80N

Frictional force = μN

Hence,

Applied force = Frictional force

F = μN

65 = μmg = 80μ

μ = 65/80

μ = 0.8125

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