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Mechanical EngineeringQ&A LibraryA block of concrete weighs 20 kg, it takes 40 N to start the block sliding on a concrete floor and 10 N to maintain sliding. Calculate the Static coefficiant of friction and calculate the kinetci coefficiant of friction My question is; what is the coefficiant of static and kinetic friction. Ive read throught the book and cant seem to find anything that explains it. I found a formula which reads F = Static coefficiant multiplied by the weight of the block. But that doesnt tell me exactly what the coeffciant of each is, Is it a constant? or does it vary based on the item being moved? Thank you.Question

Asked Mar 21, 2020

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A block of concrete weighs 20 kg, it takes 40 N to start the block sliding on a concrete floor and 10 N to maintain sliding.

Calculate the Static coefficiant of friction and calculate the kinetci coefficiant of friction

My question is; what is the coefficiant of static and kinetic friction. Ive read throught the book and cant seem to find anything that explains it. I found a formula which reads F = Static coefficiant multiplied by the weight of the block. But that doesnt tell me exactly what the coeffciant of each is, Is it a constant? or does it vary based on the item being moved? Thank you.

Step 1

Given:

The weight of block of concrete, W = 20 kg

The force required to start the block sliding, F_{s} = 40 N

The force required to maintain sliding , F_{k} = 20 N

Step 2

Solution.

The normal force, N is given by the following relation:

The coefficient of friction for static and kinetic condition is calculated as :

Step 3

For static condition:

**Answer:**

Thus, the coefficient of static friction is **0.20**

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