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.

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.

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Expert Answer

Step 1

Given:

The weight of block of concrete, W = 20 kg

The force required to start the block sliding, Fs = 40 N

The force required to maintain sliding , Fk = 20 N

 

Step 2

Solution.

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

Mechanical Engineering homework question answer, step 2, image 1

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

Mechanical Engineering homework question answer, step 2, image 2

Step 3

For static condition:

Mechanical Engineering homework question answer, step 3, image 1

Answer:

Thus, the coefficient of static friction is 0.20

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