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The graph shows the friction on a block against the push applied to it…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
The graph shows the friction on a block against the push applied to it. The block has a mass of and rests on a level floor. Taking , find the coefficients of static and kinetic friction.
Need a reminder? The key ideaShow
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Given. From the graph: the largest static friction is ; the kinetic friction is . .
Plan. Divide each friction by the normal reaction.
Step 1. Static. .
Step 2. Kinetic. .
Answer: and .
Check. , as it must be.
Watch out. The straight part of the graph, at , is not a coefficient. There, static friction just equals the push.
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