Exam: Measuring the Coefficient of Friction

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To measure the coefficient of friction (μ), one common method involves using a force measuring device, such as a spring scale, to pull an object horizontally. This approach allows for calculating μ without needing to consider angles, as the force and mass provide the necessary data. Another method mentioned involves measuring the angle of incline (α) and using the formula μs = tan(α) to find static friction. The discussion seeks additional experimental ideas suitable for a university-level exam. Various techniques can yield accurate measurements of the coefficient of friction.
Faka
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Hi everybody.
I am going to exam on Monday. I would like to make a experiment on how to measure the coefficient of friction.

I know, that I can find the mu(s), by taking the tan to the angle α.

μs = tan(α).

Is there somebody, who has some others ideas how to measure that? Somebody, who have done the experiment before. Maybe done it in a different way. It shall be university level.
 
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I don't understand what experiment you are thinking of.
The usual way to measure μ is to use a force measuring device (spring scale?) to pull on an object. Knowing the force and the mass, you can figure out the μ. No angles involved if you pull horizontally.
 
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
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