Questions tagged [friction]

The resistance a surface or object encounters when moving over another.

209 questions with no upvoted or accepted answers
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Why does no slipping occur when a particle is attached to a string, which is wound onto a circular disk, and the system is allowed to move?

In this question, the only way we can find the angular acceleration of the disc is by equating it to the linear acceleration of the particle divided by the radius. But this holds only if the string ...
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1answer
1k views

Is coefficient of friction is always less than unity?

Is the coefficient of friction always less than unity? What are the cases in which coefficient of friction is greater than unity?
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1answer
627 views

Is it possible that water flow stops in a very long pipe due to friction forces?

I've been thinking about a hypothetical problem concerning fluid flow across two distant countries. Assume that country A wants to share water from a river with country B. Country A builds a dam to ...
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1answer
780 views

Massive pulley, torque and tension

Given a pulley and two masses, like so: Take the pulley to have a non negligible mass, zero friction between pulley and axle, but enough friction between pulley and rope such that the rope doesn't ...
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2answers
85 views

Intuitive Understanding of Mass, Acceleration, Friction Force and Coefficient of Friction?

When calculating maximum acceleration, I know that mass cancels out to get: $$\mu_s = a/g$$ Is there an intuitive approach to this? Here's a problem that involves this: If half of the weight of a ...
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1answer
114 views

Kindling to make a fire

I know that rubbing stuff like dry grass or wood on firewood works to make a fire but why does it work? I think it is because the friction produces heat but then how come our hands don't get on fire ...
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1answer
68 views

treadmill physics, wheel size vs. counterforce

I'm trying to design a classical treadmill for rodents which has two wheels at the two end and a plain "conveyor" belt in between. What is the best way of designing this if i want to have minimal ...
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2answers
50 views

How can friction be a canditate for centripetal force?

What if a car goes around a circular track of really large radius say 2018 km? Would friction act towards the centre, i.e perpendicular to direction of velocity?
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1answer
92 views

what is the friction (static or kinetic) between two blocks in contact

please will someone can explain this to me: given the coefficient of statics of kinetic friction, when two blocks are in contact and do not slip on each other, which friction do we use? static or ...