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F=uR watch

1. While doing questions on this, i was interested as to how this equation came about. Is there a proof?
2. (Original post by 123chem)
While doing questions on this, i was interested as to how this equation came about. Is there a proof?
question on what exactly?
(never seen it before)
3. (Original post by TeeEm)
question on what exactly?
(never seen it before)
He's wondering how the equation F=uR came about I believe.
4. (Original post by TeeEm)
question on what exactly?
(never seen it before)
F=uR, F is friction u is coefficient of friction, R is reaction force.
5. (Original post by PedanticStudent)
He's wondering how the equation F=uR came about I believe.
What do these quantities represent?
6. (Original post by 123chem)
While doing questions on this, i was interested as to how this equation came about. Is there a proof?
I suppose the coefficient of friction is found experimentally. If f is directly proportional to R then to just do the experiment a couple of times to get the constant - which is the coefficient of friction for that particular material tested.
7. (Original post by 123chem)
F=uR, F is friction u is coefficient of friction, R is reaction force.
Purely experimental evidence
8. (Original post by 123chem)
While doing questions on this, i was interested as to how this equation came about. Is there a proof?
Certain physical results are impossible to prove mathematically but are generated through observation and experiment.

Leonardo da Vinci was the first to state that if the the load of an object doubles, the friction doubles i.e. friction is proportional to normal reaction.
9. (Original post by notnek)
Certain physical results are impossible to prove mathematically but are generated through observation and experiment.Leonardo da Vinci was the first to state that if the the load of an object doubles, the friction doubles i.e. friction is proportional to normal reaction.

10. Fair enough, thanks all.

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