A) In friction problems, the text uses R in place of the frictional force and normal force. Derive...

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A) In friction problems, the text uses R in place of the frictional force and normal force. Derive R. and why is Micro= tan (Q). Q is not theta, not Beta, not gamma. I don't know how to explain, I think it is called Si.
B) what is the difference between Truss and a Frame ? and what is the difference between frame and machine ?

David · Accepted Answer

A) In friction problems, the text uses R in place of the frictional force and normal force. Derive R. and why is Micro= tan 
(Q). Q is not theta, not Beta, not gamma. I don't know how to explain, I think it is called Si. 
Answer 
Frictional forces depend upon Reaction offered by the surfaces or force of action. In general Formula for calculating 
frictional force depends both on the nature of surface and Reaction on the surface. 
Frictional force = μR where μ is coefficient of friction and R is the Reaction. Reaction on the surface is always normal to 
the force so in some text R is represented by Normal Force N or some books use R as a friction because it is the main 
component of Frictional force.
Note: Reaction is always perpendicular to the surface.
In the above figure Reaction is represented by N as reaction is also a Normal Force.

A) In friction problems, the text uses R in place of the frictional force and normal force. Derive R. and why is Micro= tan (Q). Q is not theta, not Beta, not gamma. I don't know how to explain, I...

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