plutamech
Oct21-09, 01:09 AM
1. The problem statement, all variables and given/known data
Derive the expression for frictional resistances in block brakes.Use standard symbols to denote required parameters.
2. Relevant equations
3. The attempt at a solution
My actual problem is the fact that I have checked 2 reference books, both have derived the expression assuming the friction produces a torque in the same direction of rotation of the drum.There is no explanation why this has been done.
If these 2 forces(friction and force of rotation) were to produce torque in the same direction then I suppose the drum should never stop its rotation, so what is the actual derivation with explation?
Kindly Help..
1. The problem statement, all variables and given/known data
2. Relevant equations
3. The attempt at a solution
Derive the expression for frictional resistances in block brakes.Use standard symbols to denote required parameters.
2. Relevant equations
3. The attempt at a solution
My actual problem is the fact that I have checked 2 reference books, both have derived the expression assuming the friction produces a torque in the same direction of rotation of the drum.There is no explanation why this has been done.
If these 2 forces(friction and force of rotation) were to produce torque in the same direction then I suppose the drum should never stop its rotation, so what is the actual derivation with explation?
Kindly Help..
1. The problem statement, all variables and given/known data
2. Relevant equations
3. The attempt at a solution