Simple coefficient of friction question

In summary, the given information includes the torque on the motor with and without a load, the surface area in contact with the motor shaft, the mass of the loaded material, and the rotational speed. The conversation discusses finding the coefficient of friction and the formula for calculating rotational force. Based on the given numbers, the coefficient of friction is estimated to be 0.0428, which seems reasonable for plastic and polished steel in hot water.
  • #1
jmart157
20
0
Here's my givens... i need to find the coefficient of friction on the material.

No load torque on motor - 3.19 Nm
Loaded torque on motor - 3.49 Nm
Surface area in contact with motor shaft - .1885"
Mass of loaded material on shaft - 17.16 lbs = 76.33 N
Rads/sec - 31.42Looking to find the coefficient of friction. I need formulas and assistance please, not answers :)

Also, if I need to get/provide more information, I believe I can.

Jon
 
Last edited:
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  • #2
alright, this came too easy. please confirm...

torque = Radius x force

which means rotational force = torque/radius

loaded rotational force = 41.83/2" = 20.92 lbsf
no load rotational force = 38.25/2" = 19.123 lbsf

resistive force from load = 20.92 lbsf - 19.123 lbs f = 1.7928 lbs

coefficient friction is (resistive force divided by rotational force) divided by 2

CoF = (1.7928/20.92)/2 = 0.0428

This seems realistic as this is plastic wearing against polished steel, in hot water. What do you guys think?
 

FAQ: Simple coefficient of friction question

What is the simple coefficient of friction?

The simple coefficient of friction is a measure of the amount of resistance between two surfaces in contact with each other. It is represented by the symbol "µ" and is defined as the ratio of the force of friction between two surfaces to the force pressing the surfaces together.

How is the simple coefficient of friction calculated?

The simple coefficient of friction is calculated by dividing the force of friction by the normal force. This can be done by measuring the weight of an object on a surface and the amount of force needed to move it, and then dividing the force needed by the weight.

What factors can affect the simple coefficient of friction?

The simple coefficient of friction can be affected by several factors, including the type of surfaces in contact, the smoothness or roughness of the surfaces, the presence of lubricants, and the temperature of the surfaces.

Why is the simple coefficient of friction important?

The simple coefficient of friction is important because it helps us understand the amount of resistance between two surfaces and can help determine the force needed to move an object. It also plays a crucial role in engineering and design, as it helps determine the best materials to use for different applications.

How can the simple coefficient of friction be reduced?

The simple coefficient of friction can be reduced by using lubricants between two surfaces, choosing smoother materials, or by changing the angle or surface area of contact between the two surfaces. Additionally, surface treatments such as polishing or coating can also lower the coefficient of friction.

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