Coefficient of Friction Lab

Procedure: Choose 1 material and 1 surface from the given list. Measure the mass of the material. Attach Newton's scale to the material and drag it along on the surface. Record the force it takes to move along the surface. Calculate the coefficient of friction using the formula F(friction) = umg.

Data & Calculation:

Error Analysis: There should be error in this lab due to small mass of materials. Small mass will lead to small friction force, which is hard to determine. Also, there might be some error in recording the force.

P.S: I actually don't like what I did. I think the way I did the lab (especially the friction force) is totally wrong. In my opinion, the force that I had from the Newton's scale is actually the applied force. To figure out what the friction force is, I must know the velocity of the object. The friction force should be F(applied) - F(friction) = ma