The discussion centers on the dynamics of an Atwood machine configuration where one mass (m1) is on a surface experiencing kinetic friction (μk), while the other mass (m2) hangs off the edge. The participants clarify that although the masses move with the same speed, their velocities differ due to their directional movement. The key equations referenced include the conservation of energy principle (KEo + PEo = KEf + PEf) to analyze the system's acceleration and velocity relationships.
PREREQUISITESStudents studying physics, particularly those focusing on mechanics, as well as educators seeking to clarify concepts related to Atwood machines and frictional forces.
(mu)k is a force? Isn't μk, the coefficient of kinetic friction?Vitani11 said:2 masses m1 and m2 are attached by a string to a massless pulley. mass 1 is on the surface while mass 2 is hanging off. mass 1 experiences a friction force (mu)k.
Do you mean what is the velocity of mass 1 in terms of the velocity of mass 2?What is the acceleration of the system? What is the velocity of mass 1 in terms of mass 2?
Well, if the string remains taught then they'll certainly have the same speed. Technically their velocities would be different since they are moving in different directions (velocity is a vector while speed is a scalar).Vitani11 said:Don't these masses move at the same velocity?
Okay, that's clear now. So you now know that both masses will move with the same speed. Was that your question?Vitani11 said:I mean a system where one mass is on a horizontal surface with friction and the other is hanging off the edge connected by a string over a pulley. For some reason I was thinking atwoods machine. But yes that is what I mean