# thesquid24

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# 38 Actions

 May17 accepted Boundary conditions on wave equation May16 asked Boundary conditions on wave equation May11 accepted SHM of floating objects May11 awarded Commentator May11 revised SHM of floating objects added 9 characters in body May11 comment SHM of floating objects @Inceptio I was kind of considering $k$ to include the $m$ but I'll update the question for clarity. May11 asked SHM of floating objects Apr27 accepted Harmonic oscillator with light damping Apr27 awarded Custodian Apr27 reviewed Approve suggested edit on Harmonic oscillator with light damping Apr27 asked Harmonic oscillator with light damping Apr7 accepted Solving systems of equations in dynamics Apr6 accepted calculating work done by friction Apr6 asked calculating work done by friction Apr6 awarded Supporter Apr1 accepted Rolling ball which slips Mar27 comment Rolling ball which slips at which point the friction is entirely static. Are you saying that after the kinetic friction disappears, there IS static friction? After talking with jkej, I came to agree that after the ball starts to roll there are no frictional forces acting on it. I now understand static friction to be a reactive force, and there is nothing "fighting against" the ball's motion for static friction to react to. Mar27 comment Rolling ball which slips Mar27 comment Rolling ball which slips Both the book and my instructor have gone to great extent to emphasize: Static friction must be present to make round objects roll. mit.edu/~8.01/gen98/zachar.html Mar27 comment Rolling ball which slips I'm sorry I'm a bit skeptical. $v_{CM} = R \omega$ iff the ball rolls without slipping. Why would $\alpha = a_{CM}/R$ hold all the time? I thought that it only followed from differentiating the first condition w.r.t. to time. Furthermore, after the slipping stops, $F_{fr}$ is still present I believe. It's just that it is static friction, no longer kinetic friction.