amusement park ride....basically a large cylinder rotating about a vertical axis. when it is spinning fast enough the floor is dropped out and the riders stick to the wall well above the floor. find the minimum Vtangential needed. express answer in terms of R of circle, coefficent of static friction (mew)s and gravitational acell (g)..... seems easy right, and it probably is, but i dont know why my answer is not right.....btw the correct answer is(adsbygoogle = window.adsbygoogle || []).push({});

V= (gR/mews)^.5

heres what i got so far.....

x direction forces) V^2/ (r) * m - static coeff *n = 0

y direction forces) static coeff *n - mg = 0

so mg = sf *n so v^2/ R = g so

V = (g/R)^.5 where does the sfriction coeff come from?!?

i worked backwards and saw that is must have been multiplied by

v^2/R.....now why would you do that.... thanks in advanced

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Conceptual problem involving centripetal accel

**Physics Forums | Science Articles, Homework Help, Discussion**