if there is a cylindrical ride (radius r) and when it rotates the person feels pinned tot he wall and then the floor drops away. how would i start to find the equation of the angular speed needed to keep the person against the wall????

Answer 1

You need to know the coefficient of static friction, Us, between the person's clothing and the wall of the cylinder. Friction there is what keeps the person from sliding down.

Require that M*R*w^2*Us = M g

w^2 = g/(R*Us)

w is the required angular velocity in radians/s

You should have been given a Us value to assume. You could also look up some values with Google.

People wearing slippery clothing (low value of Us), like satin, will require a higher w.

Answer 2

Thanks so much :)