(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

There are two beads at the top of a hoop that is tied by a string. The beads start moving downward on the hoop on each side. M is the hoop's mass and m represents each bead's mass.

What is that mass ratio that will cause the hoop to elevate.

2. Relevant equations

T>= (M +2m)g

3. The attempt at a solution

I tried to go about this question but I couldn't finish the equations.

I know that the momentum on the x axis isn't relevant since the beads cancel each other out.

I'm not sure how to use the hoop as a constraint. I can find the difference in potential energy but I can't seem to connect it to the force - only to the momentum.

I would really appreciate the help.

**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!

# Homework Help: Beads on a hoop that cause elevation

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