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

A ball of massmon the end of a string is released from rest when the string is held horizontal

eg:

0-----

Prove that as the ball moves through the lowest point in its swing the string has a magnitude equal to three times the weight of the ball.

2. Relevant equations

Fc = mv^2/r

Weight = mg

3. The attempt at a solution

Because its motion in a vertical circular plane, I thought that mv^2/r would be needed, obviously the equation would end up something like

xxxxxx = 3mg

But I'm not sure how or why that would happen?

Any thoughts?

**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!

# Motion Problems (tension)

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