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

Hey guys.

Look at this problem.

This is the question in short, they release a ball with mass m and radius r from 2R high into a loop. the balls movement is without sliding.

The first part of the question is to find the angle (alpha) in which the ball disconnects from the surface, I did that.

The second part, is to find H which is the maximum high that the ball will reach to (as you can see in the sketch).

In there solution, they used energy conservation (the equation I marked in red). My problem with that equation is, that when the ball reaches max high, it still has velocity on the x axis and they just ignored it.

So, my question is, is that equation right? am I missing something?

thanks.

2. Relevant equations

3. The attempt at a solution

**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: Ball Energy question

Can you offer guidance or do you also need help?

Draft saved
Draft deleted

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