engineering fundamentals Discussion Forum
Directory | Career | News | Standards | Industrial | SpecSearch®
Home Membership Magazines Forum Search Member Calculators

Materials

Design

Processes

Units

Formulas

Math
List Recent Topics | Start a New Topic
 

<< Previous Message No. 13731 Next >>
Author: rubinho
Time: 04/23/04 10:12 PST
This is a reply to message no. 13707 by rubinho
Reply | Original Message | New Topic | List Topics | List Messages on This Topic
Current Topic:
Calculating trajectory of ball rolling down slope and off launch ramp
Good news: I did all the calculations and they come up with sensible numbers.  

Bad news:  I needn't have done so as the machine will never work.  Newton's laws dictate that all the balls will end up in exactly the same place.  Think about it, they are all identical except mass and the only external force is that of gravity; everything boils down to a ratio of F=ma.  They all leave the lauch ramp at the same velocity and they all hit the ground at the same place.  

It's a shame I wasted your time and mine working out the calculations for, what is in fact, an obvious answer!  

Thanks all the same for your help, I did learn a couple of lessons:

- Relationship between energy and motion
- Relationship between angular and linear velocity
- Don't ignore basic principles

Damn that Gallileo! :)
[ List Replies to This Message Only ]

Home  Membership  About Us  Privacy  Disclaimer  Contact  Advertise

Copyright © 2017 eFunda, Inc.