learn something new everyday, and its making my head hurt Options

[brer]

So last night we were working on rotational motion and all i could think about was the crank in my motor and my car going around a corner..
anyone want to help explain this to me?


An object spinning at a constant speed has less acceleration at each consecutive point as you move further out from the center.
acceleration being related to the radius of the rotational orbit and the constant change in directional velocity.


Makes me car sick just thinking about it.

(IMG:http://www.914world.com/bbs2/html/emoticons/barf.gif)

[Dr. Roger]

QUOTE (bondo @ Aug 19 2005, 01:37 PM)

I'm confused by the spinning object situation... If something is spinning at x RPM, every point on it is changing direction at the same rate. The points farther from the center are moving at a faster speed, but their direction is changing at the same rate as points close to the center. It seems to me that the outside points should have GREATER acceleration if you're looking at constant RPM. This also makes sense in a real world sense as it's trickier to make large hign rpm rotational devices than small ones. Gyroscopes also put most of the mass on the outside. Hmm..

The spinning object thing is a perfect analogy.

Your ice skating and initiate a spin, with your legs and arms swinging out as far as you can stretch. Rotating at 20 RPM.

Then take those "objects" (arms and legs) farthest from the center and bring them in closer to your axis.....

Huge acceleration. 60 RPM.

Why did it do that? (IMG:http://www.914world.com/bbs2/html/emoticons/wink.gif)