Re: Swing and momentum
- From: Henning Makholm <henning@xxxxxxxxxxx>
- Date: Mon, 05 Jun 2006 16:07:43 +0200
Scripsit "Edward Green" <spamspamspam3@xxxxxxxxxxx>
Related playground question: how can a child standing in the middle of
a turntable, not touching anything else, make it rotate?
Friction in the bearing allows it to transmit a small torque to the
turntable. The child starts turning her torso with a torque that it
small enough to be countered by the turntable, then suddenly reverses
her rotation with a large torque in the opposite direction. The large
torque overcomes the friction and the turntable begins to rotate.
I don't think that the trick will work a second time once the
turntable does rotate. It depends on non-linearity of the friction.
--
Henning Makholm "Gå ud i solen eller regnen, smil, køb en ny trøje,
slå en sludder af med købmanden, puds dine støvler. Lev!"
.
- Follow-Ups:
- Re: Swing and momentum
- From: Edward Green
- Re: Swing and momentum
- From: briggs
- Re: Swing and momentum
- References:
- Swing and momentum
- From: BernardZ
- Re: Swing and momentum
- From: Martin Hogbin
- Re: Swing and momentum
- From: Edward Green
- Swing and momentum
- Prev by Date: Re: Lazy Invariance Question
- Next by Date: Re: My Favorite Laser
- Previous by thread: Re: Swing and momentum
- Next by thread: Re: Swing and momentum
- Index(es):
Relevant Pages
|
