[time-nuts] OT: Not pendulums or atomic clocks or gravity
jack at hudler.org
Wed May 30 17:45:10 EDT 2007
Friction plays a large role in impact to launch angle.
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of buehl
Sent: Wednesday, May 30, 2007 9:20 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] OT: Not pendulums or atomic clocks or gravity
Try this low tech analysis on for size.
Inertia at work: The ball is elastic and compresses sufficiently that all
the kenetic energy is changed into potential energy; Center of mass having
moved only slightly due to inertia. At this time the compression is
concentrated between the center of mass and the face of the club, along a
line normal to the surface. This potential energy is then converted back
into motion (kenetic energy) and the direction of this motion is normal to
the club surface.
Very different than a light beam or wavefront reflecting off of a surface.
At 08:43 PM 5/29/2007 -0700, you wrote:
>The angle of incidence is relative to the surface normal, not the surface
>itself. It's 0 degrees as the club face contacts the ball, not 45.
>-- john, KE5FX
> > -----Original Message-----
> > From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
> > Behalf Of Palfreyman, Jim L
> > Sent: Tuesday, May 29, 2007 8:36 PM
> > To: time-nuts at febo.com
> > Subject: [time-nuts] OT: Not pendulums or atomic clocks or gravity
> > Since you have all enjoyed this discussion on rotating non-inertial
> > frames of reference so much, here's another one for you.
> > In golf, a typical pitching wedge has an angle of 45 degrees. Since
> > angle of incidence equals angle of reflection why doesn't the ball
> > bounce off the club, go straight up and hit you in the face? (A good
> > golfer would hit it 100m.)
> > Jim Palfreyman
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