Card C00101

RBF DEFINITIONS
Acceleration: Angular & Linear: 						(1)

"There is something else that I will draw for you now that is
not in the pictures that I have shown to you and it has to do
with the phenomenon I was talking to you about: the inside-
outing of the tetrahedron. I spoke about the physicists having
two ways of classifying the movements of the Universe, what they
call acceleration.

"They have angular and linear acceleration. The angular
accelerations go around like this while they are restrained
from a common center; and the linear, when you let go of it,
let go just like that. When we let go of a rocket we just see
a point for a very few minutes. The it is outside and we put
radar on it and we can tell where it is. We can only really
do it in terms of the angular direction-- where it is going--
and watching the clock say 'I know what it's velocity is; I know
how far it is.'

"What we are doing is using a clock, which is an angular
acceleration; and we say it went one minute, and two minutes,
and so forth-- these are linear increments. What we call size
are some kind of linear increments which you could treat in"

- Cite Oregon Lecture #6, p.210, 10 Jul 62