Camera Security

On 2013-07-16 21:44:28 -0700, "J. Clarke" said:

In article ,
says...

On 2013.07.06 11:05 , J. Clarke wrote:
In article ,
says...

On 2013.07.03 22:28 , J. Clarke wrote:
In article ,
says...

On 2013.07.03 20:38 , J. Clarke wrote:

The trouble with the metal straps is that things like scooter grabs can
be turned from loss of property into serious injury. With luck it will
be injury of the grabber who gets pulled off the scooter and into the
path of an oncoming lorry. Personally my luck runs more in the
direction of me being pulled into the path of the lorry.

The person on the scooter is in a much more unstable position than a
person walking or standing. OTOH the crafty buggers probably feel the
resistance and abandon within a shake of a lamb's tail.

The scooter's 2 up and gyrostabilized--you've got anywhere from 400-1000
pounds of mass going for you depending on the value of "scooter".

In Asia the people doing the grabbing generally mass about 50 - 60 Kg.

That's the passenger. The "driver" is another 50-60kg.

The scooter can keep on going but he's not going with it. And as I
said, as soon as the strap doesn't cut and there is resistance he's just
going to let that one go.

Who said anything about "cut"?

Oh, so you know nothing about how these guys work. I've seen it done
and it's slow down, bump, cut, grab and run (or ride).

If you have a steel cable strap it's:
slow down, bump, cut - Ooops - run (or ride).

(A pound is not "mass").

Now you are being pedantic, and ignorant as well. A pound mass is
approximately 1/32 of a slug.

You lost when you mixed pounds and mass. A slug is mass. A pound is
force. There is no mixing them.

That would be news to the faculty and staff in the Aeronautical
Engineering department at The Ohio State University, in the Mechanical
Engineering department at The Georgia Institute of Technology, the
engineering staff at United Technologies, the national standards bodies
of the United States, Canada, New Zealand, the United Kingdom, South
Africa, and Australia, which have established an international standard
defining the avoirdupois pound as 0.45359237 kilogram, and a variety of
other degreed engineers and scientists of my acquaintance.

Sorry, but you are not only being pedantic, but now you are being
stupidly pedantic.


OK! Let's get pedantic.
What the man in the street thinks of as "weight" and mass are two
different things. "Weight" expressed in "pounds" is not the same as
mass expressed in "pounds".

The force known as "weight" (Lb., Kg, etc.) is a force proportional to
mass and acceleration. So other than dealing with mass v "weight" in
different gravitational acceleration fields (Earth v. Moon) you have to
go to Newton and the 2nd Law of Motion and the concept of inertial
acceler. So "weight"= (mass)(acceleration), or W=mg

So given the difference of gravitational acceleration on Earth and the
Moon, a man with a 100Kg mass will show two different weights if his
mass is measured with a spring scale on the Moon, to that on Earth.
However, if a balance beam mass scale is used his mass will be equal
(100Kg) on both Earth and Moon.

In the case of the "scooter snatch" there is inertial mass to be
overcome (the mass of the bag carrier). there will be several possible
results in a "scooter snatch" attempt where the strap is not cut.
1: the bag is separated from the carrier.
2: the bag and the carrier are unable to overcome the force imposed by
the acceleration of the scooter and are dragged.
3. the snatcher on the scooter is unable to overcome the inertial force
of the mass of the bag carrier, and is pulled from the accelerating
scooter.

Both the carrier and the snatcher are subject to the inertial force
applied by the acceleration of the scooter, and physics will determine
which will prevail once surprise is taken out of the equation.


For most folks "weight" is the force on an object required to overcome
gravity. So strangely enough a mass in free fall is weightless until
its inertia cannot overcome gravity. i.e. the instant it touches the
surface of the body exerting gravitational attraction. That is why an
individual with a 100Kg mass can experience weightlessness while flying
in NASA's "vomit comet". effectively he/she is in free fall while
retaining a weightless mass.

A slug is an Imperial unit of mass, not weight.

--
Regards,

Savageduck