[SOC] Scientific "Truth in Advertising" Warnings

[JMcAulay]

At 09:24 AM 03/23/2002 +1100, Ian C. Purdie wrote:
>W2AGN wrote:
>
>> On Friday 22 March 2002 16:37, Ian C. Purdie wrote:
>> > f5pbl@qsl.net wrote:
>> > > HEALTH WARNING: Care should be taken when lifting this product,
since its
>> > > mass, and thus its weight, is dependent on its velocity relative to the
>> > > user.
>> >
>> > TRIVIA:
>> > How many know the difference between "mass" and "weight"?
>> >
>> >
>> --
>>
>> Weight is the force of gravity acting upon an object, Mass is the
quantity of
>> matter.
>
>Give the man a cupee doll. Weight = Mass X Gravity.

Almost.  Indeed, Weight = Mass times Gravity, but gravity is not a force.
Weight is a force.  Though we casually speak of "The force of gravity,"
gravity is actually an acceleration.  The weight of an object is a force
caused by the acceleration of gravity acting on the mass of the object.
Isaac Newton seems to have been the first human to develop a concept of
mass and mention it to anyone else who cared.  Newton's second law, easily
put into equation form, defines it:  F=MA, Force = Mass times Acceleration.
 Or, in the special case of weight, Weight = Mass times Gravity.

73
John  SOC 263