Re: Calculating Newtons in Joules and Joules/s


Dennis B wrote:
Randy Poe wrote:
Dennis B wrote:
You are blind if you cannot see that force is energy.

Saying it over and over won't make it so.

Force can be measured in J/m.

Yes, and energy can't.

The distinctions between momentum, energy, work, and
force are that they are different measurements of one thing: Energy.

Incorrect.

For everything is energy. You cannot argue with that.

Yes I can.

- Randy

I don't have the time or energy at the present moment to respond to all
of the messages in detail. Not that I don't intend to. In the interim,
perhaps following evidence will prove to you that momentum, force,
work, and energy are all unified:

Momentum = mv
Force = (delta)mv
(Kinetic) Energy = 1/2mv^2
work = 1/2mv^2

In other words, momenum, force, kinetic energy, and work are all
measurements of mv...

Perhaps now you will begin to understand my perspective?

A couple of comments:

These formulas you have here are NOT universal definitions, despite
what you may have read. They work sometimes, under some circumstances,
for some kinds of things.

Just because m and v appear in all of them does NOT mean that they are
the same thing. For example, if momentum and energy were the same
thing, then if the momentum for an object A happened to be the same as
the momentum for object B, then you would expect the energies to be the
same, too. But they're not. Let's take an example:
Object A: m = 2 kg, v = 4 m/s
Object B: m = 4 kg, v = 2 m/s
Here momentum of A = (2 kg)(4 m/s) = 8 kg*m/s
And momentum of B = (4 kg)(2 m/s) = 8 kg*m/s. They have the same
momentum. So if momentum and energy are the same thing, then if these
two momenta for A and B are equal, then so should be the energies.
Here energy of A = 1/2(2 kg)(4 m/s)^2 = 16 J
But energy of B = 1/2(4 kg)(2 m/s)^2 = 8 J. Not the same.
So the momenta of A and B are equal, but the energies of A and B are
NOT equal.


-Dennis

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