- #1

#### DesertFox

I read a piece of text, where I found a puzzling interpretation of Newton's third law (F1=-F2).

The author gives the following representation:

**F=Rv(m1m2/l^2)**

R - reaction;

m1, m2 - masses;

v - velocity of reaction;

l - distance between the two objects.

Please, help me with explanations about the equation, suggestons about its derivation? I will be grateful for every comment.

The formula reminds me of Newton's law of universal gravitation:

**F=k(m1m2/l^2)**

F - force between the masses;

k - gravitational constant;

m1, m2 - masses;

l - distance between the centers of the masses.

But what is the reason for replacing

**k**(gravitational constant) with

**Rv**... any ideas?

It is puzzling matter, this author keeps me thrown in confusion...