- #1

- 2

- 0

## Homework Statement

Where does mass get the force of gravity?

## Homework Equations

F = G(m1 x m2)/r^2

F = force (N)

G = Gravitational constant (Nm^2/kg^2)

m = mass

r = distance between m1 and m2

You are using an out of date browser. It may not display this or other websites correctly.

You should upgrade or use an alternative browser.

You should upgrade or use an alternative browser.

- Thread starter dhayward
- Start date

- #1

- 2

- 0

Where does mass get the force of gravity?

F = G(m1 x m2)/r^2

F = force (N)

G = Gravitational constant (Nm^2/kg^2)

m = mass

r = distance between m1 and m2

- #2

cristo

Staff Emeritus

Science Advisor

- 8,107

- 73

What's the actual question here?

- #3

- 2

- 0

how is the gravitational constant derived?

- #4

- 960

- 0

The holy grail in physics (and I have a completely incomplete understanding--physics is a hobby for me) is to capture all 4 fundamental forces including gravity in a superset of equations with a bare minimum of constants.

- #5

- 529

- 1

Are you asking why the inertial mass is equal to the gravitational mass?

- #6

arildno

Science Advisor

Homework Helper

Gold Member

Dearly Missed

- 9,970

- 134

how is the gravitational constant derived?

The first who carried out experiments that led to an empirical determination of G was Cavendish. By means of torsion springs, I think.

Your question can, however, be formulated in a "deep" way:

Why should an object's inherent resistance to motion change (i.e, its inertia) be in any way related to the strength of the attractive force existing between objects (i.e, gravitation)?

This identity between inertial mass and gravitational "mass" is not at all a trivially understandable relationship.

Share: