Why does mass have the force of gravity?

  • Thread starter dhayward
  • Start date
  • #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


The Attempt at a Solution

 

Answers and Replies

  • #2
cristo
Staff Emeritus
Science Advisor
8,122
74
What's the actual question here?
 
  • #3
2
0
how is the gravitational constant derived?
 
  • #4
961
0
empirically i think. In other words it is inferred from experiments/observational data and not the result of any derivation.

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
10,025
135
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.
 

Related Threads on Why does mass have the force of gravity?

Replies
8
Views
22K
Replies
2
Views
2K
Replies
5
Views
4K
Replies
1
Views
3K
  • Last Post
Replies
8
Views
713
  • Last Post
Replies
3
Views
2K
Replies
2
Views
2K
Replies
2
Views
840
Replies
2
Views
1K
Replies
5
Views
41K
Top