Register to reply

How do we argue that gravity is not a force due to curvature of space-time?

by Chaste
Tags: argue, curvature, force, gravity, spacetime
Share this thread:
Oct22-08, 07:30 AM
P: 63
1. The problem statement, all variables and given/known data
How do we argue that gravity is not a force due to curvature of space-time?

2. Relevant equations

I'm new.. I don't even understand the eqn of tensor calculus.

3. The attempt at a solution

No force is needed for as massive objects follows the curvature of spacetime with their innate velocity? Just like the earth orbits around the sun because its velocity sustains it in the path of curvature caused by the sun?

I'm writing an essay on this. and I need more points to elaborate on curvature.
Thanks for all help given.
Phys.Org News Partner Science news on
Scientists develop 'electronic nose' for rapid detection of C. diff infection
Why plants in the office make us more productive
Tesla Motors dealing as states play factory poker
Oct22-08, 12:15 PM
P: 1,636
Yea basically. The earth thinks its going in a straight line, but since the space around earth is curved by the sun, the earth follows a circular trajectory as a result. The key word "geodesic."
Oct23-08, 10:25 AM
P: 63
What gives the earth its inherent/innate velocity to maintain its trajectory/geodisic movement instead of being attracted towards the sun?
Does this velocity only apply to massive objects? what about smaller objects like humans, do we attract each other?

Oct24-08, 10:42 PM
P: n/a
How do we argue that gravity is not a force due to curvature of space-time?

well the earth is attracted towards the sun, or else it would fly out into space. It continues to move though because there is nothing to stop it (see, "newtons first law of motion").
Yes, all objects attract all other things gravitationally, even humans. Even individual atoms attract others gravitationally, but the force is extraordinarily weak and it is really only noticeable in very large objects such as planets and stars.
Oct24-08, 11:49 PM
Sci Advisor
HW Helper
P: 25,228
A telling case could be made against gravity being interpreted as curvature of spacetime if there were a dependence of gravity on the material an object is made of instead of just it's mass. So a gold satellite would orbit differently from an aluminum satellite it would make it difficult to interpret as geometry. As far as we know so far, they don't. Look up the Eotvos experiment. Work in this direction is still going on. Look up Gravity Probe B. Work those into your essay.
Oct27-08, 02:31 AM
P: 63
One point to note... My essay is to understandable to a layman and my tutor told me to focus more on the geometry/geodesic such that NO FORCE is required between masses.

I was wondering how do I explain geodesics in a laymanized manner. sigh

Register to reply

Related Discussions
Space-time curvature Special & General Relativity 16
Acceleration and Curvature of space-time Special & General Relativity 13
Space time curvature Special & General Relativity 2
The curvature cause by gravity implies absolute space? Special & General Relativity 19
Energy-> space time curvature Special & General Relativity 6