All Questions
5
questions
2
votes
2
answers
213
views
Why are there so many fundamental differences between contact forces and gravity?
I had this very fruitful conversation about the inertial motion of charged particles on gravitational/electric fields.
A field force like gravity, can't be felt, it does not produce proper ...
- 350
3
votes
1
answer
191
views
Is inertia still considered a mysterious force?
When I first saw, for example, weightless objects in a space capsule, I assumed that pushing them would require no effort because, of course, they did not weigh anything. On Earth, heavy objects are ...
- 2,238
0
votes
2
answers
433
views
Do the inertial mass and gravitational mass of an object depend on the frame of reference?
My understanding is that the "relativistic mass" of an object means any of the following three quantities (which are all identical):
The "mass-energy", as defined by the formula $m = E / c^2$.
The ...
- 1,967
0
votes
1
answer
255
views
A Conceptual (philosophical) doubt on equivalence principle
The reference is: Elements of Newtonian Mechanics by J.M. Knudsen; Springer; page 108 to 113.
My doubt is about the significance of the apparent distinction between Gravitation and Inertia. In ...
- 3,085
2
votes
2
answers
2k
views
Why do we feel resistance to gravity rather than the acceleration of gravity?
What's the reason it behaves differently from all other forces? What I mean is, if you're in orbit you're accelerating toward the earth at almost 9.8m/s^2, but you feel nothing. If you are riding a ...
- 360