All Questions
Tagged with newtonian-gravity reference-frames
228
questions
-1
votes
1
answer
60
views
Elevator situations
What happens to my weight when I'm in an elevator that's,
a. stationary
b. moving with a constant velocity
c. moving upwards with an acceleration a where a<g
d. moving upwards with an acceleration ...
- 801
-1
votes
2
answers
120
views
Who moves when an object falls by gravity? [duplicate]
I'm reading calculus book by Morris Kline. This book treats physics because calculus grew out of physical and geometrical problems. I have no background about physics and got a question while reading ...
- 111
2
votes
2
answers
81
views
Gravity, forces, spacetime, acceleration conundrum
If gravity is not a force but rather spacetime curvature, why when standing on a scale do we say the "normal force" the actual force that the scale is measuring? Is the normal force caused ...
user232620
17
votes
7
answers
5k
views
If centrifugal forces are fictitious, then isn't gravitational force also fictitious?
When the earth revolves around the sun, the sun attracts the earth by a gravitational force $F_{se}$ (centripetal force), and the earth attracts the sun by a gravitational force $F_{es}$ (centrifugal ...
- 1,018
9
votes
11
answers
5k
views
Can a person on the equator jump up higher into the air at sunset than at sunrise?
I am wondering if a person on the equator can jump up slightly higher into the air at sunset in comparison to jumping up into the air at sunrise.
The reason for this would be that at sunset the Earth ...
- 478
0
votes
1
answer
319
views
$G$-Force on falling object?
I'm trying to understand how G-Force is calculated, specifically with drop tests but also generally.
If an object is sitting on a table it has a G-Force of 1. i.e. it has 9.81m/s^2 of acceleration ...
-1
votes
1
answer
63
views
In this world of pseudo forces what is real?
I was learning concept of pseudo force and encountered a problem which I found pretty interesting,
I am told that the surface in contact of wedge and box having mass $m$ is frictionless and I am ...
- 11
4
votes
1
answer
80
views
Weightlessness and free fall on oil drop experiment
Suppose I have an oil drop which is negatively charged placed in a box with the bottom of the box negatively charged. When this box and oil drop is placed on a table where the box is stationary, the ...
- 67
1
vote
3
answers
1k
views
Which force provides the centripetal acceleration that makes objects on earth's surface rotate about Earth's axis of rotation?
Let's say an object is at rest in Earth's reference frame. We know that Earth's reference frame is non inertial. If we were to observe that object from an inertial frame, we would see three forces ...
- 866
3
votes
1
answer
95
views
Can a pendulum at resting equilibrium position still demonstrate the Earth's rotation?
I conducted an experiment in my youth, creating a 'sand pendulum' hanging from the bedroom ceiling to a bowl of flour. I did not set the pendulum into motion, but rather wanted to see if the force of ...
- 31
1
vote
1
answer
93
views
Taylor expansion of the acceleration between Sun and Moon [closed]
We consider the tree body system (Sun, Earth, Moon) in the reference frame centered in the Earth rotating with angular velocity $\Omega$ around the Sun.
Let $\vec{y}=(y_1,y_2,y_3)$ be the time ...
- 180
0
votes
2
answers
451
views
Gravitational potential in a system of two particles
Suppose two particles with masses $m_1$ and $m_2$ are interacting via a central force. Lets work in the center-of-mass frame, and let $r$ be the distance from the masses to the center of mass which ...
- 273
2
votes
1
answer
100
views
When some mass does vertical upward motion, which direction is the direction of the inertial force?
When I throw a ball upward on the earth, at a later time, that ball would be in the condition of $v=0$ (at the highest position) and then finally it would fall. If a ball falls, its direction of ...
- 19
1
vote
2
answers
62
views
Why only one pseudo force for a revolving frame?
Pg 348, Kleppner and Kolenkow.
Earth in a free fall towards sun is shown.
Authors write
The earth accelerates toward the sun at rate $\mathrm{A}=\mathrm{G}_{0}$
...
The apparent force to an ...
- 1,270
0
votes
0
answers
54
views
A thought experiment to prove that Newtonian gravity is incomplete [duplicate]
A particle is at rest in one frame having mass $m$. It'll attract another mass proportional to its mass ( newtons law) .
We jump into another frame moving close to speed of light. In this frame it's ...
- 1,270