All Questions
21
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So I've found out heavier objects technically do fall faster? [duplicate]
Given the Earth's mass to be $M_E$, I know that $F_G = -\frac{GM_Em}{d^2}$, so the gravitation acceleration of a mass towards Earth is $g = -\frac{GM_E}{d^2}$. But what about the force exerted by the ...
1
vote
2
answers
77
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Why is it proclaimed for astronauts to be "falling"?
My physics teacher explained that the reason why it looks like astronauts are floating is because they are "falling". However, the way I think of it is that the outwards inertial force of ...
- 11
4
votes
3
answers
256
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Could you feel your weight falling through the a tube drilled through the center of the earth?
Suppose you drill a hole through the center of the earth (assume the earth is uniform and no air resistance) and you jump in. Would you be "weightless" throughout the entire fall?
The reason ...
- 396
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votes
2
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32
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Times of free-fall in different inertial reference frames in classical physics
Imagine that a ball is thrown directly down at a rate of 20 m/s from a height of 100m in Earth's gravitational field. If we were to calculate the time it takes to fall we could use the kinematic ...
-1
votes
2
answers
120
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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
0
votes
1
answer
319
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$G$-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 ...
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
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0
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60
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Free fall of two point particles in general relativity vs. Newtonian mechanics
In general relativity (GR) the equation of free fall of two point particles which start from rest at some finite distance $r_i$ is strikingly similar to the equation of free fall in Newtonian ...
0
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2
answers
271
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Weightlessness during free fall and in free space, are they same?
Einstein's thought of a person under free-fall and when suspended in free space with no forces acting, will feel the same way.
On Walter lewin's lecture on free fall he told free fall is when only ...
2
votes
2
answers
416
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Why is the moon in free fall? Isn't there a centrifugal force acting on it? [duplicate]
An object is in free fall when the force acting on it is exclusively gravitational. But why then is the moon in free fall? Isn't there a centrifugal force acting on it?
- 31
9
votes
4
answers
2k
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Difference between Free Fall and Constant Velocity
We know that astronauts in the ISS feel "weightless" because they are in a perpetual free fall. The earth's gravity is the only force acting upon them, and it is accelerating them towards ...
- 107
4
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3
answers
3k
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Why does a person float rather than staying in the elevator's floor in a free fall?
Many people have asked online why does a person float on a free falling elevator in earth. But my question is why doesn't a person just stay in the elevator's floor when the elevator is in a free fall?...
- 1,400
7
votes
2
answers
4k
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Mass hanging from spring in free fall
Q: A mass $m$ hangs from a massless spring connected to the roof of a box of mass $M$. When the box is held stationary, the mass-spring system oscillates vertically with angular frequency $\omega$. If ...
- 173
1
vote
3
answers
466
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Fictitious force on a free falling body?
So I have read the first answer to this question and I have trouble making sense of the "Newton's explanation" part.
If a person was inside a car moving on a straight road with acceleration of $9.8ms^...
- 83
0
votes
3
answers
489
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Does acceleration in free fall disprove Newtonian mechanics? [duplicate]
In Newtonian mechanics, how come the net force on an object in free fall is zero, yet it is accelerating??
If F=(a)(m), and F=0, it follows that: a must equals 0
But in reality a falling object will ...
- 83