All Questions
13
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An object falling from very far would have varying acceleration, how can that be accounted for?
I want to have a function that describes where a falling object is.
Like this one:
h(t) = -g*t²/2
But this one is for the usual close to the surface case, where there is no variation of gravity due to ...
- 101
0
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2
answers
100
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If I throw an object upward will its acceleration change or it will stay constant at $-g$?
I mean if, for example, I throw a rock upward, its acceleration will always be $-g$ or it will be $-g+a$ because I apply a force on the object when I throw it? (without considering friction)
1
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3
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307
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Does the acceleration of Earth depend on its mass?
Let's suppose that an apple is falling down towards the Earth.
From Newton's law of universal gravitation: the force exerted on Earth by the apple is $$F = \frac{GM_1 M_2 }{r^2}$$
From Newton's ...
- 13
0
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19
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Compression of air layer by parallel planes
When object is falling and close to the ground "liquid pillow" appears under it. Object is of cylindrical form.
The differential equation that describes the motion is:
$$m\frac{dV}{dt} = mg - \frac{...
1
vote
4
answers
159
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Gravity, falling bodies, and the equivalence principle
Why is that bodies in a box accelerating uniformally in space that is sufficiently removed from gravitational fields fall identically to bodies in a box located in a homogeneous gravitational field (e....
- 85
0
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1
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146
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Simulating trajectory of object in a non-uniform but static gravitational field
This is a physics question, but the motivation for it comes from game design.
I want to simulate the motion of an object in 2D space with several point sources of gravity (actually stars). The point ...
- 103
-3
votes
1
answer
115
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What if the "actual" force to accelerate an object was hypothetically 400 x what it currently is? [closed]
Since f=ma, and we derive whatever the force it takes to accelerate a specific mass at a specific acceleration as a unit of force. I understand this ratio of actual force will always be the same in ...
0
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1
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277
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Is it possible to express acceleration in a gravitational field as a logarithmic spiral?
The derivation starts from a logarithmic spiral:
$r=de^{b\theta}$
The lenght of a part of the spiral i calculated by:
$\int_{\theta_1}^{\theta_2} \sqrt{(\frac{dr}{d\theta})^2+r^2} d\theta$
From 0 ...
- 61
1
vote
2
answers
802
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Acceleration due to gravity
Does acceleration due to gravity increase when an object at a said radius is doubled? Like for instance, if I said the radius of the earth is $5\, \mathrm{km}$ (not to scale obviously) if I doubled ...
- 13
0
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3
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28k
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Acceleration of a ball thrown into the air [duplicate]
A ball sitting in a person's hand is at rest. The ball is thrown into the air. There must be some upward acceleration which is greater than the acceleration due to gravity, since in order for the ball ...
- 103
0
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1
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631
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Sitting to Standing Posture Transition Accelerometer Triaxial Data Explanation
I don't have a physics background. (I'm a Computer Science student)
I have a waist-worn accelerometer provided by the school which is quite reliable. I've captured data of sitting still to standing ...
1
vote
4
answers
225
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Gravity and acceleration
I've imagined this little scenario to help me conceptualize things.
Let's say we have a doughnut-shaped object with a hole whose diameter is greater than that of a sphere. Let's say that the sphere ...
- 221
0
votes
2
answers
1k
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When we throw an object in the presence of gravitational attraction is the mass of the object proportional to the time of fall or not?
I was confused when i saw two object of different masses (A and B)falling from the same height(h) but both of them strikes the ground at same time. Is this possible, that masses of the objects are ...
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