All Questions
Tagged with newtonian-gravity acceleration
276
questions
0
votes
2
answers
70
views
Do objects really "fall" at the same rate? [duplicate]
I understand that a hammer and a feather were dropped on the moon and they both landed at the same time. I understand that for all practical intents and purposes all objects do fall at the same rate.
...
- 129
1
vote
0
answers
48
views
Why does an accelerometer read geavity when at rest? [duplicate]
This may sound like a stupid question but why does an accelerometer read 9.8 (gravity) on the vertical axis when I set it down on a table?
I have just finished AP Physics Mechanics and was under the ...
6
votes
7
answers
1k
views
What changes the velocity perpendicular to radius in an elliptical orbit?
I'm working currently on a problem that asks to justify that angular momentum and kinetic energy conserves for a planet in an elliptical orbit. Although I've been taught that angular momentum should ...
- 69
1
vote
2
answers
28
views
Gravitational attraction between two bodies and gravitational accelaration [duplicate]
Since Newtons laws on gravity state that the gravitational attraction between two bodies is directly proportional to their masses and inversely proportional to the square of the distance between them, ...
- 123
1
vote
1
answer
136
views
Does General Relativity imply greater accelerations than Newtonian gravity in strong gravitational fields? [duplicate]
Does General Relativity imply greater accelerations than Newtonian gravity in strong gravitational fields, such as at 2 m/s^2?
Do the general relativistic corrections add up to more "gravity"...
- 476
0
votes
1
answer
70
views
What would be the Earth acceleration in the units where $\hbar=c=1$? [closed]
In my calculations, I have to use the units in which the Planck constant and light velocity must be taken as unity.
Now, what would be the value of Earth's gravitation force $\implies g = G\cdot\frac{...
- 101
5
votes
6
answers
608
views
Why does gravity cause objects to pull other objects with constant acceleration and not constant force? [duplicate]
I know that this may come off as an incredibly dumb question, but please hear me out for a while.
Why don't objects just tug at other bodies with a constant force? Instead, why do they apply ...
- 379
0
votes
0
answers
35
views
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 ...
2
votes
3
answers
123
views
How to understand the larger than $g$ acceleration of the free end of a falling chain?
In this article I read that the acceleration of the free end of a falling folded chain is greater than $g$, but I cannot really understand why. Why isn´t the acceleration just $g$ since it is a free ...
- 129
3
votes
5
answers
183
views
What happens physically when object is thrown up when $v$ becomes 0 at max height?
When velocity=0 during maximum height when an object is thrown up, what does that actually mean?? does that actually mean that the object doesn't change it's position over dt time period when at ...
- 31
0
votes
1
answer
62
views
When a plane is accelerating upwards, why is both the upwards acceleration and gravitational acceleration positive?
At a weight m, a plane is acceleration upwards at rate of a. We also remember the value of g.
From my understanding, we have two opposite forces that we care about.
The force due the gravitational ...
- 7
3
votes
1
answer
147
views
Why acceleration bigger when upward force is present?
Imagine object is falling down and has a mass of 1kg. There's an upward force on it of 50N. Let's calculate what the acceleration is.
$$ F_n = ma = 50 - mg = 50 - 9.8 = 40.2 $$
where ...
- 367
0
votes
2
answers
83
views
Why can't we feel Earth's acceleration? [duplicate]
The centripetal force on Earth is constantly exposing Earth to the acceleration. Why can't we feel this change of direction?
- 1
0
votes
1
answer
92
views
Change in $g$ effective due to rotation
$g$ effective at any latitude changes due to rotation of earth. Does it also change due to rotation when the body is at height or at depth or does it change only at the surface?
Edit: I am referring ...
- 69
0
votes
0
answers
34
views
How can we use Newton's laws in an accelerating frame? [duplicate]
This question is bothering me for a while. As far as I know, newton's laws are valid for any inertial or non-accelerating frame. Then how can we apply newton's law on earth where we are constantly ...
- 48
1
vote
1
answer
52
views
Is the rate with which an object gains speed when it is dropped dependent? [duplicate]
Is the rate with which an object gains speed when it is dropped dependent or independent of the object's weight?
(gravitational force)
- 13
1
vote
3
answers
30
views
Does rate of acceleration change as object gets closer or further to center of a mass?
I learnt that newton's law of universal gravitation F = G(m1m2)/R^2, and thought if the R is distance and determined gravitational strength, why do we use 9.81 as default acceleration of earth's ...
0
votes
1
answer
91
views
Free falling elevator - A person would "levitate"? [duplicate]
If an elevator goes into free fall, assuming there's no friction or anything like that, would it actually float? From what I understand, this would only happen if the elevator falls with an ...
1
vote
1
answer
186
views
Vertical movement of an object with gravitational acceleration not constant
I don't know how to start, but i will give you some context: Let's say that we have a body that we want to vertically propel at a distance of $h_f=10$ km of it's original spot considering that the ...
user353361
1
vote
1
answer
160
views
Derive Newton's Law of Gravitation from Kepler's 3rd Law, Assuming an Elliptical Orbit? [closed]
Can you derive Newton's law of gravitation from Kepler's third law, assuming an elliptical orbit?
Most of what I've seen have been people solving it with a circular orbit. However, I find it ...
- 11
2
votes
5
answers
287
views
Does horizontal acceleration affect gravity?
If we apply 1G horizontally in some object, will this constant force equal to G affect the time of falling? If the force does not affect gravity, why gravity is prioritized over this force if both are ...
- 21
1
vote
2
answers
110
views
Shouldn't gravity simulations solve for acceleration instead of force?
I'm learning computer programming right now, and one of the exercises I've seen quite a few people do is simulating gravity in space: i.e. planets orbiting a sun. All of the simulations of this kind ...
- 13
0
votes
1
answer
39
views
Body free fall calculation of the time durance as a direct derivation by time (non-relativistic)
Let's assume a body in free fall during 16 meters without resistance and I'd like to directly calculate the time of this fall.
Sure, one could painfully calculate:
$v^2 = 16 m·9.81 \frac{m}{s^2}$
$v = ...
- 282
0
votes
3
answers
159
views
How does gravitational potential relate to gravitational acceleration?
I've been wondering about what the gravitational potential V actually tells us, and how it relates to gravitational force and/or acceleration. The formula is $V = -\frac{GM}{r}$. I did some ...
- 47
0
votes
0
answers
305
views
Path reconstruction from accelerometer and gyroscope data
I found a dataset here whose columns are
attitude.roll, attitude.pitch, attitude.yaw
gravity.x, gravity.y, gravity.z
rotationRate.x, rotationRate.y, rotationRate.z
acceleration.x, acceleration.y, ...
1
vote
3
answers
778
views
Is Gravitational Force (using $F=Gm_1m_2/r^2$) only valid for point masses?
If one of the bodies between which there is a gravitational force, is not a point mass, can we use Newton's Univeral Law of Gravitation Equation $F = GMm/r^2$?
Is this equation still valid in this ...
1
vote
6
answers
2k
views
Why do people say a larger object exerts a larger gravitational pull? [closed]
By Newton's third law of motion there will be equal and opposite forces of gravity exerted on two objects despite their masses. Hence why does a larger objects exert a larger gravitational pull? In ...
- 89
0
votes
1
answer
76
views
Why the Earth's gravitational acceleration is the same for every body? [duplicate]
As i understand forces gives bodys acceleration. And mass resist this acceleration. So why does every body, regardless of their mass, gains the same acceleration when they are in earths gravitational ...
- 793
27
votes
10
answers
5k
views
What is the gravitational force acting on a massless body?
It's a well known fact that acceleration due to gravity is independent of the mass of the accelerating body, and only depends on the mass of the body it is accelerating towards and the distance from ...
- 568
7
votes
4
answers
3k
views
Why is the Moon's gravity so high compared to its mass?
According to Wikipedia, the Moon's mass is about 1.23% of Earth's, but its gravity is 0.1654g or 16.5%. If gravity is proportional to mass, why isn't the Moon's gravity 1.23% of Earth's?
EDIT:
...
- 605
0
votes
1
answer
64
views
Inertial to Gravitational Mass Ratio
According to Galileo's discovery the objects fall at the same rate due to the equality of inertial and gravitational masses. Where in our universe these two would not be equal? Following the question,...
- 11
0
votes
1
answer
86
views
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
-1
votes
1
answer
139
views
What's the answer to this differential equation of a ball rolling in a semi-circle [closed]
Salute, everyone.
Let's assume a ball with a mass $m$ starts falling from the top of a frictionless semi-circular hole in the ground whose radius is $r$.
From Newtons second law, we have:
$$P_x = ma$$
...
0
votes
1
answer
98
views
Splitting gravity along $x$, $y$, and $z$ axes
For my diploma project, I am building a posture correcting wearable, being able also to recognize some activities such as walking/running, climbing stairs, etc., and for this, I am using some ...
0
votes
0
answers
30
views
Does Diamagnetism actually lessen G forces?
Example: Astronauts are pinned to their seats by 3gs during takeoff. If there were a sufficiently strong diamagnetic field, would the g-forces felt by the astronauts be lessened, or would they simply ...
- 719
-1
votes
1
answer
281
views
If I hang from the ceiling of the elevator which is falling freely then will I experience weightlessness?
We all know that while the lift (or elevator) is accelerating downwards we feel less weight, now suppose I hang from the ceiling with the help of a stick in some cavity of the ceiling itself, then ...
- 81
0
votes
1
answer
155
views
What would happen if when falling down you get pushed up?
I know it will be a weird question, but im not a physics well informed person and I had this unsolved question for long time.
What would happen if lets say you are falling with someone else from ...
- 3
0
votes
1
answer
141
views
Maximum height reached by an object
Here, in the last line, from the formula s is negative, but how can s be negative?
Also, should it not be s=u^2/2g instead of
s= - u^2/2g?
- 13
1
vote
1
answer
229
views
Change in Path of a satellite on changing its velocity
When the speed of a Satellite travelling in a perfectly circular orbit is increased does the path of the satellite remain circular and the radius is increased OR does the path of the satellite follow ...
-1
votes
1
answer
135
views
Would a chess board fall faster than the chess pieces?
So if they were both falling in air, would the chess board fall faster since it's heavier?
2
votes
5
answers
4k
views
Why does the normal force go down in an downward accelerating elevator?
When standing in a stationary elevator the force due to gravity and the normal force cancel each other out hence the net force is 0. When the elevator starts accelerating downwards there's a net force ...
- 183
0
votes
0
answers
58
views
Separate the rotational acceleration from the gravity
I tried to plot the magnetometer and accelerometer readings: Fig1 and Fig2, respectively. The readings were collected by rotating the sensors around x,y,z axes. As you can see, the mag readings (Fig1) ...
2
votes
1
answer
94
views
What is the gravitational field in the middle of a thin rod?
I just calculated the gravitational field on the $x$-axis created by a thin rod of mass $M$ and length $L$ by applying the formula:
I got this:
However there are some issues that I don't get. If I ...
0
votes
3
answers
154
views
Forces to move a mass up and down and relation to potential energy [closed]
Basically the question is: Does it take the same forces to move a mass up or down including acceleration and deceleration?
The Newton second law: $F=m*a$ tend to say yes. In reality this is far from ...
- 103
0
votes
0
answers
46
views
Why acceleration due to gravity same for two objects of different masses (neglecting air resistance)? [duplicate]
If a feather ball and bowling ball are thrown , both reach the ground at the same time. (neglecting air resistance)
The reason given to this is that
Both the bodies have same acceleration .
My ...
- 17
0
votes
1
answer
112
views
What is the intuition behind excluding the effect of gravity from accelerometer data
In the unit of accelerometer and linear acceleration, I see that accelerometer is angular and the linear acceleration is linear. There is the impact of gravity on the accelerometer. However, ...
- 109
-1
votes
1
answer
90
views
What would reach the ground first? [closed]
Hi I’m trying to get my head round this if a bowling ball and coin from the Empire State at exactly the same time what would hit the ground first I know that gravity = 9.81ms-2 but what else am I ...
- 19
4
votes
3
answers
378
views
What are the magnitudes of the acceleration of the falling balls B and C relative to A? (Need help with binomial approximation)
I'm mostly having a problem incorporating the approximation. My trouble is towards the bottom of the post, but I wrote down all of my steps just in case I made an error somewhere.
So in this question ...
- 158
0
votes
1
answer
63
views
Will a rocket need the same fuel and energy going 1 g upwards on Earth as a rocket 1 g in space?
Will the gravity of Earth change the result (making the rocket on earth need more fuel and energy than the one in space)? Or it is the same?
user293241
0
votes
1
answer
47
views
What is $g$ for a bob hanging from a string?
Imagine a bob hanging from a string. Now, let's say that you pull the string to the right (or left, doesn't matter), and then allow it to fall freely. Will the gravitational acceleration g be the same ...
- 801