# Questions tagged [newtonian-gravity]

The Newtonian model of gravity in which the force between two objects is given by GMm/r^2.

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### Is friction affected by gravity?

Some people said that moving a car on the moon would make the tires spin a bit more compared to Earth's. But then I started thinking that if static friction and gravity are perpendicular to each other,...
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### Quantumness of gravity and Padmanbhan insight on holography

Padmanabhan (and also Klinkhammer and others) argues that even classical gravity is already "quantum"...since: $$F=G\dfrac{Mm}{r^2}=\dfrac{L_p^2 c^3 Mm}{\hbar r^2}$$ Is this "naive" argument right? ...
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### Champagne bubbles and gravity

One of the influences on bubble size is the speed with which a bubble rises in a glass - this, I believe, is due to the force of gravity which acts on the liquid around the CO2. The greater the ...
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### How does gravitation work? [closed]

Why the formula is this $$F=G\frac{m_1m_2}{d^2}$$ Why masses are multiplied and devided by d square?
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### Why wouldn't the weight of an object affect the magnitude of the drag force on that object?

I ran into trouble again with a course about drag force on skiing. This is the question, and its explanation: Which of the following factors would not affect the magnitude of the drag force on an ...
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### How do astronomers explain trajectories of planets?

I'm wondering how astronomers can explain the trajectories of planets because: planets spin, so have angular kinetic energy. Thanks to the mass-energy relationship this means space-time curvature. ...
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### Why free-fall acceleration is considered constant rather than increasing? [duplicate]

The force acting on a body of mass $m$ is $mg$, where $g$ is acceleration of free fall ! But why should there be a #uniform acceleration of free-fall in the first place? As per Newton's universal law ...
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### What direction would an engine spin in space?

I am working on a science project in school with a friend on artificial gravity in space. We are both wondering if we could use normal electric motors, to let the outer ring move. Since there's no ...
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### Motion of bodies released form rest in a freely falling cabin

In a paper I was solving, there was a question stated as such: A narrow but tall cabin is falling freely near the Earth's surface. Inside the cabin, two small stones A and B are released from rest(...
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### How is the weight of the body, zero at the centre of the earth? [duplicate]

How can even the value of g at the centre of the earth be zero and what does it has to do with the weight?
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### Why, when calculating work done when a person climbs stairs, the distance is the height of the stairs but not the distance the person travels?

I was thinking, since Work Done = Force * Distance moved in the direction of the force , the distance moved in the direction of the force would be the distance of the slanted stairs instead of the ...
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### Is gravity true for every object?

Earth gravitational force pulls all the objects toward the centre of earth.But there are many instances which disobey the law of gravity. For example our blood flows from the veins situated in our ...
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### In theoretical physics, is the Graviton related to the fundamentals behind the $F = ma$ relationship?

If the Graviton transmits the gravitational force to nuclei within atoms, and an object with mass gains energy by being accelerated (change velocity / change time), does that imply that $F = ma$ is ...
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### Difference in gratitational field due to lunar apogee/perigee

I am trying to answer this Phys.SE question but got an unreasonable answer: In making laboratory measurements of $g$, how precise does one have to be to detect diurnal variations due to the moon's ...
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### The Earth's Equatorial Bulge [duplicate]

It is stated that the Earth is a 'squashed sphere' due to the very slight bulge at the equator. (Thought in reality it's such a small difference, it's essentially spherical) Typical values: ...
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### Must the minimum of the gravitational potential generated by a given charge density occur at its center of mass?

An idle wondering that falls out of some comments trying to clarify this question: Suppose that you have some isolated mass distribution $\rho(\mathbf r)$, in principle with a smooth volumetric ...
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### Does 'special relativity + newtonian gravity' predict gravitational bending of light?

It seems to me that special relativity (SR) already predicts that gravity will bend light rather than this effect being a proof of general relativity (GR). Photons have energy proportional to their ...
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### How does gravity effect to aircraft in sky?

Aside aerodynamics and buoyancy, Is there a simple way to explain how gravity is negligible in flight paths using free falling body diagram? In a parabolic trajectory,we know that at max height, ...