# Questions tagged [reference-frames]

A reference frame is a particular coordinate system chosen to represent physical entities. The notion is most often used in special and general relativity to denote particular coordinates chosen on the spacetime manifold.

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### Confusion regarding centrifugal force

In this https://youtu.be/YCrFwQtW5o0 sir took a disk and demonstrated that the particles kept on it fly away due to centrifugal force. Now, suppose I take a ring in free space and a placed particle in ...
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### Work=Force Displacement Displacement relative to what?

Ok, taking the equation W=FD. Say a 30N force is acting on a 10kg object over 10s, causing it to move 150 metres over a frictionless surface. The work done by this force will be 30(150)J. However, if ...
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### Equation motion of a material point on parabola through $\vec{F}=m\,\vec{a}$ [closed]

Consider a material point of mass $m$ that moves on a parabolic bowl $y=k\,x^2$, with $k>0$. In the reference frame of point: I have the following motion equations: \begin{align} \begin{cases} N-...
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### Inertial and non-inertial frames

Firstly, I want to say that I realise that there are a lot of questions on inertial and non-inertial frames of reference, but the question I had in mind, no one seemed to have asked. I've just started ...
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### Do I have the correct idea of time dilation?

Suppose that I send my twin away from the earth at 87% the speed of light. From the time dilation equation, since the twin is moving, the time interval between any 2 events, as measured by me, would ...
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### Magnetic force between 2 moving charges

If 2 positive charges are moving in the same direction with a velocity v relative to the ground frame, will they experience a magnetic force? I’ve read several times that the velocity in the Lorentz ...
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### Do pseudoforces arise due to inertia?

Wikipedia says The fictitious force is due to an object's inertia when the reference frame does not move inertially, and thus begins to accelerate relative to the free object. The fictitious force ...
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### Is inertia still considered a mysterious force?

When I first saw, for example, weightless objects in a space capsule, I assumed that pushing them would require no effort because, of course, they did not weigh anything. On Earth, heavy objects are ...
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### Foucault pendulum equations of motion

All the sources I see for the equations of motion for the Foucault pendulum start with the small angle approximation. Does anyone know a source or textbook that does the full derivation? ...
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### Why is the frame attached on the Earth non-inertial in General Relativity? ( neglecting rotations etc..)

The EEP says that freely falling frames are inertial. But suppose the freely falling frame is at some spacetime point. At that point you can by a suitable coordinate transformation reduce the metric ...