# Questions tagged [acceleration]

The rate of change of velocity of a body per unit of time.

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### Components of velocity in projectile motion [closed]

I came across this question in my physics textbook (Gr12) and I was hoping someone could explain the solution to me A ball is thrown horizontally off a building at $8.2\,\text{m}/\text{s}$. At a ...
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I was wondering if I sit on a accelerated charge particle I will not observe radiation since particle is at rest acc to me. But my friend observe it from outside he will see radiation since it is ...
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### Is retardation reported with opposite sign as that of acceleration?

Does retardation have opposite sign of acceleration? For example if acceleration of a car is 15m/s² than if we are asked to report retardation will we report it as -15m/s² or simply there is a ...
1 vote
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### Does coordinate acceleration match proper acceleration when $v=0, s=0$?

Alice and Bob are riding in their rocket at arbitrary proper acceleration through an arbitrary region of spacetime. Bob steps out of the space ship right next to Alice, such that at $t=t'=0$, $v=0$, ...
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### Special relativity and accelerating twins

Imagine two twins synchronise their clocks and then twin A quickly accelerates to velocity v. After a time T twin B quickly accelerates to 2v and catches up with twin A. Which one will be younger? How ...
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### Covariant Directional Derivative

How is the covariant directional derivative $\frac{D}{d\lambda}=\frac{dx^{\mu}}{d\lambda}\nabla_{\mu}$ in GR related to acceleration? I am motivated to ask this question because I’ve seen it stated ...
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### Removing gravitational force of an accelerometer measurement [closed]

I'm trying to recreate a 3D path using a Gyro and Accl sensor of a GoPro in Blender. The rotation is already working but I stumbled across a small problem when I was looking at the Accl data and the ...
1 vote
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### Is there a maximum angular acceleration due to gravity for a given radius?

I'm having trouble understanding the relationship between angular acceleration and tangential acceleration, specifically, how can an angular acceleration created by the tangential acceleration of ...
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