# Questions tagged [acceleration]

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

345 questions with no upvoted or accepted answers
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### Confusion over what constitutes a uniform gravitational field in relativity

Suppose we have some observer moving upwards with a constant proper acceleration, by the equivalence principle this is the same as the observer remaining stationary in a gravitational field, like ...
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### Is centripetal acceleration independent of linear acceleration in accelerated circular motion?

Can we say that there is a relationship between them, or are they independent of each other? why? Like does $a_c=v^2/r$ imply $a_c$ and $a_{tangential}$ are related? I am very confused by this ...
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### How to draw a velocity curve from Engine power, weight and traction?

Not sure if this is the right forum but I would like to plot a velocity curve of a train, starting at 0km/h and accelerating up to a max speed. The data I have for the locomotive engines are: ...
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### How to measure gravitational acceleration in airplane?

I want to see (actually: show to my kids) evidence of the $1/r^2$-decay of gravitational acceleration by measurement, in a way as simple as possible. So I was thinking of measuring gravitational ...
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### How can I calculate a brachistochrone-like transfer burn with a changing acceleration?

I'm working on a sci-fi story with a few locations set across the solar system, and I want to make sure that it works as accurately as possible. In order to hop from planet to planet, the ships use ...
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### Can I calculate the downhill force with the data of a smartphone sensor?

Apologizes for the long explanation, I couldn't find a shorter one. I'm working on a project and want to calculate the downhill force only with data I can get with the sensors of a smartphone. I ...
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### Acceleration event horizon

Many introductions to General Relativity talk about the equivalence of gravity and acceleration. Can the interesting properties of a black hole — event horizons, Hawking radiation, etc. — be produced ...
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### How to calculate acceleration vector of a moving object to intercept a stationary object

The short version: I'm moving on a certain straight-line trajectory (two dimensions only, thank goodness), and I want to intercept a stationary object, with constraints on maximum acceleration and ...
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### Odd experiment results (electromagnetics)

Okay, a bit of background. So I'm working on a linear accelerator (you might know it as a Gauss rifle), and I had worked through the equations I thought I needed (Magnetic force, displacement, etc.) ...
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### Are there bounds or measurements on the derivative of acceleration (jerk)

The title says it all. Is there a physical maximum value to the 3rd derivative of position? Common Lore says that there is not and that jerk does not play any role in physics. My guess is that there ...
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### How to model an accelerometer measurements on a car wheel?

I am working on kinematically modelling an accelerometer on a car wheel. When working on the initial conditions, I am confused whether or not I should use the gravitational acceleration since there ...
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### Universe expansion from initial explosion

If the universe is expanding at an accelerated rate, is it because it hasn't reached its maximum velocity from initially exploding? I'm thinking in terms of a bullet being fired from a weapon. It ...
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### Internal stresses of accelerating body

Refer to pics above. I have an accelerating body that has a fin extruded from the side. I want to analyze the stresses at the base of the fin that result from high accelerations. So, the body is ...
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### Relativity: acceleration and time reversal

Suppose there is an object motionless behind me. Now suppose I (almost) instantly accelerate away from it. In my perspective, this causes the time of the object behind me to be set back. Now this ...
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### Electrons and Magnetism

Electron at rest generates Electric field. Electron moving without acceleration produces electric and magnetic field. Electron moving with acceleration produces electromagnetic waves. Please explain ...
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### Is it possible to know if you're moving or standing still due to the definition of Einsteins equivalence principle?

I have a question regarding Einstein's theory of relativity. Einstein's equivalence principle states that locally it's not possible to tell if you're accelerating or being stationary in a ...
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### Tangential acceleration and the transverse acceleration?

i'm studying Classical mechanics from Analytical mechanics textbook , and i'm encounter with transverse acceleration in Chapter five The term $\omega \times r'$ is called the transverse acceleration, ...
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### What equation governs the time boost of a distant object caused by local acceleration?

This isn't the time dilation aka rate change, but rather due to perspective change, where is Sam looking on Sally's worldline? For example, imagine Sam is 1000 lightyears from Sally and Sally is ...
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### How does the mirror clock work in an accelerating spacecraft?

I recall Feynman explaining time dilation in a moving spacecraft using a clock which counts reflecting light. As I understand it, to a stationary observer the path the light takes is longer than it is ...
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### How a particle moving in an straight line is perceived in a rotating frame of reference?

Imagine two reference frames that share same origin. One is static (S frame) and the other one is rotating (S' frame) with $\mathbf \Omega = \Omega_0 \mathbf k$. Imagine we throw a ball in an straigth ...
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I assume that an observer moving with velocity $\mathbf{v} = v\mathbf{n} = \mathbf{v}(t)$ (with respect to another observer) has coordinates where $x^{\mu}$ are the coordinates for the observer who ...