Questions tagged [acceleration]
The rate of change of velocity of a body per unit of time.
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Electromagnetic waves accelerating reference frame
A charge is at rest in an inertial reference frame.
Consider this situation:
From the point of view of an observer who is accelerating relative to the charge. Would the observer observe ...
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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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Acceleration in terms of displacement
I am having problems understanding the derivation of acceleration in terms of displacement. The first step is fine:
$$a(x) = \frac{\mathrm dv(x)}{\mathrm dt}
= \frac{\mathrm dv(x)}{\mathrm dx} \frac{\...
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Does a charge radiate EM waves in non-inertial frame?
A charge at rest would not emit EM waves but an accelerated charge would. But what is the observer is itself accelerated, will charge radiate EM waves as laws of physics should be same for all ...
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Can we use relative motion if acceleration of two bodies are different?
Suppose, on the $x$-axis, a body $A$ is moving with velocity $v_1$ and acceleration $a_1$, and a second body $B$ is moving with velocity $v_2$ and acceleration $a_2$. $B$ is at a distance of $S$ from $...
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Possible to convert accelerometer $x,y,z$ measurements into quaternion?
I have an inertial measurement unit (IMU) with an accelerometer that reports the acceleration (a) along the $x$, $y$ and $z$-axis in milli-$g$. I can get the Euler angles for roll ($\phi$) and pitch ($...
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How to gradually calculate deceleration to reach velocity = 0?
I've tried to remember everything I could thats related to physics I've learned in school and college, but I'm failing. I'm currently trying to develop the physics of my own game (I could instead use ...
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Understanding the tidal force tensor
I'm just looking to gain a basic intuitive understanding of the forces at work in tidal stripping and their direction/motivation etc. I'm struggling to grasp the underlying principles and it is making ...
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What is the acceleration of expansion?
If me and my pet duck, who weighs next to nothing, were placed far away from any gravity source and in such a way that our mutual attraction was negligible, would I see my duck accelerate away from me?...
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Acceleration vector of tipping object (robot)
I am about to develop a simulation application of a robot.
For that reason, I would need to calculate the acceleration of the robot (centre of mass) when its centre of mass exceeds its feet (ie it ...
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How do we derive force/acceleration vectors from Einstein's field equations?
I'm new here and I don't have any formal experience in physics beyond A-level. I've been exploring an idea for a space sim game someone else is developing in which propulsion of a spacecraft is ...
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Shape and even connectedness of accelerating components in SR is frame dependent?
In some inertial frame consider a disk of radius 1 lightyear at rest. Then along the edge of the disk there are some people in spacesuits at rest hovering right above the disk (which has negligible ...
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Can you experience length contraction in an accelerating reference frame?
Imagine I am floating in space some large distance X above a neutron star or high mass object and I am using rocket boosters to stay stationary relative to the object. Assume no other forces acting on ...
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Is non-linear acceleration a necessary condition for an object to generate gravitational waves?
I was assuming every object that interferes with the gravitational field creates gravitational waves, and someone pointed out that only objects under acceleration do so. I searched through many sites ...
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Is there any electric field inside a charged conducting shell, which is uniformly accelerated?
I know that the electric field inside a charged conducting shell is zero. However, what if we accelerate the shell uniformly? Does the charge distribution remain uniform? If not, is it possible for ...
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If An Instantaneous Force Causes A Charged Particle To Briefly Accelerate, Does Self-inductance Decelerate It?
Consider the following example:
A charged particle initially at rest briefly accelerates in the forward direction due to an initial force. At this point the particle is carried forward only by inertia,...
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Is there a way to know if you accelerate in empty space or in a uniform gravitational field?
If I'm in a room that accelerates through empty space uniformly I won't measure tidal forces. The situation is the same as standing on an infinite massive plane. So I could think, while looking ...
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How to use a piecewise acceleration function to get a position function?
This should be a relatively easy problem but I think I am missing something somewhere. This problem consists of a object that is being thrown into the air at
$t = 4s$ at a velocity $v_0$
here is my ...
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If someone in freefall towards earth used a telescope to look at someone in a spaceship accelerating at 10m/s/s, would they see their clock run fast?
Basically I'm quite confused about relativity haha. I've been told that the only two things that affect whether you'll observe someone else's clock ticking at a different rate than yours are
Your ...
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Does power consumption vary over time as a projectile travels down the barrel of a rail gun?
My assumptions (possibly incorrect) for a rail gun are that are that the mass of the projectile is constant, the current through the armature is constant, and the magnetic field strength along the ...
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Why do self-propelling objects decelerate when a large impulse is applied to it?
I swim frequently. Whenever I push off a wall and start kicking, I keep decelerating until a point, where my velocity stops decreasing and starts increasing again. I tried this with rockets too (in ...
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What combination of Poincare generators can be used to transform to a uniformly accelerating frame?
Is there a combination of Poincare generators which can be used to transform from an inertial frame in Minkowski space to a uniformly accelerating frame? i.e Are there some co-efficients (probably ...
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How to determine the minimum "Arrival Distance" given a maximum velocity, acceleration and jerk along with an initial velocity and acceleration?
Problem
Given the following:
$A$ - maximum acceleration.
$J$ - constant jerk (the rate of change of acceleration).
$v$ - initial velocity.
$a$ - initial acceleration (where, in practice, $a ∈ [-A, A]$...
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Is relativistic velocity "implicit" a slower velocity?
I don't wan't to go in a big mathematical approach here but more of a kind understand some implications of special relativity.
Since a object from a steady observer is time dilated and length ...
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Gravitational waves emitted by accelerating rocket
What is the gravitational wave luminosity of a rocket with mass $m$ (kg) accelerating at $\Delta v$ (m/s$^2$)? Intuitively, I expect the luminosity (in Watt) to depend on the mass and acceleration. ...
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How to measure the gravity component in all the three dimensions using three-axis accelerometer?
I am reading this research paper and trying to understand how the three-axis accelerometer MMA8452Q use in this study to estimate the gravity component for three-axis i.e. $a_x$, $a_y$ and $a_z$.
My ...
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Relative Acceleration in Schwarzschild coordinates
Place an observer in spacetime such that the feet of the observer touches the Schwarzschild radius and the head is $x$ meters away from the Schwarzschild radius.
I want to calculate the relative ...
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Does tilting a liquid develop shear stress on its surfaces?
Please help me these confusions I have.
If I tilt a cuboidal container containing an ideal fluid (non viscous liquid), does a shear stress develop on the liquid due to some shearing force acting ...
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How did Henry Kater measure distances down one part in $10^5$?
Wikipedia says that in 1817, Henry Kater was able to measure distances accurately enough to get at least five significant figures in a measurement of $g,$ suggesting that he could measure a distances ...
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Acceleration interpretation in accelerated frames in general relativity
I would like to know whether my physical interpretation of some dynamics in accelerated frames is correct.
In a frame with acceleration $a$ we have the metric
$$ds^2 = (1+ax)^2 dt^2 - dx^2$$
The ...
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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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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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How do 4-vectors change under an "accelerated" Lorentz transformation?
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 ...
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Unable to understand the relation between the accelerations of a particle in rotational and inertial frame of reference
I was studying about the derivation of coriolis force and centrifugal force for a particle i.e. the relation between the accelerations of a particle with respect to inertial and uniformly rotating ...
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Physics model for my tub of water demo
I want to setup a demo to show people an intuitive example of causal inference (Pearl 2009) using a simple experiment.
I have a tub of water with two accelerometers floating on the surface. In the ...
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How to find acceleration given power, velocity and mass?
Suppose we have an ideal vehicle with mass $m$ and power output $P$. Under ideal conditions, without friction, when the engine is running, $P$ is the time derivative of the kinetic energy of the ...
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Three velocity and three acceleration of particle
The following is written in $c=1$-units. Imagine that a particle is moving on a world line, parametrically described with its proper time as follows:
$$t(\tau) = b^{-1}\sinh(b\tau) \text{ ; } x(\...
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Is there a relationship between the magnitude of the velocity and acceleration vector?
Given a path, how do the magnitude of the velocity and acceleration vector along the path correlate? I am confused due to the fact that the acceleration is the change of velocity over time and in ...
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How is this approximation of gravity involving Rindler coordinates valid?
I have seen that it is possible to approximate the metric in the presence of a gravitational field by the Rindler metric:
Does a uniform gravitational field exist? Is there any acceleration in a ...
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Time dilation under constant acceleration
If I am given:
the distance of two points
the (constant) force being enacted on the object moving between those two points
how can I figure out:
the time it would take the object to reach the other ...
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