# Questions tagged [acceleration]

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

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### Estimating the displacement/force of a string (eg. guitar, piano) being struck by a mass (eg. by hammer or plectrum) at a given initial velocity

I have created a string audio synthesizer (eg. guitar, piano) based on physical modeling. It incorporates modeling for all the major phenomena that characterize a string. This includes things like ...
367 views

### 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 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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### Law of motion of accelaration applying average velocity

Consider the law of motion of acceleration: $s=1/2at^2$ Develop the law decomposing the acceleration: $s=1/2 * (V/t) *t^2 = 1/2*(V*t) = V/2 *t$ So we can say that the space is the moltiplication ...
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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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### 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 ...
816 views

### 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: ...
299 views

### 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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### How to read double integrator equations?

From what I understand, double integrator is a model where some entity can move according to some speed, which depends on the acceleration force exerted on the entity. If someone would ask me to ...
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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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### Is constant acceleration not enough for radiation?

A reference source: Does A Uniformly Accelerating Charge Radiate? Consider the behavior of a DC current compared to an AC current. Direct current: has locally fast moving free electrons that ...
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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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### Newton's Principle of Determinacy (intuitive explanation)

I was reading Arnold's Mathematical Methods of Classical Mechanics. In it he speaks of "Newton's Principle of Determinacy". He says for a mechanical system (collection of point masses in 3D Euclidean ...
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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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### 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 ...
3k views

### 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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### 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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### 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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### Analysis of a spring-block motion when the point of suspension is accelerating vertically upward

I was taught to apply a "pseudo force", [which is equal to mass × acceleration (of point of suspension)] in the direction opposite to the point's acceleration and then proceed the way I ...
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### Is radial velocity parallel to radius of curvature or the position vector?

I'm a bit confused regarding the directions of velocities and acceleration in curvilinear motion. Assume a curvilinear motion, which is not circular. I know that tangential component of velocity and ...
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### What what will happen to the height of the Mercury column in a barometer when it is accelerated upwards?

What will happen to the height of the Mercury column of a barometer when the barometer is accelerated upwards assuming the value of g does not change with height? I think the height will remain same ...
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### Linearity in acceleration in kinematics (Intro to Physics)

I am a student in an Introduction to Physics class, and I have the following question which I am confused about, and how two parts of the answers relate to each other. (We are doing 1d kinematics) A ...
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### In terms of being on an elevator, velocity, acceleration and forces, how are they related?

Before you answer, read this: Say you are on an elevator, and for some reason, when in it and you jump, you have a different velocity from the elevator, say the elevator is at 15 MPH and you are ...
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### Acceleration transformation in special relativity

I am having a hard time understanding the transformation of acceleration when it is not parallel to the instantaneous displacement of the particle, in particular the its dimension. Suppose a particle ...
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### Calculating the position of an object given object's initial position and velocity influenced by given acceleration vectors

The red circle is being pulled by two gravity points. Assume that the red circle has a given position (x,y) and a given velocity (vx, vy). I need to calculate the velocity and position of the red ...
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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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### Question about acceleration equations that can be used for a single object

Can the centripetal acceleration equation $a=\frac{v^2}r$ and the acceleration due to gravity equation $a=\frac{Gm}{r^2}$ be used interchangeably to find the acceleration of a single object?
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### Formula for deceleration of a car with transmission disengaged

Related to this answer to a question about the speed of an accelerating car, I'm looking for a formula for the speed of a car decelerating in neutral (with the transmission disengaged, i.e. no torque, ...
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### Determining acceleration in order to meet a space-time-velocity reservation

An Example A train on a single line track is told to be at position $x_{res}$, at time $t_{res}$, and to be moving at exactly $v_{res}$ when it hits that point. Where $_{res}$ denotes the reservation....
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### Accelerometer vs linear acceleration during an impact

I am trying to understand the relation between the accelerometer and linear acceleration during impacts. At work we have an accelerometer and gps onboard sensors installed in a few cars. The ...
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### Why does the equation for transformation of relative acceleration from one non-inertial system to another involve absolute angular velocities?

It seems that the equation for transforming between two different expressions of the relative acceleration of a vector involves absolute angular velocities, which I find surprising. Consider two non-...
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### Graph analysis of accelerometer data

I used my mobile accelerometer sensor to collect data from a moving bike where I held it in my hand in a way that the smartphone sensor +Y axis is in the direction of the moving bike always. This can ...
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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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### How two observers on different gravitational fields would observe each other?

As far as I know (from what I have heard) time passes differently (faster or slower) depending on the gravitational field of the observer (or an acceleration). So my question is, if an observer was ...
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### Having some trouble with acceleration in polar coordinates

So, I solved a question about acceleration in polar coordinates, but most people in my class (Classical Physics, first year at university studying Physics) disagree with my answer. So the question is ...
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### How does this toilet lid work?

After further reflection after closing the lid on my toilet, I noticed it exhibited a behaviour that I can't explain. When you let the lid fall, it falls at a constant speed regardless of its angle. ...
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### Cylinder rolling down an incline in a vacuum

Say you set up an experiment with an inclined plane, and a cylinder rolling down the plane. Let's also let the experiment happen in a vacuum, such that there is no air friction. However, let there be ...
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### Acceleration statistics at thermal equilibrium for a simple atomic system

Consider a case of a simple liquid, say argon or Lennard--Jones potential. What are the statistical properties of acceleration at equilibrium? For example, acceleration distribution or a correlation ...
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### Acceleration in general relativity

Let's say that, from my point of view, another observer is accelerating. Now, from his point of view, he is standing still: all he feels is an overall fictitious force of gravity, which is just a ...
Case 1. : The rocket is weightless in space. It's fueled with propellant. It's wet mass is starting mass $m_s$ and dry mass final mass $m_f$. Suppose rocket's initial velociti is 0. The rocket ignites ...