# Questions tagged [acceleration]

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

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### Discussion - Why will an object move downwards inside a rocket moving upwards?

Suppose a rocket is launched upwards , and an object (say on the top of the rocket, inside the rocket) is at rest. If i'm correct , as soon as the rocket starts moving upwards , the object would ...
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### Need of describing the term acceleration [duplicate]

What is the need of acceleration when we have velocity As I think velocity as 1m/s means 1m covered in 1s and 1m/s^2 means 1m covered in 1s per 1s this statement creates confusion when it comes to ...
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### What is the need of acceleration? [on hold]

As we can usually predict the various forces that a body might be undergoing based on its position and its velocity.Hence what is the need of acceleration?
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### Why are you accelerating yet remaining at a constant speed while going around a curve? [duplicate]

We have to write a rap in physics, and it has to answer a prompt he gave us on this packet. The prompt for the verse I am writing is: Pretend you are driving a car on the freeway going 65 mph. The ...
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### Why do accelerations due to gravity and external forces get added during upward motion?

Suppose there is guy in an elevator, who has a mass of 100kg. The elevator is ascending with an acceleration of $10m/s^2$. What would be the apparent weight of the guy? Now, my resources tell me ...
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### How do you calculate how heavy you feel from negative g forces? [duplicate]

My physics tacher told me that to calculate the weight that you feel from negative g forces you have to devide your mass by the negative g force, but then my friend told me that it did't make sense ...
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### Unreachable relavistic particle in accelarated motion

Let's say I have a particle in a uniformly acclerated motion such that $$a_\mu a^\mu = -g^2, \quad g > 0\ {\rm and\ constant} \tag1$$ I want to prove that any signal coming from a apace-time ...
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### Time dilation calculation in the relativistic rocket

Rindler coordinates are useful for describing objects moving at constant acceleration: \mathbf{x} = \begin{pmatrix} t \\ x \end{pmatrix} = \begin{pmatrix} \xi\sinh [\alpha \zeta] \\ \...
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### Two objects undergoing proper acceleration

Is there an inertial frame ($x'$, $t'$) in which two objects undergoing proper acceleration in the positive x-direction (e.g. starting from rest at $t=0$ from $x=0$ and $x=L$) where the two objects ...
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### Why doesn't the Earth accelerate towards us?

According to Newton's third law of motion that states that every action has an equal and opposite reaction. So, if the Earth exerts a gravitational pull on us (people) then even we should exert a ...
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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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### Feynman Lectures on Physics: Vol 1, 11-6: acceleration vector

I’m trying to get through 11-6 section of Feynman’s Lectures on Physics, Vol 1, particularly explanation of acceleration vector calculation in his example: It’s clear that acceleration ...
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### What is the significance of infinite acceleration in this case? [closed]

the Question is as follows: Pick the correct statement: (a) The average speed of a particle in a given time is never less than the magnitude of the average velocity (b) It is possible ...
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### Why doesn't an accelerating body on collision come to rest immediately? [closed]

Let us consider two bodies (A and B) lying on a surface at a certain distance from each other. Let A be accelerating to the right, towards B and hence, the force experienced by A be F. When A collides ...
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### Should not the acceleration acting on the stone being dropped be $a$ as well along with $g$?

the question is: A stone is released from an elevator going up with an acceleration a. The acceleration of the stone after the release is (a) a upward (b) (g-a) upward (c) (g-a) ...
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### Weight in an elevator accelerating downwards with $2g$

I am aware of the classical apparent weight physics but I am confused about what happens when elevator falls with greater acceleration than g say two g or something.if I calculate the normal force it ...
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### Adjusting Newton's laws with relativity concepts

I break my question into three parts, with increasing "guessing status". Please tell me which of them (is any) is correct. Suppose I am an observer in an inertial reference frame, away from all other ...
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### How and why the acceleration of the ball during contact is different from $g$?

The Q is: My teacher said that the acceleration of the ball during the contact will be different from 'g' and therefore we have to treat the downward motion and upward motion separately . My ...
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### Is the word 'acceleration' used for both increasing and decreasing velocity? [duplicate]

the question was: "if a particle is accelerating, it is either speeding up or speeding down. do you agree with the statement ?" and this is what our teacher told us: "This statement cannot be ...
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### Why doesn't accelerating reference frames in QFT lead to horrible paradoxes?

Background So I remember that in Special Relativity while one can define acceleration things can go horribly wrong has happened historically (I'm sure there many other paradoxes). The real reason of ...
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### How to remove gravity component from accelerometer $X$, $Y$ readings?

So I have an accelerometer which I am wanting to use in an IMU. When the device is tilted but stationary I want the x, y values to be 0, so effectively negate the effect of gravity along the x and y ...
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### Under the constraint that the 4-acceleration is constant in each instantaneous rest frame [closed]

Suppose a particle is in a global inertial frame and moving in the $x$ direction, starting from rest at $t=0$. Under the assumption that the 4-acceleration of the particle in its each instantaneous ...
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### Why is $g$-force pointed downward during upward acceleration?

After a recent physics project in school, where we worked with rollercoasters (it was rather simple questions, about where you would fell the heaviest, lightest etc.) I was reading about g-forces on ...
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### How to calculate accurate yaw using Magnetometer and Accelerometer

I'm currently using mobile device accelerometer+gyro+magnetometer attitude to get roll, pitch, and yaw. However, yaw is drifting and becoming not accurate over time. I read there is a way to ...
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### Which clock is the fastest inside an accelerating body?

The picture shows an accelerating spaceship with two clocks inside it. It is so far away from all other bodys that gravity is of no importance. Will the bottommost clock be slower than the topmost ...
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### Model of road disturbance in term of normal force

According to this article Channe, S.S. and Kshirsagar, S.D., Modeling and Simulation of a Suspension System for Different Road Disturbances, the best model for disturbance of a road is in the form of ...
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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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### Question about derivation of kinematics equations

Apologies if this has been asked before, but I browsed the sub and couldn't find something specific. I understand the derivation for one of the equations as follows: \begin{gather} \frac{dv}{dt} = a ...
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### Could a mass of osmium be used to create a 0g room on Earth?

Is it possible for a super dense element (such as osmium) to cancel out earth's gravitational field, and create a room without gravitational acceleration?
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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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### What exactly does accelerometer measure on a vertical rotating disk?

I am trying to understand an aspect of rotational dynamics. I am having some trouble arriving at a solution. Consider a disk of uniform mass distribution, and radius R centered at the origin of an xy ...