Questions tagged [acceleration]

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

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5 answers
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Does horizontal acceleration affect gravity?

If we apply 1G horizontally in some object, will this constant force equal to G affect the time of falling? If the force does not affect gravity, why gravity is prioritized over this force if both are ...
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Simple Harmonic Motion: What is the velocity, acceleration and restoring force of the object? [closed]

In simple harmonic motion, if a wooden block moves from point Z to Y, what will be its direction of velocity, acceleration and restoring force? Velocity, Acceleration and Rf depends on where is the ...
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Why I can't directly calculate the relative acceleration of F on the rotating Gear A? [closed]

In problem 16-131 Why can't I calculate the acceleration of point F (Shown in the F.B.D) Figure e, directly from rotating gear A, using relative acceleration? If I calculate it on the rotating Gear A ...
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Finding acceleration and tension of a system with a balloon and object binded to it by a thread [closed]

I have this system (there is helium in the balloon) and I need to find the acceleration of the system and the tension of the thread. For the acceleration I've wrote the following equation: $$m_{obj}\...
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Proof of the period of the simple pendulum [closed]

Recently I saw a video or a way to prove $$T=2π\sqrt{\frac{l}{g}}$$ but I'm very much confused about some steps. The way they showed was to start with $$mg\sin(\theta)=kx$$ which was fine to me to ...
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Why does a small thermocol ball fall slower than a metal ball of the same volume and surface area (air resistance equal)?

Suppose a thermocol ball and a metal ball of same volume and surface area (but different masses, obviously) are dropped from the same height from rest. The acceleration due to gravity is 'g' and the ...
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If you drop a coin inside a car that is slowing down, where will the coin fall?

If you drop a coin inside a car that is deccelerating, where will the coin fall with respect to the vertical where you dropped it? My thoughts where since it still has a velocity forwards, even ...
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Need some simple clarification [closed]

I get so confused because I look at an equation like $F=ma$ and think, what are the chances that mass "multiplied" by acceleration equals force. What am I missing here?
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Can we determine if a reference frame is inertial or non-inertial by looking at an accelerating object? [closed]

if we find that in a given frame, an object being acted upon by a force and is accelerating with respect to the frame would that mean that the reference frame in which this object exist is inertial or ...
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When can we consider two different body as a Single system in mechanics?

I am High school Student. During Newton's Laws of Motion , my physics teacher said me that When two bodies have different acceleration then we will not consider those two bodies as System. Then my ...
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2 answers
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Shouldn't gravity simulations solve for acceleration instead of force?

I'm learning computer programming right now, and one of the exercises I've seen quite a few people do is simulating gravity in space: i.e. planets orbiting a sun. All of the simulations of this kind ...
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1 answer
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$F = ma$, instantaneous Vs average [closed]

Are $\vec{F}$ and $\vec{a}$, in $\vec{F}=m \vec{a}$ instantaneous or average values (with respect to time)? As F=ma is short for change in momentum/time, surely $a$ is an average?
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Lorentz transformation for non-inertial frame of reference

Imagine two reference frames S and S' which have a constant relative velocity v between them. But neither S nor S' is an inertia frame of reference, S has a constant proper acceleration a along the x-...
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How can acceleration in special relativity be uniform?

Acceleration is defied as the rate of change in velocity, implying that $v(t) = at + v_0$. Say that an object is accelerating at $5 m/s^2$ with respect to an inertial frame in special relativity. ...
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Confusion - How does a object move, when there is no force acting on it? [closed]

Question: When for a moving object, $a=0$ it actually means (resultant Force=0) and that there's no pure force acting on it, and it's here where I get confused: If there's no pure force acting on the ...
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Can surface plasmons be used to build GeV gamma-ray lasers

I read a paper about coherent surface plasmon amplification by free electron pumping in an article a few days ago. It seems to work as some kind of free electron laser-like light source, and I wonder ...
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1 answer
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Body free fall calculation of the time durance as a direct derivation by time (non-relativistic)

Let's assume a body in free fall during 16 meters without resistance and I'd like to directly calculate the time of this fall. Sure, one could painfully calculate: $v^2 = 16 m·9.81 \frac{m}{s^2}$ $v = ...
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Defining inertial and non-inertial reference frames

This is not the first time I am studying classical mechanics but the idea of reference frames has always confused me, more so after studying a bit of relativity. I'd really like it if you could clear ...
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3 answers
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How does gravitational potential relate to gravitational acceleration?

I've been wondering about what the gravitational potential V actually tells us, and how it relates to gravitational force and/or acceleration. The formula is $V = -\frac{GM}{r}$. I did some ...
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1 answer
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Is there a difference between 10kg weight exerting 98N force vs. a person pulling the string with 98N force? [closed]

My question is related to an AP Physics question (2.k acceleration of systems), which appears simple, but the premise of part 2 of the question is difficult to understand, hence asking the physics ...
2 votes
2 answers
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Does a linearly accelerated observer inside an inertial spherical charged shell detect an electric field?

The electric field inside a charged spherical shell moving inertially is, per Gauss's law, zero. If the spherical shell is accelerated, the field inside is not zero anymore, but it gains a non-null ...
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2 answers
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What is the real difference between radial and tangential acceleration?

So in my physics coursebook there are two different kinds of derivation of $\frac{dv}{dt}$ of a particle rotating in a circle. Most of you will know these, they are what is called centripetal/radial ...
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At what scale would the metric expansion of space have an observable effect on objects bound by gravitational forces?

Elsewhere on this exchange it has repeatedly been asked in what ways metric expansion manifests in objects bound by forces, and has been answered as such objects experienceing a negligible increase in ...
6 votes
7 answers
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Is force really considered a push or a pull?

If an object is pushed/pulled at a constant velocity and it doesn't accelerate, is there a net force still being applied to the object? A force is a push/pull so there must be a force, despite there ...
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3 answers
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How do we prove that the 4-acceleration transforms as a 4-vector in Special Relativity?

In order to define the acceleration of a body in its own frame, we need to first prove that the acceleration is a four-vector so that its dot product with itself can then be labeled as acceleration ...
6 votes
4 answers
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How can I write the vector form of this equation, $a = vdv/dx$?

My Physics teacher was deriving the 'Work-Energy Theorem' for a single particle in the class; where after doing the vector addition of all the forces acting on the particle, he put the resultant of ...
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Path reconstruction from accelerometer and gyroscope data

I found a dataset here whose columns are attitude.roll, attitude.pitch, attitude.yaw gravity.x, gravity.y, gravity.z rotationRate.x, rotationRate.y, rotationRate.z acceleration.x, acceleration.y, ...
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Is pressure at all points same in a non-accelerating fluid?

That's basically the question. If the container of a fluid is not accelerating, then can we say that pressure at all points inside the fluid is same?
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1 answer
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If a spring is connected to a block and the other end is fixed, what's the force on the object after releasing the spring from a stretched position? [closed]

A spring is connected to a block and the other end of the spring is fixed, if the block is pulled with a hand, thus stretching the spring, what would be the force applied to the block once the hand ...
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Duration of a projectile shot up the ZARM tower, from entering the drop tube until exiting again, vs. duration of the tube being occupied by this proj

In the basement of the ZARM Drop Tower in Bremen, Germany, there's a high-tech catapult! ... This catapult can be used to launch a payload (projectile $P$) flying (freely, initially upwards) into the ...
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2 votes
4 answers
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EM radiation from monopole v.s. dipole

I'm confused about two conflicting ideas: the first is that monopoles cannot emit EM radiation (see here), and the second is that an accelerating point charge does produce EM radiation (see here). I ...
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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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3 answers
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How can perpendicular acceleration change the direction of velocity without changing its magnitude?

Recently I asked this question that how perpendicular acceleration can change the direction of velocity without changing its magnitude, one of the explanation was for a small interval of time that ...
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1 answer
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Clear explanation of acceleration of the earth

The Earth rotates with an angular velocity of $\omega$. My questions: Is the angular acceleration of the Earth equal to $0$ because angular velocity is stable? What is the difference between angular ...
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6 answers
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I am confused about Newton's second law $F=ma$

If I push or pull a statue at steady speed, the force, $F=ma$, would be equal to zero since I am not accelerating. Doesn't that make the quote "Force is a push or pull" not true, since there ...
1 vote
1 answer
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Blueshift in a rotating frame

The edge of a spinning disc with sufficiently low mass to exclude gravity effects emits a light signal received in the center of the disc. Does the acceleration towards the center imply that the ...
2 votes
4 answers
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Mathematical proof for: Acceleration always orthogonal to its velocity changes its direction

Whenever I ask this doubt that how can force perpendicular to objects velocity can change its direction but cant change its magnitude I get proof for only the magnitude will be constant that is: no ...
-1 votes
2 answers
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If we vibrate a charged mass, will it radiates or not? [closed]

It is said that electromagnetic radiation created from accelerated charged particle. I want to mechanically vibrate a charged mass , then will it radiates or not?
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7 answers
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I'm having trouble understanding the intuition behind why $a(x) = v\frac{\mathrm{d}v}{\mathrm{d}x}$ [duplicate]

I was shown \begin{align} a(x) &= \frac{\mathrm{d}v}{\mathrm{d}t}\\ &= \frac{\mathrm{d}v}{\mathrm{d}x}\underbrace{\frac{\mathrm{d}x}{\mathrm{d}t}}_{v}\\ &= v\frac{\mathrm{d}v}{\mathrm{d}x} ...
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1 answer
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Does the weight of a car increase under cornering? [closed]

Lets say we have a car with a mass of 1000kg, and lets say the car turns a corner fast and pulls around lateral 3g. Since under normal condition car weights 1000 x 9.81 (1g) = 98100 Newtons , will the ...
3 votes
2 answers
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Are all objects freefalling at the same rate inside a black hole?

We know the phrase "all objects move at the same rate when freefalling regardless of their mass" (interestingly this isn't even true because the objects are exerting their own gravity, but ...
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Can anyone help me with the diagram for task b? (Vector diagram.)

A jet-ski negotiates an S-bend of two arcs, with radii of 52m and 76m respectively. The speed of the jet-ski is a constant of 30 Knots. a) Determine the change of acceleration when leaving the first ...
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1 answer
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Does photons accelerate from $0$ to $c$? [duplicate]

I recall that whenever an electron in a higher-than-normal orbit falls back to its normal orbit and produces photon. So shouldn't the photon accelerate from 0?
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2 answers
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How is infinite acceleration implied when an object rebounds instantly with the same speed?

I was solving exercises on Physics Part I: Textbook for Class XI, NCERT, ed. July 2021 when I came across the following question: A particle in one-dimensional motion with constant speed must have ...
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1 answer
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Does acceleration acting on velocity only change direction or magnitude both? [duplicate]

Recently, I came across a text of a book saying that acceleration acting perpendicular to a velocity only changes the direction of final velocity and not the magnitude. But according to my ...
-2 votes
1 answer
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In the twin paradox without acceleration, how is the symmetry broken? [closed]

In the twin paradox without acceleration, where $A$ is "stationary", and $B$ makes a journey and then turns back, we can just as easily suppose $B$ is stationary and $A$ is the one who makes ...
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1 answer
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Determining the trajectory of a particle given the tangential and normal accelerations

Consider a particle with tangential and normal accelerations $\vec{a_T}(t)$ and $\vec{a_N}(t)$ respectively ($t$ is time). If the initial velocity and position vectors are both $\vec{0}$, how can the ...
1 vote
1 answer
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Speedometer Dilemma [closed]

This is what is written in Resnick Halliday Krane Physics Vol.1 The speedometer of a car indicates it's speed, not it's velocity, because it does not specify a direction. Speed is a scalar, since it ...
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2 votes
1 answer
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What happens if I rewrite the acceleration in work formula this way?

Work is known as \begin{equation} W=\vec{F}.\vec{q}, \end{equation} thus for a gravitational force $\vec{F}_g=m\vec{g}$ we have \begin{equation} W=mgh. \end{equation} My derivation is as follows: \...
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2 answers
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If I dropped a golf ball straight down from about 5 meters, would air resistance cause a noticable change in the acceleration of the ball?

I am working on a Grade 11 physics lab report. I dropped a golf ball from a balcony 5m and 13cm off the ground. When I did all the calculations, the acceleration was 7,72m/s (calculations below). I am ...

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