Skip to main content

Questions tagged [acceleration]

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

Filter by
Sorted by
Tagged with
-1 votes
2 answers
24 views

Components of velocity in projectile motion [closed]

I came across this question in my physics textbook (Gr12) and I was hoping someone could explain the solution to me A ball is thrown horizontally off a building at $8.2\,\text{m}/\text{s}$. At a ...
Nathan's user avatar
  • 1
0 votes
2 answers
81 views

Radiation from acclerated charged

I was wondering if I sit on a accelerated charge particle I will not observe radiation since particle is at rest acc to me. But my friend observe it from outside he will see radiation since it is ...
physics's user avatar
  • 37
0 votes
2 answers
39 views

Is retardation reported with opposite sign as that of acceleration?

Does retardation have opposite sign of acceleration? For example if acceleration of a car is 15m/s² than if we are asked to report retardation will we report it as -15m/s² or simply there is a ...
NOTE Book's user avatar
1 vote
2 answers
44 views

Does coordinate acceleration match proper acceleration when $v=0, s=0$?

Alice and Bob are riding in their rocket at arbitrary proper acceleration through an arbitrary region of spacetime. Bob steps out of the space ship right next to Alice, such that at $t=t'=0$, $v=0$, ...
g s's user avatar
  • 13.8k
5 votes
3 answers
624 views

Special relativity and accelerating twins

Imagine two twins synchronise their clocks and then twin A quickly accelerates to velocity v. After a time T twin B quickly accelerates to 2v and catches up with twin A. Which one will be younger? How ...
Moji Ghadimi's user avatar
0 votes
1 answer
52 views

Covariant Directional Derivative

How is the covariant directional derivative $\frac{D}{d\lambda}=\frac{dx^{\mu}}{d\lambda}\nabla_{\mu}$ in GR related to acceleration? I am motivated to ask this question because I’ve seen it stated ...
ICOR's user avatar
  • 69
0 votes
0 answers
22 views

Removing gravitational force of an accelerometer measurement [closed]

I'm trying to recreate a 3D path using a Gyro and Accl sensor of a GoPro in Blender. The rotation is already working but I stumbled across a small problem when I was looking at the Accl data and the ...
lostnumber's user avatar
1 vote
3 answers
127 views

Is there a maximum angular acceleration due to gravity for a given radius?

I'm having trouble understanding the relationship between angular acceleration and tangential acceleration, specifically, how can an angular acceleration created by the tangential acceleration of ...
JIMBO's user avatar
  • 11
2 votes
0 answers
65 views

Will glass bottle survive being thrown into water? [closed]

Will this glass bottle survive, being thrown off a $15 \,\text{m}$ tall bridge onto water, assuming it will hit the water at the worst possible angle? The glass bottle is well built, has a size of $1 ...
stoldo's user avatar
  • 29
1 vote
0 answers
57 views

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 ...
Ethan Brown's user avatar
0 votes
0 answers
55 views

How exactly does Newton's second law work? [duplicate]

I had to do a reading on rollercoasters in class and it includes Newton's second law. Firstly, the reading states that acceleration depends on the magnitude of the force and the mass of the object, ...
user386598's user avatar
0 votes
5 answers
89 views

Motion formula gives correct answer but without formula gives wrong answer [duplicate]

Assume a body with initial velocity= 10 ms final velocity= 20 ms and acceleration= 2 ms , so the time to reach final velocity will be 5 seconds. If we try to find distance it will travel in 5 seconds ...
nitu sahay's user avatar
0 votes
2 answers
43 views

Confusion about acceleration when pulling a massively long object in space

I have this thought experiment that I just don't manage to solve. I'm sure there have been similar questions and answers, yet I haven't found any that explained it to me. I have no particular physics ...
Sreckcep's user avatar
0 votes
3 answers
50 views

Resolving gravitational acceleration

I came across a problem in physics where I had to find the acceleration down an inclined plane. I started by considering $g$ as one of the components, and the one along the inclined plane as the ...
aakansha bahuguna's user avatar
0 votes
2 answers
40 views

Equations of motion for constant acceleration

I read that the equations of motion for a constant acceleration can be represented in a scalar form as well as a vector form, but what's the need to do them in vector form what extra can we do by ...
Manish's user avatar
  • 37
1 vote
0 answers
20 views

Does a charged particle under constant acceleration produce electromagnetic waves? [duplicate]

A charged particle at rest does not emit any electromagnetic waves. It is generally said that an accelerated charged particle does produce electromagnetic waves. But according to Einstein's Principle ...
Rudransh Joshi's user avatar
2 votes
1 answer
47 views

What if acceleration changes in the Unruh effect?

Based on the Unruh effect, when a observer accelerates then he will see a thermal bath. mathematically the vacuum state for a non-inertial observer is $$|0\rangle=\text{cos}^{-1}(r)\sum_{n=0}^{\infty}\...
reza's user avatar
  • 187
0 votes
0 answers
35 views

Why doesn't a body with uniformly varying velocity give total displacement [duplicate]

For a body moving with constant acceleration of 1 m/s2, the velocity of the body increases by 1 m/s. After 5 seconds, its velocity would be 5m/s. As the velocity was changing by 1m/s I just thought to ...
Sai Varun 's user avatar
14 votes
4 answers
2k views

Why doesn't constant acceleration give me total displacement?

I started learning 1D kinematics and learnt definitions of constant velocity and constant acceleration. I thought that if a particle is changing its velocity uniformly then it has constant ...
Sai Varun 's user avatar
0 votes
2 answers
74 views

Why can't we have accelaration in the form of meters per minutes*seconds?

I have been pondering over a concept regarding the general formula for acceleration, which is widely accepted as $\frac{m}{s^2}$. This formula elegantly illustrates that a given mass or body is ...
Sambhav Khandelwal's user avatar
1 vote
3 answers
104 views

Force excerted on 2 objects travelling with same acceleration

Suppose two objects A and B are travelling on a smooth surface (in a linear path) with the same acceleration. B is behind A and having contact with A. (Both A and B have separate unbalanced forces ...
Yara Try's user avatar
  • 145
-1 votes
1 answer
96 views

How to Find Trajectory of Particle?

Let’s say I have a particle, and I know all the forces acting on it at every position. (Let’s say the particle is in an electric/gravitational field to simplify the mathematics involved.) Now, is ...
V T Naveen Mugundh's user avatar
0 votes
1 answer
47 views

Angular acceleration of a pulley [closed]

This is the way I solved but the answer seems to be different. Torque = $Iα$ Torque = $Mgr-\dfrac{Mgr}{2} = \dfrac{Mgr}{2}$ $\dfrac{3}{4}Mr^2 = \dfrac{Mgr}{2}$ Cancelling things give, $α = \dfrac{2g}{...
Dinuwara Binudith De Silva's user avatar
1 vote
1 answer
47 views

Einstein's 1st postulate, Faraday's Law

I had a question about using Faraday's law as an example to explain Einstein's 1st postulate - the laws of physics are the same in all inertial reference frames. The example given in the textbook is ...
Freddie's user avatar
  • 372
4 votes
2 answers
362 views

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 ...
NaiDoeShacks's user avatar
0 votes
0 answers
20 views

A travelling magnet passing through a static ring magnet, overall net acceleration question

If I have a magnet travelling through empty space, and it passes through a static (infinite mass for all intents and purposes) ring magnet, in such a way that it is being attracted towards the ring as ...
marc morgan's user avatar
2 votes
1 answer
51 views

Centripetal acceleration of centre of mass towards instantaneous axis of rotation (IAOR)

When an object purely rolls on a horizontal surface, the centre-of-mass moves in purely circular motion, with respect to the instantaneous axis of rotation (IAOR). So does the centre of mass have an ...
Alex francis's user avatar
0 votes
4 answers
227 views

Why cars don't accelerate according to $F = ma$?

If a car is moving with constant speed, the wheels of the car exerts a constant force on the floor. Since $F = ma$, the car should be accelerating rather than maintaining the same speed. What is going ...
tharindu nilanga's user avatar
0 votes
2 answers
92 views

Can you reason the equivalence principle from SR?

So for the past few days I've been reading on "why is special relativity incompatible with gravity?". Most answers are something along the lines of "special relativity doesn't have ...
NaiDoeShacks's user avatar
0 votes
4 answers
98 views

Why acceleration is not always parallel to velocity but velocity is always parallel to displacement? [closed]

Velocity is derivative of displacement : $$\vec v=\frac{\mathrm {d\vec r}}{\mathrm dt}$$ And acceleration is derivative of velocity. $$\vec a=\frac{\mathrm {d\vec v}}{\mathrm dt}$$ Given that their ...
An_Elephant's user avatar
11 votes
4 answers
4k views

What is the correct formulation of Newton's Second Law of Motion?

Wikipedia states that Newton's second law of motion is: At any instant of time, the net force on a body is equal to the body's acceleration multiplied by its mass or, equivalently, the rate at which ...
liah's user avatar
  • 111
2 votes
2 answers
48 views

Relative acceleration in case of centripetal acceleration

Say there is a disc of radius $R$ which is rotating about its centre with an angular velocity $\omega$. Now the acceleration of a point on the disc at $R/2$ distance is $-\frac{\omega^2R }{2} \hat{r}$ ...
Alex francis's user avatar
0 votes
0 answers
28 views

When we are on the ground do we still accelerate with 9.8 m/s²? [duplicate]

Do we accelerate with 9.8 m/s² when we are on the ground , if so why we do not fall inside the eart . How is the net force is zero , how many real forces acts on the body ?
Pranjal's user avatar
0 votes
1 answer
42 views

Are there very high voltage very low amperage electromagnetic/electrostatic launchers?

Electromagnetic launchers (coilguns or railguns) use extremely high amperages and voltages, but I was wondering if are there very high voltage very low amperage electromagnetic/electrostatic launchers....
Fulano's user avatar
  • 277
4 votes
7 answers
2k views

Would objects really be at rest relative to each other in orbit?

I am currently reading Gravitation by Misner, Thorne, and Wheeler (MTW). In the very first chapter on weightlessness they make the following claim: “Contemplate the interior of a spaceship and a key, ...
Nethesis's user avatar
  • 145
0 votes
1 answer
69 views

On the equivalence principle

In its simplest version, it states that the effects of a uniform gravitational field are indistinguishable from those of a uniform linear acceleration of the frame of reference The thing is, you can ...
ric.san's user avatar
  • 1,592
0 votes
2 answers
130 views

Rindler coordinates and objects possibly exceeding the speed of light

Assume $c=1$ So I've been on a bit of a journey trying to derive special relativity by myself and in doing so was analyzing the viewpoint of a uniformly accelerating observer. I was particularly ...
NaiDoeShacks's user avatar
2 votes
3 answers
93 views

Showing that trajectories deviate from straight line in accelerated reference frames

Explanation of light bending in an accelerated frame in a relativistic setting We know the transformation that takes us from one inertial frame to another. In special relativity, the transformation is ...
Solidification's user avatar
2 votes
0 answers
18 views

Magnetic Acceleration due to Repulsion

My question concerns magnetic acceleration due to repulsion. My sketch below shows two Neodymium magnets that I am working with, Magnet A and Magnet B. Thir orientation is fixed so that they cannot ...
user136789's user avatar
3 votes
4 answers
214 views

G force roundabout question

If I'm driving and I want clear a roundabout as fast as possible, but I only can take so much G force before dying, do I drive in the inner or outer lane. Assuming that the maximum G force I can take ...
MiaLee's user avatar
  • 41
3 votes
1 answer
106 views

How is it possible that photons already move at the speed of light the moment they pop into existence? [duplicate]

This is a thought experiment and I might be horribly wrong. If we have an electron-positron annihilation a photon pops into existence. This photon is then supposedly moving at speed of light at the ...
Jurre Groenewegen's user avatar
0 votes
2 answers
44 views

Newton's Second Law: Does the mass mean both masses?

In Newton's second law F = ma, the mass is the object the force is being acted upon. But in a gravitational system, does that mean the mass of the object you are concerned with? For instance, if you ...
Astrovis's user avatar
  • 187
0 votes
2 answers
90 views

How can you use General Relativity to find the acceleration $9.81$ m$/$s$^2$ due to gravity? [duplicate]

Using the Schwarzschild metric and the mostly minus signature, how can I calculate the $9.81$ m$/$s$^2$ of acceleration on Earth using general relativity and the geodesic equation?
Kalix's user avatar
  • 1
0 votes
1 answer
75 views

In $a = dv/dt$, is $a$ the net acceleration? [closed]

While going through the calculus approach to accelerate, we have, $$a = dv/dt, $$ I think, here, v and a should be in the same axis, is my process correct? in a planar motion in two dimensions, it ...
sachin's user avatar
  • 1
1 vote
1 answer
49 views

Unruh Radiation from hovering?

I know that masses on their own don't produce Unruh radiation outside of black holes which produce a similar effect known as Hawking radiation. However, what if some observer hovers above the Earth ...
Roghan Arun's user avatar
  • 1,514
0 votes
0 answers
32 views

Does light accelerate? [duplicate]

If considering the general formula for acceleration, ie. Δ V/ΔT, we would get zero as the velocity of light is constant and does not change. However, what about when photons travel through different ...
Mel's user avatar
  • 113
0 votes
1 answer
56 views

What defines weightlessness feeling during a fall?

So I know that we feel weightless during a free fall as there's no normal force acting on us or my other way of thinking is that considering a lift and both lift and I fall with $g$ then no normal ...
Guess's user avatar
  • 91
-1 votes
1 answer
32 views

transverse acceleration?

Can someone define the transverse acceleration with an example and what is the difference between the transverse acceleration and the tangential acceleration , if it mentioned in a textbook i will be ...
Fadi's user avatar
  • 31
0 votes
1 answer
33 views

Which force acts on the hand and its direction in case of uniform circular motion? [closed]

Answer key: [Note: (Please verify this in your comments) The answer key for ii is wrong,right? It has to be non-uniform as the direction of the acceleration is everchanging.] now , for iii, I believe ...
Darshit Sharma's user avatar
0 votes
3 answers
96 views

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, ...
Fadi's user avatar
  • 31

1
2 3 4 5
62