Questions tagged [velocity]
The time rate of change of the position of an object
1,309
questions
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1answer
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A Second Geodesic Equation?
I have a question about the geodesic equations. I understand the following formulation of it:
$$\frac{d p^\mu}{d\tau} = - \Gamma^j_{v\mu}p^vp^\mu.$$
However, I was reading https://arxiv.org/abs/1305....
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2answers
66 views
If acceleration $a = v\cdot\frac{\mathrm dv}{\mathrm dx}$ , then why isn't acceleration always zero when velocity is zero? [duplicate]
We know that,
$$\begin{align}
a&=\frac{\mathrm dv}{\mathrm dt}\\[3pt]
&=\frac{\mathrm dv}{\mathrm dx}\cdot\frac{\mathrm dx}{\mathrm dt}\\[3pt]
&=v\cdot~\frac{\mathrm dv}{\mathrm dx}
\end{...
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0answers
63 views
Speed of the Earth through universe [on hold]
If two negatively charged spheres repel each other in the same way indipendently of Earth velocity does the movement of the Earth around the Sun which is at a short moment in direction with the Milky ...
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0answers
26 views
Is it possible to find the exact value of the dynamic viscosity of a fluid by applying Stokes' law?
I am a high school student who is investigating the dynamic viscosity of a fluid. Typically, high school physics model the dropping of a spherical object vertically into a viscous fluid with the ...
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0answers
47 views
A car covers 110 meters in 10 seconds then covers 140 meters in next 10 seconds.The acceleration is constant.Whats initial speed and acceleration [closed]
The car moves in a straight line. I have tried using distance, time, and speed graph but my teacher says it is wrong.
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5answers
126 views
Calculating mean velocity: using time or velocity?
Background
I have been running tests which involve timing an object moving a certain (fixed) distance, $s$.
Each test has been repeated 3 times, and the 3 times ($t{_{1}}, t{_{2}}, t{_{3}}$) for the ...
2
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3answers
95 views
Can the flow be irrotational if the viscous forces act on fluid?
I tried to answer the question only using the definitions and the Navier-Stokes equation:
$$\rho \frac{Dv}{Dt} = -\nabla P +\rho g -\mu[\nabla \times(\nabla \times v)] $$
In my opinion if the ...
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2answers
214 views
Is Velocity Really a Vector?
In non-relativistic physics, physical quantities $Q$ are characterized by how they transform under a Galilean transformation $g \in \mathcal{G}$.
$$ Q \rightarrow Q' = D[g]Q$$
where $D[g]$ is the ...
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2answers
107 views
What does it mean to velocity be a derivative of position? Isn't position a point, not a function? [closed]
So in mass-spring simulation I encountered that one simulates particles by using positions and velocities of particles etc.
By mechanics:
Velocity is the derivative of position.
But, isn't "...
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1answer
28 views
If I want to spin a disc or rod with an objective of high tip/edge velocity (of .1c) what are my limitations?
What are our limitations on being able to spin a disc or rod to create a relativistically fast tip/edge speed?
My thoughts are you should be able to increase the radius of the spinning object to ...
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0answers
26 views
Maximum acceleration on a turn
The question $\\$
Suppose a car enters a turn with an initial speed $\vec{v_1}$, and comes out with a final speed $\vec{v_2}$ perpendicular to the direction of $\vec{v_1}$. The driver does everything ...
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2answers
64 views
Alternative definition for Lorentz factor?
I have never encountered this before (encountered it now in Sean Carroll's GR text when discussing the benefit of solving problems in locally inertial references frame).
Let $\gamma$ be the Lorentz ...
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0answers
23 views
Calculating infinitesimally small volume of a sphere in velocity space
This link (at the end of the page) is deriving the formula to calculate an infinitesimally small volume $dV$ on the surface of a sphere with radius $v$ in velocity space. It states that $dV = ...
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2answers
81 views
Relative speed when getting close to the speed of light
I was thinking about the relative speed of an observation reference frame and an object which has been accelerated to a speed close to the speed of light. I'm by no mean an expert and the last physics ...
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2answers
103 views
How do you correctly apply $a=v\cdot\text dv/\text ds$? [closed]
I know that $a=v\cdot\text dv/\text ds$ can be deduced by simple algebra and calculus and is correct.
But once I was analyzing the motion of a ball projected straight up in free gravity. If I apply $...
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1answer
35 views
Relative motion between two particles
I already know the relation of relative velocity as :
Vab=Va-Vb
So is there any derivation for this relation or is just how it is defined?
Relating to this i am finding some hard time to imagine why ...
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3answers
59 views
Relative motion with relativity [closed]
In an inertial frame of reference (let's say a car moving with certain constant velocity in which I am sitting)
If I observe the motion of another car through my frame of reference i.e.car, will I be ...
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1answer
66 views
If we say “an object is at rest,” can we also say “the object is moving at a constant velocity?” [closed]
If we say "an object is at rest," can we also say "the object is moving at a constant velocity?"
Of course, the constant velocity would be zero, so it's mathematically sound. However, the wording ...
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4answers
1k views
What is the difference between uniform velocity and constant velocity? [closed]
I think that uniform velocity implies constant speed but not constant direction. while constant velocity implies constant speed without any changes in direction.
Both tell us that there's no ...
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1answer
38 views
A doubt regarding Modelling physical phenomena and position uncertainty
For example, in velocity, when we say $v=\frac{dx}{dt}$, there is no proof for it. Its almost like an axiom. Something taken to be true, without a proof. How do I know that for every $x=f(t)$, $v=f'(t)...
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1answer
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Freefall equations and forces
Consider a scenario where a 100kg mass is hanging from a rope. It's stationary, so the force it exerts on the rope is given by $F=ma$, where $a$ is the acceleration due to gravity, which works out to ...
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1answer
18 views
How do I calculate how strong of a field I need to repel a proton in a span of time
How do I calculate how strong of a field I need to repel a single proton in a given span of time, given that I know it's velocity.
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1answer
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What is the speed of air molecule?
Given the minimal temperature measured in the Earth's atmosphere is not $0\space K$, air molecules are moving. I see no reason for air molecule to move all at the same speed. The question is ...
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1answer
34 views
Wavelength of a particle [duplicate]
As we know wavelength of a particle is equal to (Planck's constant / momentum), so here momentum $= mv$ where $m$ is a mass of an object and $v$ is the velocity of an object.
What will happen when ...
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2answers
56 views
Why does kinetic energy below molecule bond energy break bonds?
I was thinking about why bullet can break molecular bonds when it hits solid target despite the fact that the kinetic energy of the individual atoms that make up the bullet is less that the molecule ...
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0answers
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How would one calculate velocity with respect to time in Case 2?
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 ...
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4answers
236 views
U-turn in Deep Space
While writing a physically realistic game ( "Asteroid Defender" ) a physical question came up whether Diag.1 or Diag.2 or Diag.3, correctly depicts reality.
In deep space (away from other celestial ...
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3answers
86 views
WHY did physicist defined velocity as displacement divided by time, why not displacement * time? [closed]
V=S/T. As per my knowledge i think ratio as division and it don't give any meaning like this much displacement in this much time. So i think physicists only used division as notion for velocity. But ...
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1answer
57 views
Is it possible to find $\mathbf{v}$ explicitly when $\mathbf{F}$ varies with $\mathbf{v}$?
I have the following problem (NO, this is not to ask for a solution to this problem).
A block is placed on a plane inclined at an angle $\theta$. The coefficient of friction between the block and ...
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1answer
21 views
Force on a particle with uniform velocity
Let's say a particle is moving in a straight with no acceleration in an inertial frame. By Newton's laws we know that the force acting on it must be 0.
But my question is, why doesn't uniform velocity ...
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14answers
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Does throwing a penny at a train stop the train?
If I stand in front of a train and throw a penny at it, the penny will bounce back at me.
For the penny to reverse its direction, at some point its velocity must go to zero. This is the point it hits ...
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0answers
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Do orbiting masses accelerate or decelerate (relative to us) near black holes? [duplicate]
Apologies if this question seems stupid; I was just curious after watching a documentary, and I am not a trained astrophysicist.
Simply put, I cannot reconcile the (perhaps misunderstood) facts that ...
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0answers
31 views
Constant Acceleration and Displacement
How can I conduct an experiment to show that the area under a velocity-time graph equals the displacement when the velocity is changing at a constant rate? I've tried to measure free falling objects, ...
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0answers
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Derivation of 4-velocity - where does this equation come from?
I'm a student working through a special relativity book. In a chapter of the book, they are deriving each of the components of a 4-velocity vector in terms of ordinary 3-velocity.
(Here $\vec{x}$ ...
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2answers
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How can I understand if an object stay (zero velocity) or moving with constant velocity (zero acceleration)
I thought a scenario like; lets say I am looking an object and there is nothing except this object. Is there a way to understand that if this object is stay on its position or if object moving with a ...
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0answers
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Why the velocity $v$ is taken as value and not as definition in special relativity equations?
Why the velocity $v$ is taken as a value and the definition of velocity not applied on a relativistic equations?
The equations of time dilation and length contractions as we know are
$$L = {L_0}{\...
3
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1answer
87 views
Is four velocity always given by $U^{\mu} = d x^{\mu}/d\tau$?
I was taught that four-velocity is defined as
$${\bf U} = \frac{d \bf x}{d\tau}$$
and that it has the components
$$U^{\mu} = \frac{d x^{\mu}}{d\tau}$$
where $d\bf x$ is the four displacement and $\...
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1answer
71 views
Partial Integration and the Levi-Civita Symbol
I'm currently working through the book Heisenberg's Quantum Mechanics (Razavy, 2010), and am reading the chapter on classical mechanics. I'm interested in part of their derivative of a generalized ...
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2answers
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Velocity-Dependent Potential and Helmholtz Identities
I'm currently working through the book Heisenberg's Quantum Mechanics (Razavy, 2010), and am reading the chapter on classical mechanics. I'm interested in part of their derivative of a generalized ...
0
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1answer
28 views
Braking power and kinetic energy
I am currently stuck at a part of a problem i set myself. I am trying to create an equation for the stopping distance with respect to the force applied to the braking pads. I currently have two ...
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3answers
351 views
Is the velocity of a string that is being rotated around a central point the same at any point on the string?
Say that you have a weight attached to a 2 metre long string, and you are rotating the weight at 5 m/s. Is every point on the string going to be rotating at that same velocity of 5 m/s, or is the ...
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0answers
70 views
Validity of the arclength definition of the four-velocity vector
In many textbooks & papers the four-velocity vector has the standard definition $$u^{\mu}=\frac{dx^{\mu}}{d\tau}$$
where $\tau$ is the proper time.
However, some textbooks define the four-...
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2answers
91 views
How to understand the process of the kinetic energy formula? [duplicate]
$$\frac{1}{2} mv^2 = K.E.$$
What is the purpose of $v^2$; why can't use $v$ instead?
Why this question is arising because of that I learned the whole process of speed= distance/time. (I know How it ...
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3answers
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Why a Box moving at Constant Velocity isn't doing Work?
This was a question from an A-Level past paper and the question is pretty straightforward.
I was in a hurry so I couldn't think much on this problem and chose $C$ as my answer, checked it on the ...
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1answer
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Time taken to reach common velocity - collision
Say for instance I have two objects with different masses that collide in-elastically the resulting velocity will be $ v =\frac{m_1 v_1 + m_2 v_2}{m_1 + m_2}$.
What I don't fully grasp is how to ...
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0answers
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How can the velocity of electrons in graphene be measured?
I'm trying to understand how one can measure the velocity of electrons in graphene, from an experimental point of view.
Does anyone have some clue?
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1answer
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Pressure in the pipe when the pool is draining out
I have a question: the situation is as follows: There is an open pool (in blue) to which a pipe is connected. The pressure above the pool is equal to the air pressure = 1 bar.
In normal configuration ...
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1answer
98 views
Relativistic mass effect
Does relativistic mass phenomena only appear while accelerating or even when the object is travelling at constant velocity (say 90% speed of light)?
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2answers
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Meaning of the term speed of light in context of an object of non-zero mass
We know from GR that an object of non-zero mass cannot propagate at light. I have a problem with the term speed of light. Does it mean the relative speed of that object with another object or frame of ...
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9answers
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The instant an accelerating object has zero speed, is it speeding up, slowing down, or neither?
This problem is from Khan Academy. Specifically for the blue point circled in red, the answer is that at this blue point, the object is neither speeding up nor slowing down. When I think about the ...
