Questions tagged [displacement]

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2answers
52 views

What do we mean by displacement in real life?

I know, I know, reference frame and shit. But, I am asking which one are we calculating? When we are calculating we are using Euclidean Geometry. So how should we think about it in form of Spherical ...
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2answers
33 views

What will be the work if somehow displacement becomes zero?

Suppose an object (aeroplane be better) having 1m/s² acceleration, started its journey from north pole towards south pole. Crossing south pole it reached north pole again. So, here displacement is 0 ...
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1answer
39 views

What's the speed of the train with our point of reference being the person who's moving inside the train? [closed]

A person moving in a train with the speed of 1m/s to the right, while the train is moving in the same direction with the speed of 10m/s From the person's point of view "considering that the ...
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1answer
20 views

Need help interpreting Displacement time graphs

In this image is a displacement-time graph of the movement of an iguana. Within the video (Khan academy), the explanation is that between 0 and 5 seconds, the displacement of the iguana is Xfinal-...
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10answers
918 views

Is velocity real?

This sounds like a stupid question but I am do not grasp physics concepts easily. "Velocity" is just the change in displacement over the change in time. I can see displacement and time as ...
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2answers
49 views

Determining local area change from surface displacement field

In continuum mechanics, deformed area elements are related to initial area elements by Nanson's formula: $$\vec{n}\ da = (\det{\pmb{F}})(\pmb{F}^{-T}\cdot \vec{N})dA$$ Assuming one can experimentally ...
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4answers
1k views

If displacement is 0, does that mean initial velocity equals final velocity?

For instance, one of the kinematic equations is : $$v_f^2 = v_i^2 + 2ad$$ where $v_f$ is final velocity, $v_i$ is initial velocity, $a$ is acceleration, and $d$ is displacement. Say for instance a guy ...
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1answer
27 views

How to calculate the components of the displacement of unit magnitude of an accelerating particle in 2D? [closed]

A particle is moving in 2D having a constant acceleration $ \vec a $. Given initial velocity $ \vec u $, after time $ t $ the magnitude of its displacement $ \vec S $ is 1. I need to calculate $ S_x $...
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1answer
41 views

Minimum force required to make an object slipping

Let's say we have a when and I exert some force on the center of mass of the wheel. The wheel starts rolling without slipping.At the contact point the static friction force is opposite to the force I ...
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2answers
45 views

Calculating for total distance travelled vs position given $v(t)$ graph

It is currently to my understanding that the area under a $v(t)$ graph is the displacement of an object because $$\int v(t)dt = s(t).$$ However, some of the problems I have attempted recently give you ...
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0answers
29 views

Average velocity of rocket [closed]

A rocket is accelerating straight up from the earth's surface. At $1.15$ s after liftoff, the rocket clears the top of its launch platform, $63$ m above the ground. After an additional $4.75$ s, it is ...
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2answers
67 views

Relativistic energy = four-force times displacement four-vector?

In mechanics energy is $E = \frac{m v^2}{2}$ The corresponding relativistic equation is $ E = m (\gamma -1) c^2 $ which for v<<c is appoximately $\frac{m v^2}{2}$ I know that the equation above ...
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0answers
27 views

Integral of displacement [duplicate]

Can somebody explain to me what is the integral of displacement $x$ with respect to time (if it is anything significant)? In high school physics, we are thought derivatives of $x$ which are velocity, ...
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3answers
52 views

Work=Force Displacement Displacement relative to what?

Ok, taking the equation W=FD. Say a 30N force is acting on a 10kg object over 10s, causing it to move 150 metres over a frictionless surface. The work done by this force will be 30(150)J. However, if ...
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2answers
58 views

How to find velocity and acceleration at a point given acceleration in terms of position [closed]

A particle moves along a horizontal straight line with an acceleration $𝑎=6 𝑠^{1/3} m/s^{2}$. When $t = 2 s$, its displacement $S = 27 m$ and its velocity $v = 27 m/s$. Calculate the velocity and ...
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1answer
47 views

Displacement field: Why is the polarization added and not subtracted?

I am studying the electric field $E$, polarization density $P$, and displacement field $D$, but I'm a little confused about the relation between the electric field, polarization and displacement field....
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6answers
390 views

Why is work done not equal to force times time?

I am having an issue with the definition of work. I know there are several questions already posted which seem the same as this one but the issue is that all of them either haven't been answered or ...
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2answers
89 views

Direction of velocity and displacement

Do velocity and displacement always have the same direction? I know this seems like a silly question to ask, but I'm having a hard time coming up with any counter examples, and I'm not able to prove ...
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1answer
52 views

Can you explain the direction of angular displacement?

Here the purple represents the disc, red represents the axis of rotation of the disc, and green represents the direction of rotation. It is said that by applying right hand thumb rule we can find the ...
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2answers
30 views

Is this question talking about displacement or distance travelled?

How far will a person travel in 15 min, driving their car down the highway at 24 m/s? when it says how far will a person travel, is it talking about distance or displacement?
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2answers
45 views

How to create a position-vs-time graph from this?

I'm given the following problem: At what times is the particle found at $x= 20m$? I know this is a very fundamental problem, but still I cannot see how the answer ends up being $4$ and $12$. Note ...
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0answers
16 views

Relative motions, between inertial and non-inertial frames or bodies

I had no other way to put my problem to you guys thus I am taking an example.... Here, ...
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1answer
56 views

Direction of displacement

Displacement is defined as the vector obtained by joining the final position to the initial position (head towards the final position). Well,i know this is silly but what are these final and initial ...
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1answer
14 views

Splitting a varying distance into constant acceleration and deceleration periods

I am moving a tool over a varying distance. My motors can support constant acceleration and deceleration of $1 \space m/s^2$. I need to cover the distance as quickly as possible (accelerate for as ...
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1answer
36 views

Finding displacement from acceleration and time

Can someone open my eyes my disproving the formula that I arrived. I understand it is wrong but where exactly is the mistake?
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1answer
55 views

A confusion in string connected to movable pulley

** So as we can see the pulley attached to the body here is a movable pulley.In Illustration (A) if the block attached to the pulley is moved in the direction of the arrow with an displacement of X ...
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2answers
85 views

Intuition for Sound Waves

I recently started reading about the topic "Waves" and started learning it from Transverse Waves. After building enough intuition I moved on to longitudinal waves especially sound waves. ...
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2answers
103 views

Please explain work done

We have learnt that when an force displaces object along its direction then it is work done. so there is dot product in its formula (I guess). So is it also right to say that work done is cross ...
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1answer
67 views

Is total displacement equal to the sum of hypotenuses? [closed]

The broken line represents the total displacement (i.e line from furthest vertices of the triangles, and the other dotted lines that create a triangle with the solid lines are the hypotenuses, my ...
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2answers
43 views

Kinematic displacement: why not represent higher order rates of change?

I understand that the equation for kinematic displacement is: $x = v_{0x}t+\frac{1}{2}a_xt^2$ Perhaps my understanding is naive, but it seems like this leaves out higher order rates of change. Why ...
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1answer
39 views

Why the coherent state from displacement operator and by expanding in terms of Fock state are not equal?

We can get coherent state from the formula $$|\alpha\rangle =D(\alpha)|0\rangle = \exp (\alpha a^\dagger-\alpha a)|0\rangle = \exp\left(-\frac{|\alpha |^2}{2} \right) \exp(\alpha a^\dagger) \exp(\...
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1answer
126 views

How did $4$-distance in General Relativity become displacement in Newtonian Gravity?

In general relativity the christoffel symbols 'pop' out of the metric $g^{\mu \nu} dx_\mu dx_\nu$. When $g^{\mu \nu} dx_\mu dx_\nu$ is integrated it is a measure of distance between the $2$ points. ...
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3answers
131 views

Is 1 Joule the work done to lift ~100g through a distance of 1m? [duplicate]

I am seeing many videos saying that 1 Joule is the work done to lift ~100g through a distance of 1m (like this one https://youtu.be/BYpZSdSEk4A?t=348). The idea is that 100g has a gravitational force ...
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8answers
2k views

If application of force does not result in spatial movement, has work been done? [duplicate]

I'm trying to help my kids why their elementary-school physics. Their lesson today says that "work" is done only when a change in position is accomplished by the applied force. I have absolutely no ...
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3answers
143 views

Why isn’t there a $\cos(\theta)$ in the work-energy theorem? [duplicate]

please don’t use any calculus in your answers I was reading the derivation of the work energy theorem in my textbook and it goes like this: $$W = Fs\Rightarrow W_{net} = mas$$ Since $v^2 - u^2 = 2as ...
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0answers
30 views

Question regarding displacement and volume enclosed along a fixed trajectory

Considering the motion of a particle along a fixed trajectory in which the initial displacement(fixed) is given as $X_0,Y_0,Z_0$ and the displacement at any subsequent time is given as $x(t)=f_t(X_0)$ ...
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0answers
25 views

Displacement and Pressure Wave [duplicate]

In the relation between displacement and pressure wave in sound how can there be maximum pressure when there is zero displacement of a particle,doesn't the exact opposite happen in a compression wave ...
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1answer
336 views

What is the work done if a object moves in a circular path? (Not in Circular motion)

Seem, A person is moving a object of Having mass m kg, Applying F Newton Force in A Circular path. The Radius of the Circle is r metre. What is the work done if the person starts From A point of the ...
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1answer
48 views

Definition of velocity in the context of affine space

In many texts you see the definition of velocity as the time derivative of position. In the context of affine space, position is not a vector quantity. So in the context of affine space, is the ...
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1answer
53 views

Why do some writers on EM theory call the displacement $\vec D$ a field? It's a hybrid quantity - a field ($\vec E$) plus a charge displacement vector

Gauss' equation for free space balances the number of charges in a volume with the amount of $\vec E$ field flux through the surface of the volume. When material is included in the volume, a new term ...
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2answers
109 views

How & why does the law of vector addition work? [closed]

Our teacher explained vector addition to us. He explained to us the triangle law of vector Addition. I have two questions: He said the vector $\vec{R}$ is the resultant vector, which means that ...
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4answers
3k views

If work is a scalar measurement, why do we sometimes represent it as the product of force (a vector) and distance (scalar)?

Consider an object being pushed 3/4 of the distance around a circular track. The work done on the object would be the distance of 3/4 the track’s circumference times the force applied to the object (...
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1answer
55 views

Do you know the stress-strain-temperature equations?

The case is that there are 3 layers which are bonded to adhesive joint. And there are the stress-strain-temperature equations. However I cannot understand what do these 3 equations mean. The left side ...
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1answer
85 views
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0answers
57 views

Why is the definition $\text{Work}= \text{Force}\cdot\text{Displacement}$ useful to describe the physical world? [duplicate]

Why is the definition $\text{Work}= \text{Force}\cdot\text{Displacement}$ useful to describe the physical world? Edit: Added another question as suggested by probably_someone, I think that this topic ...
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4answers
603 views

Why is work defined as $W=Fd$?

I am trying to understand what work really means in physics. I seem to be missing the conceptual link. Every resource says that $W=Fd$ but that does not make sense to me. If, say, an elastic object ...
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1answer
328 views

What does the area under an acceleration-displacement curve represent?

Considering the equation where, $$ \frac {1}{2} \left (v^2_f - v^2_i \right) = \int_0^s ads\, $$ What does the left-hand side of the equation actually represent? Is there an intuitive explanation ...
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2answers
38 views

Displacement related question

So you have two tracks of different inclines meeting at a point. Two stones are released from this point each one along the direction of one incline, from rest. Which stone reaches the ground faster? ...
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3answers
127 views

How do I calculate final velocity from acceleration, displacement and inital velocity?

How do I calculate the final velocity ($v_f$) given a known constant acceleration ($a$), a known inital and final position ($x_i$ and $x_f$), and a known inital velocity ($v_i$), where $v_i$ can be ...
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4answers
135 views

I dont understand the work equation

I don't understand how work = force * displacement as if a force of say 1 Newton was to be applied to two objects of different mass until the object reached a displacement of say 1 meter, surely the ...

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