Questions tagged [displacement]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
1
vote
1answer
41 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 ...
1
vote
2answers
60 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 ...
12
votes
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 (...
0
votes
0answers
27 views

Relationship between frequency domain and time domain of electric displacement field

Given that the relationship between the displacement field and electric field in frequency domain is: $\tilde{D}(\omega,\vec{x}) = \epsilon (\omega) \tilde{E}(\omega,\vec{x})$ where: $\epsilon (\...
0
votes
1answer
44 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 ...
0
votes
1answer
62 views
0
votes
0answers
50 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 ...
1
vote
4answers
208 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 ...
0
votes
1answer
61 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 ...
0
votes
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? ...
1
vote
3answers
58 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 ...
2
votes
4answers
100 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 ...
1
vote
1answer
88 views

Why is it important that there is no variation of time $\delta t=0$ in the definition of virtual displacement?

In Goldstein's Classical mechanics I found a proposition that I don't understand: Similarly, the arbitrary virtual displacement $\delta \mathbf{r}_i$ can be connected with the virtual displacement $...
1
vote
0answers
39 views

Why does integrability imply compatibility?

In mechanics, we have the so called compatibility conditions, which quarantee that when a body deforms, the strains are "compatible" in such a way to no discontinuities or gaps for inside the body as ...
0
votes
0answers
46 views

Displacement Vector

I am trying to understand how multiple dimensions will affect displacement. I'm given the initial velocity: $-2.5\frac{m}{s}\hat{\textbf{i}}$. The acceleration is: $3.5\frac{m}{s^2}\hat{\textbf{i}}...
0
votes
1answer
153 views

What is infinitesimal displacement? [duplicate]

This section is from the Openstax University Physics: Volume 1 online textbook. In physics, work is done on an object when energy is transferred to the object. In other words, work is done when a ...
1
vote
2answers
90 views

Difference between displacement-time graph and position-time graph

While going through my physics book, I got over a question which ask us to plot a position-time graph for the interval ($t=0\,\mathrm s$ to $t=5\,\mathrm s$) From the top of a tower, a ball is ...
0
votes
7answers
198 views

Why is work equal to force times displacement?

This is how I think of what work is.I am sure I am wrong somewhere because I shouldn't be coming to the conclusion that I am coming to.It would be helpful if you would point out where this conceptual ...
0
votes
2answers
57 views

Area under a velocity graph

If I took the definite integral of a velocity graph from 0 to 10 seconds, the answer would be the change in position over those 10 seconds correct? I am told by my teacher the area is change in ...
0
votes
0answers
27 views

Name for the set Displacement, Velocity, Acceleration, etc

Is there a name for the set Displacement, Velocity, Acceleration, Jerk, etc? The only name I can think of is 'Derivatives of displacement (wrt time)' which is rather long.
1
vote
2answers
49 views

What is the use of Subtracting velocity?

By adding two velocity's direction we get the direction the object has travelled. But what do we get when we subtract vectors?
0
votes
1answer
52 views

Why does a force displace matter?

Why does a force displace matter? Is the fact that a force displaces matter purely empirically or do we have a better explanation?
7
votes
7answers
1k views

What is the difference between position, displacement, and distance traveled?

Suppose the question is somewhat like this: If $v=8-4t$ and the position at time $t= 0\ \rm s$ is $2\ \rm m$, find the distance traveled, displacement, and final position at $t=3\...
1
vote
4answers
120 views

Does a helicopter hovering over an ocean displace its weight in water?

Suppose an amphibious helicopter is floating on the water. Like any floating object, it displaces its weight in water. Then it starts engine, takes off, and begins hovering at a very low altitude ...
2
votes
4answers
35 views

Is work equal to area between graph and $x$-axis in a graph of force vs displacement?

Is this true even when displacement is not in direction of force? $$W = \int (F\cos\theta)\text dx$$ and area is $\int F \text dx$. In my book that area is given as one of the definitions ...
-5
votes
3answers
103 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 ...
0
votes
0answers
33 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, ...
1
vote
2answers
114 views

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 ...
0
votes
4answers
699 views

What does a negative acceleration mean? Is the object slowing down, changing direction, or both?

I am confused about such things as negative velocity, acceleration, and displacement and what the negative indicates.
1
vote
0answers
344 views

Phase difference between displacement wave and pressure wave in longitudinal waves

As the Mathematical treatment yields, the pressure wave leads the displacement wave by $\frac{\pi}{2}$. But I want to ask why is it so? According to me, supposing if the displacement wave is a sine ...
0
votes
2answers
363 views

Why is work done a dot product of force and distance?

Suppose force is applied on an object at an angle theta and the block moves for some distance along x axis I understand that we take x component of ...
0
votes
2answers
452 views

Can displacement be negative after calculation?

Regardless of the positive or negative, doesn't the number determine the total displacement and not the sign in front of the numbers?
0
votes
1answer
213 views

Are there any formulas that calculate the stopping distance of a car on different surfaces that include deceleration?

I already found the formula $d = v^2/2\mu g$ where '$v$' is for velocity, '$\mu$' is for the coefficient of friction between the tires and the road surface, and '$g$' is the acceleration of gravity. ...
-1
votes
3answers
100 views

What makes displacement a vector?

Displacements are vectors because they add like vectors is the answer. It is also an experimental fact. Though rotations are displacements but not vectors. Is there any more fundamental or intuitive ...
0
votes
1answer
36 views

Conceptual explanation: Finding revolutions over a given time interval

The following question from NJCTL was assigned for me as homework. It is not a heavy computational problem, but rather, a conceptual one. I reviewed the meta guide regarding these types of questions ...
0
votes
1answer
65 views

In the equation for acceleration (with known $v$, $u$ and $s$) why velocity is squared and displacement is multiplied by 2? [closed]

In the following equation $$a = \frac{v^2 − u^2 } {2s} ,$$ where $v$ is the final velocity, $u$ is the initial velocity, and $s$ is displacement. Why is velocity squared and displacement multiplied by ...
0
votes
2answers
289 views

Confusion on Horizontal & Vertical Components of a Parabolic Motion

This was a question I found about projectile motion, the question was what's the bike's speed when it took off. Using $S=ut + 0.5at^2$, the time taken to reach the ground is $0.505 s$, they used ...
0
votes
0answers
55 views

Acceleration as the second derivative of displacement function

Let $x$ be displacement as a function of time $t$ and some other physical quantity $k$ such that $ x = f(t,k) $ Now, 1) Will the acceleration $a$ be $\frac{\partial^2 x}{\partial t^2}$ or $\frac{d^...
0
votes
2answers
52 views

What's the relation between acceleration, position and angular velocity?

I just encountered a problem involving lift and oscillations where I found the following differential equation: $$\ddot y = -\frac{ \rho gA}{m}y = -\omega^2 y$$ What's the relation between $\ddot y$, ...
2
votes
4answers
219 views

Different expressions for distance & displacement : $\int$$d$$|\vec r|$, $\int$$|$$d$$\vec r$|, and $|$$\int$$d$$\vec r|$

I came across these expressions in my book. And the book says that all these are different from each other. The expressions are : $\int$$d$$|\vec r|$, $\int$$|$$d$$\vec r$|, and $|$$\int$$d$$\vec r|$ ...
0
votes
1answer
36 views

Representing a wave

I don't know how relevant is asking this but We know that we represent waves by displacement, velocity etc.What about area vectors? I mean what about representing a wave by area vectors or even volume?...
-1
votes
2answers
86 views

Why is work defined with respect to distance rather than time? [duplicate]

The common way of finding the work done on some object is by applying the equation: force*displacement. However, suppose we apply a force of F newtons on an object of mass M for a duration of T ...
0
votes
1answer
1k views

How to know what the area under curve represents?

Is there a way to find out what the area under the curve represents? For eg. If i gave you a graph of $v$ with respect to $t$ would you be able to tell me what the area under the curve represents ...
-1
votes
3answers
430 views

Hooke's Law: Is the extension of a spring the same as its displacement?

This question might make no sense, but I'd like to ask it anyway. The elastic potential energy of a spring is the area under the force-extension/compression graph. The work done on a spring is ...
1
vote
2answers
114 views

How to study the work done by a varying force on a system moving in two dimensions?

My book states that: $$W=\int_{x_i}^{x_f}{F_x dx}$$ We can calculate the area under the curve representing force as a function of position when the displacement and the force are in one direction ...
3
votes
2answers
210 views

Does Euler number $e$ have a role in kinematics?

Euler number $e$ is often explained with the example of compound continuous interest. I was wondering if it could also be illustrated with an example about the displacement of a body (although not an ...
3
votes
2answers
95 views

Why work definition involves displacement?

$$W=\left\Vert\vec{F}\right\Vert \left\Vert\Delta\vec{r}\right\Vert \cos{\theta}$$ A greater magnitude force will have a greater influence than a smaller magnitude one when they have the same $\theta \...
0
votes
1answer
156 views

Relation between strain and velocity

The strain tensor writes $\epsilon_{ij}=\frac{1}{2}\Big(\frac{\partial u_i}{\partial x_j}+\frac{\partial u_i}{\partial x_j}\Big)$ with $u_i$ the displacement in the $i$ direction. Then $\frac{\...
0
votes
1answer
388 views

Strain gauge vs linear variable displacement transducer

For measuring deformation experiments, it seems that strain gauges and linear variable displacement transducers (LVDT) are commonly used. If the material exhibits geometric linearity, then couldn't we ...
3
votes
1answer
352 views

I need to find the drag coefficient of a pendulum bob [closed]

Is it possible to find the drag coefficient of a pendulum bob from the damping caused on it during swinging. I will be able to measure its displacement from the point of origin and plot it against ...