# Questions tagged [work]

The product of the force on an object and the displacement the object undergoes along the direction of the force.

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1answer
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### What minimum force would you need to apply in order to do work against gravity without accelerating an object? [closed]

In this example, the object is placed on a frictionless surface. After letting go, the object travels back and forth on a U-shaped tack. Without a mass or angle to the incline, how am I supposed to ...
0answers
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### Work, power and energy in the case of chain [closed]

Please read my question carefully it is not homework question.i did my own work here I am jee advanced aspirant and i have no teacher only Google is my teacher so please don't flag my question as ...
0answers
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### Work power and energy in the case of chain [closed]

Please check my work. And my solution here. But my answer does not match with the actual answer. Where I am wrong here?
1answer
23 views

### Work done on a charge inside a homogeneous electric field and changes in Energy of the system

How to understand the concept of work using the following example: a positively charged particle (with charge $Q$) is placed in between a charged in a homogeneous electric field between the capacitor ...
1answer
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### Does work done in a capacitor in moving a charge or increasing potential difference always twice the potential energy stored?

On doing calculations like this: Work done in moving a charge across a potential difference = $(CV)V$ = $CV^2$ Potential energy increased = $(1/2)CV^2$ From this work done is twice the potential ...
5answers
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### Why do we multiply $\cos θ$ in the formula for work?

I know that the formula for work, $W = FS\cos\theta$, where $F$ is the applied force, $S$ is the displacement of the object and $\theta$ is the angle between the applied force and the displacement of ...
4answers
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### Terminal Velocity and Work

I don't know much yet about energy and work, as I've only had one lesson on it so far. However, our teacher told us that zero work is confusing and that we wouldn't need to know about it (with the ...
2answers
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### Different work needed for same momentum change in diff ref frames

The amount of work done by a force on an object at rest can be expressed as $$\frac{1}{2}m{v_0}^2$$ Where $v$ is the final velocity of the object as measured by a reference frame A Frame B is moving ...
1answer
41 views

### Is heat transfer really just work at the microscopic scale? [duplicate]

I am having trouble understanding why a division is made between heat and work. The units for energy is $\text{kg} \, \text{m}^2 \, \text{s}^{-2}$. The only way to obtain this unit is if you exert a ...
2answers
27 views

### Hyperelastic solids: why cannot the work in a closed process be negative?

While introducing the theory of hyperelastic solids, our professor gave the following example. "Suppose to have a rubber which is undeformed. Then stretch it, and then release it. The final ...
1answer
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2answers
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### Does a magnet lose mass if it’s doing work?

If a standard refrigerator magnet is used to hold up a piece of paper is it doing “work”? If so it would seem to me that energy would be required for that work and then by extension energy would be ...
3answers
178 views

### Work from a perpendicular force?

I am deeply concerned about a problem I have in past time even not noticed and slid past it without paying any attention, accepting what books write without the slightest idea that this can be a ...
3answers
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### Can internal forces do work onto object(s) in a system? [duplicate]

I know that internal forces can't do work on a system but can it do work on the bodies in a system? For example, for a ball-earth system, even though gravitational force is internal, it still did work ...
1answer
28 views

### What is the distinction between work done by torque and force about an axis other than centre of mass?

Suppose a point particle is undergoing circular motion about a fixed point such that a tangential force is accelerating its speed continuously. Now I believe that I can calculate the work done on this ...
1answer
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### Why is the Work Done indeterministic when we know $∆V=0$?

Given: In a process on a closed system in closed container, the initial pressure and volume are equal to the final pressure and volume. Comment about the Net Work Done by the System, Net Heat given to ...
2answers
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### Implications of Defining Work as Change in Mechanical Energy

Would it be possible to form a theory of physics centered around the definition of work as the change in mechanical energy of an object/system, rather than the change in kinetic energy? What are some ...
0answers
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### Can one prove the conservation of all forms of energy from Newton's laws? [duplicate]

I've learnt using the Work-Energy Theorem one can define potential energy and prove the conservation of mechanical energy. However, this only works for conservative forces while some forces in nature ...
1answer
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### Is the definition of Work done by Torque a general result?

I was going through this post. In the post the person who asked the question mentioned a statement: "Lastly, I am emphasizing that I'm am NOT saying that torque is incorrect, only that the work ...
12answers
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### Definition of a joule

I'm not getting the definition of a joule. From the definitions I've read if I apply one newton of force to any object, now matter how heavy/ how much mass it has, over one metre in a single direction ...
3answers
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### Is the $d$ in $W=F*d$ displacement or distance?

My textbooks say that work=force times displacement but when I was considering conservative and non-conservative forces I got a bit confused. I know that the work done by non-conservative forces onto ...
1answer
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### What would a force position chart look like applied in real life?

In the chart above, you can see the force (N) on the y axis and the horizontal position (m) on the x axis. How would you visualize this in your head? I'm trying to imagine the movement of a 1 kg box, ...
2answers
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### Finding frictional force of an object on a slope [closed]

Below is a question I'm trying to solve but I can't seem to get the same answer as what the solution is showing me. Is the solution wrong or is there a mistake in the way of how I think? Question: A ...
1answer
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### Finding power using work as $Fd$ or as change in energy [closed]

This is a question I had been given a few years ago and I have found two different answers depending on how I find work. If I use $W=Fd$ vs $W=E_f-E_i$, I get two separate answers. I must be missing ...
3answers
87 views

### Avoiding a confusion with dot product

Some days ago I have asked a question about a formula for power, many generous people have answered my question and clarify for me that the correct formula of work is \mathrm{d}W= \mathbf{F}\cdot \...
1answer
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### Work done for conservative forces is path independent Proof

So I’m looking at the proof for work that is path independent. There is a line were the integral Partial derivative V dr from r1 to r2 becomes Partial derivative V r’ dt from t1 to t2 I’m a bit ...
1answer
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### Does force perpendicular to velocity change its magnitude?

Of course there is the definition of work as a scalar product of $\vec F$ (force) and $\mathrm{d}\vec r$ (displacement). That would mean that if the force is perpendicular to the velocity of an object,...
2answers
49 views

### Does the $Vdp$ term in thermodynamics always imply some kind of work?

I found an answer here: What is $v \, dp$ work and when do I use it? It says that $V\,dP$ term is isentropic shaft work. Let us consider an adiabatic piston gas system which has some sand mass on top ...
1answer
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### Conceptual question about rotational and translational kinectic energy

My real life problem is to calculate initial translational and angular velocities of a vehicle in a loss of control to a stop (the vehicle will translate and rotate about it's center of mass.) Initial ...