All Questions
14
questions
-1
votes
2
answers
99
views
Motivation for definition of work [closed]
Why do we take the dot product in the work energy theorem? Consider the integral
$$\int\vert\vec F\vert\vert d\vec r\vert$$
Why don't we define this to be work done for example, instead of $\int\vec F\...
0
votes
1
answer
76
views
${}$Conservative and Non-Conservative Forces
For work done by conservative forces ($W = F.S$), we consider $S$ as the displacement and not the actual path travelled. However for non conservative forces we consider the total path length and not ...
0
votes
1
answer
635
views
Formula for work done for both conservative and non-conservative force are different?
We know that the formula for Work Done by an constant force is
W.D = Force x displacement x (cosine of angle between force and displacement).
Situation: A mass m travels 10 meters towards +ve axis ...
- 1
1
vote
3
answers
112
views
Clarification on the displacement in the definition of Work
I'd like to ask a question about work. The definition of work gives us a way to calculate the work done by a force along a path but in practice it's not always clear what path to take in consideration....
- 410
-3
votes
2
answers
231
views
Why is work done force times displacement? [duplicate]
Why is work done the product of force and displacement? Why not force and time?
- 13
0
votes
4
answers
3k
views
Why do we multiply $\cos θ$ in the formula for work? [duplicate]
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 ...
1
vote
3
answers
308
views
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 ...
1
vote
3
answers
222
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 ...
- 11
-1
votes
2
answers
351
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 ...
3
votes
9
answers
4k
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 ...
- 1,033
0
votes
2
answers
720
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 ...
- 892
8
votes
3
answers
1k
views
What does the 'displacement' refer to in the definition of work?
The definition of work given in books is The work is said to be done by a force on a body, when the body is moved by the force through some 'displacement'.
Now let a body of mass $m$ at rest. When a ...
- 706
1
vote
3
answers
2k
views
What is the "displacement" of the object in the definition of work?
Work in physics is mathematically defined as force $F$ applied on an object multiplied by the displacement $d$ it covers in the direction of the force. In a system where, a restrictive force exists ...
- 13
10
votes
4
answers
2k
views
Does the displacement in the definition of work correspond to the displacement of the object or the point of application of the force?
Work is defined as
$$W = \vec{F}\cdot\vec{s}$$
But what what exactly is $\vec{s}$? Is it the displacement of the body on which the force is being applied? Or is it the displacement of the point of ...
- 2,770