Linked Questions

33 votes
11 answers
9k views

Why does work depend on distance?

So the formula for work is$$ \left[\text{work}\right] ~=~ \left[\text{force}\right] \, \times \, \left[\text{distance}\right] \,. $$ I'm trying to get an understanding of how this represents energy. ...
Dominic Roy-Stang's user avatar
17 votes
12 answers
4k views

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 ...
Zebrafish's user avatar
  • 281
28 votes
4 answers
4k views

How is the work done to push a planet over 1m with 1N the same as pushing a feather over 1m with 1N? [duplicate]

Assume there are no other forces acting and the rocket+fuel described do not weigh anything. Also, by rocket I mean engine/thruster, not space shuttle. Suppose you have a planet, say of mass 1,000,...
Dedados's user avatar
  • 463
23 votes
5 answers
39k views

Why does work equal force times distance? [duplicate]

My book says: Energy is the capacity to do work and work is the product of net force and the 1-dimensional distance it made a body travel while constantly affecting it. This seems quite ...
Noein's user avatar
  • 513
5 votes
7 answers
16k views

In calculating work done by a constant force over a constant distance, why doesn't the subject's initial velocity matter? [duplicate]

Assume a point-mass $m$ is travelling in a straight line, and a force $F$ will act on $m$ (in the same direction as $m$'s velocity) over a constant distance $d$; why doesn't $m$'s velocity matter to ...
BlueBomber's user avatar
15 votes
2 answers
2k views

Why is work done defined the way it is? What's the intuition here? [duplicate]

I have a question I am struggling with for days. So, Work transfers energy from one place to another or one form to another. (at least as per Wikipedia) Imagine 2 scenarios. Scenario 1: A pen on ...
Sushant Gupta's user avatar
0 votes
2 answers
759 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 ...
Luo Zeyuan's user avatar
0 votes
4 answers
578 views

Why is Work equal to Force * distance? [duplicate]

I totally get the mathematical part, but I cannot imagine how this works. I apply a force to a ball. Why does the distance over which it moves matter to me? Sure, if I calculate the kinetic Energy of ...
DottyPhone's user avatar
2 votes
3 answers
110 views

Does a force have to be maintained during a distance to do work? [duplicate]

Suppose I kick a ball horizontally with force $F$ and the distance traveled during impact is $d$. The ball then travels distance $d' = d + 10 \mathrm{m}$ before stopping. Is the work done $W = Fd$ ...
emanon's user avatar
  • 35
2 votes
8 answers
4k 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 ...
Ritanshu's user avatar
  • 493
3 votes
3 answers
621 views

Why is energy calculated with respect to distance and not time? [duplicate]

Okay, so looking at the basic definition of energy the force is summed over the distance it is applied. Why exactly is it taken over the distance applied and not the time applied? I understand that ...
J. LeMoine's user avatar