Linked Questions

3
votes
2answers
12k views

Why can't the units of work and torque be interchanged? [duplicate]

When I'm studying about work and torque, I found that their unit are the same. But, why don't we use Joule (unit of work) instead of Newton-meter (unit of torque)? Since $\mathrm{1\ Joule = 1\ Nm}$, ...
-1
votes
3answers
821 views

Over the definition of Joule in relation to a vector quantity [duplicate]

I was thinking about the unit of measure of the Energy (as well as Heat and Work) which is Joule $$\text{J} = \frac{\text{kg}\cdot \text{m}^2}{\text{s}^2} = \text{N}\cdot \text{m}$$ But again, ...
10
votes
5answers
3k views

Units don't match in the torsional spring energy!

According to Wikipedia's description of torsion springs and according to my understanding of physics the energy of a torsional spring can be written as $$U=\frac{1}{2}k \varphi^2$$ where $k$ is a ...
6
votes
2answers
16k views

Unit of torque with radians?

Usually, the angular frequency $\omega$ is given in $\mathrm{1/s}$. I find it more consistent to give it in $\mathrm{rad/s}$. For the angular momentum $L$ is then given in $\mathrm{rad \cdot kg \cdot ...
1
vote
4answers
2k views

Reconciling Units in Classical System Analogies: Why Does Torque Have Units of Energy?

In classical physics we often cast an analogy between translational and rotational systems Force < > Torque Energy < > Rotational Energy Momentum < > Angular Momentum and considering SI ...
0
votes
3answers
357 views

What is an intuitive explanation of units like $N \cdot m$? [duplicate]

Every quantity in Physics has a unit. These units can be in 3 forms: A single unit. An example is kg or m or J A division of two or more units. An example is $\frac{m}{s}$ or $\frac{m}{s^2}$ A ...
3
votes
2answers
318 views

Wasted energy applying a torque

In another question I asked how find a way to deduce wasted energy, but I did not get a satisfactory answer. I have changed the setting here which brings us more close to the solution. Instead of a ...
0
votes
5answers
264 views

The nature of torque as a vector

I can’t comprehend torque’s role properly: What is torque’s nature? Is it some kind of energy? Because its unit is (N.m) and (N.m) is similar to (Joules) and it's energy unit. As we all know “Torque” ...
0
votes
1answer
69 views

What do we mean, concretely, by the unit $\rm N\:m$ (newton $\cdot$ meter)? [duplicate]

What do we mean, concretely, by the unit $\rm N\:m$ (newton $\cdot$ meter)? For example, $1 \:\rm m/s$ mean that each second, we make one meter. Also, $1\:\rm m/s^2$ mean that each second the speed ...
0
votes
1answer
68 views

Thermodynamics of the Earth’s core

Wikipedia presents conflicting data in the article “Tidal Acceleration”. Hopefully one of you experts can clarify this. The torque on the Earth is measured at $3.9 \cdot 10^{16}$ yet the tidal ...