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Results tagged with rotational-dynamics
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user 62456
A tag for questions about the mechanical interactions of rotating objects, including torque and angular momentum.
2
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0
answers
513
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Friction and work from torque
I would like to understand where is the error in the third case, for that I gave 2 easier cases where I'm able to find the energy from heating is equal to the energy lost by torque.
Case 1/ Purple di …
- 185
7
votes
1
answer
521
views
Sum of energy for 2 solids in rotation
I would like to compute the sum of energy of the following case:
Two solids are turning (disks). Yellow solid is turning at $w_1$ radians per second around its center of gravity and blue solid is …
- 185
2
votes
0
answers
244
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Sum of energy from torques of several disks in double rotation [closed]
Here the study:
An external system (not drawn) give energy for rotate disks around themselves and around green axis. All disks have energy at start, at $t=0$ friction is ON and at $t=0$ external syst …
- 185
0
votes
1
answer
352
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What prevents this rotational perpetuum mobile from working? [closed]
As a newbie in physics I imagine this device and I would like to know why it can't increase its energy.
Note I study the sum of energy during one second (or less) after set friction ON.
The device:
…
- 185
2
votes
Is this expression for the kinetic energy of a spinning disk revolving about a second axis c...
For a ring:
$Ke = \frac{1}{2}m ( \int_0^{2\pi} (Rw_1-rw_1cos(\theta)+rw_2cos(\theta))² +(rw_2abs(sin(\theta))² d\theta) $
$Ke = \frac{1}{2}m \int_0^{2\pi} R²w_1²+r²w_1²cos²(\theta)+r²w_2²cos²(\the …
- 185