v50 Steam/Premium information for editors
- v50 information can now be added to pages in the main namespace. v0.47 information can still be found in the DF2014 namespace. See here for more details on the new versioning policy.
- Use this page to report any issues related to the migration.
This notice may be cached—the current version can be found here.
Editing v0.34 Talk:Minecart
Jump to navigation
Jump to search
Warning: You are not logged in.
Your IP address will be recorded in this page's edit history.
You are editing a page for an older version of Dwarf Fortress ("Main" is the current version, not "v0.34"). Please make sure you intend to do this. If you are here by mistake, see the current page instead.
The edit can be undone. Please check the comparison below to verify that this is what you want to do, and then save the changes below to finish undoing the edit.
| Latest revision | Your text | ||
| Line 66: | Line 66: | ||
:::Actually, this is an interesting result of (real-world) physics. Gravitational potential energy is mass * gravity * height, while kinetic energy is 1/2 * mass * velocity<sup>2</sup>. When you set these two formulas equal the mass terms cancel out. That means that two objects that start at the same height (and velocity) will have the same final velocity after rolling down the same hill (ignoring all other forces like wind resistance). I don't know how detailed the game's modeling of this is, but your result is mostly expected (though it does imply that rollers apply a "constant velocity" to minecarts). To find out if mass is being modeled correctly you can transfer the energy to something else. For instance, if you place a [[dog]] on the tracks at the bottom of the hill, the loaded platinum minecart should hit the dog and continue on at roughly the same speed. The featherwood minecart may hit the dog and stop completely, having insufficient energy left to continue moving. Or they may both do the same thing, strongly implying that mass is not being modeled. --[[User:Loci|Loci]] 20:27, 26 February 2013 (UTC) | :::Actually, this is an interesting result of (real-world) physics. Gravitational potential energy is mass * gravity * height, while kinetic energy is 1/2 * mass * velocity<sup>2</sup>. When you set these two formulas equal the mass terms cancel out. That means that two objects that start at the same height (and velocity) will have the same final velocity after rolling down the same hill (ignoring all other forces like wind resistance). I don't know how detailed the game's modeling of this is, but your result is mostly expected (though it does imply that rollers apply a "constant velocity" to minecarts). To find out if mass is being modeled correctly you can transfer the energy to something else. For instance, if you place a [[dog]] on the tracks at the bottom of the hill, the loaded platinum minecart should hit the dog and continue on at roughly the same speed. The featherwood minecart may hit the dog and stop completely, having insufficient energy left to continue moving. Or they may both do the same thing, strongly implying that mass is not being modeled. --[[User:Loci|Loci]] 20:27, 26 February 2013 (UTC) | ||
| − | ::::Ah, thanks for the refresher course. The thing is i didn't use a slope for pushing test. Then again that doesn't really matter since deceleration is not dependent on mass. Friction, as the only force affecting the minecart (since normal force and | + | ::::Ah, thanks for the refresher course. The thing is i didn't use a slope for pushing test. Then again that doesn't really matter since deceleration is not dependent on mass. Friction, as the only force affecting the minecart (since normal force and gravitation cancel each out on horizontal surface), is mass * deceleration and equals to friction coefficient * normal force (mass * gravity) ('''F<sub>F</sub> = a*m = µ<sub>k</sub>*N = µ<sub>k</sub>*m*g''' => '''a = µ<sub>k</sub>*g''') |
::::So rather than affecting their speed/deceleration it should affect initial velocity. --[[User:HYBRID BEING|HYBRID BEING]] 09:37, 27 February 2013 (UTC) | ::::So rather than affecting their speed/deceleration it should affect initial velocity. --[[User:HYBRID BEING|HYBRID BEING]] 09:37, 27 February 2013 (UTC) | ||
:::::I filed this as a {{bug|6296}}. I'll add this bug to the article later if no problem would arise. --[[User:HYBRID BEING|HYBRID BEING]] 05:45, 28 February 2013 (UTC) | :::::I filed this as a {{bug|6296}}. I'll add this bug to the article later if no problem would arise. --[[User:HYBRID BEING|HYBRID BEING]] 05:45, 28 February 2013 (UTC) | ||