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Re: How does Velocity work?

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1waffle1 is not online. 1waffle1
Joined: 16 Oct 2007
Total Posts: 16381
21 Oct 2012 05:47 PM
I've really never gotten it. Say I want to move a 1x1x1 brick away from me. I give it velocity in the opposite direction.
If I want to move a larger brick, I simply multiply the applied velocity by the mass of the brick.
The larger brick goes flying exponentially farther than the smaller brick.

So I decide not to multiply the applied velocity by the mass.
The 1x1x1 brick moves the same distance.
The larger brick does not move.

How does this work?
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TaslemGuy is not online. TaslemGuy
Joined: 10 Jun 2009
Total Posts: 12174
21 Oct 2012 05:49 PM
Probably has to do with friction. You need to be more specific or we can't help.
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1waffle1 is not online. 1waffle1
Joined: 16 Oct 2007
Total Posts: 16381
21 Oct 2012 05:54 PM
Happy 12000th post.

So it has to do with friction? What is the coefficient of friction on Roblox?
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noobertuber is not online. noobertuber
Joined: 16 Jan 2007
Total Posts: 2321
21 Oct 2012 06:16 PM
I believe that TalasemGuy is correct. Friction (More specifically, static friction) is responsible for the lack of movement. To demonstrate this, make two bricks, one large and one small, float (Bodyforce of (0,196.6*mass,0). Then assign equal velocities to both. They will both have moved the same distance over the same amount of time. (Give or take a bit.)
On a slightly related note, static friction should probably not apply to Roblox parts, despite the status quo. If you are merely setting the velocity to a certain amount, not applying force, than the physics engine should ignore static friction, and merely apply dynamic friction.

-God Bless-
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1waffle1 is not online. 1waffle1
Joined: 16 Oct 2007
Total Posts: 16381
21 Oct 2012 06:19 PM
Stop saying "merely."
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noobertuber is not online. noobertuber
Joined: 16 Jan 2007
Total Posts: 2321
21 Oct 2012 06:26 PM
I mer-ONLY said it twice.

-God Bless-
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JulienDethurens is not online. JulienDethurens
Joined: 11 Jun 2009
Total Posts: 11046
21 Oct 2012 06:34 PM
"How does Velocity work?"

> implying Velocity works
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MissNicNac is not online. MissNicNac
Joined: 11 May 2011
Total Posts: 3
21 Oct 2012 06:45 PM
Julien wins the thread.
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noobertuber is not online. noobertuber
Joined: 16 Jan 2007
Total Posts: 2321
21 Oct 2012 07:23 PM
Velocity works quite well as a read-only value.

-God Bless-
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MasterDesigner is not online. MasterDesigner
Joined: 07 Mar 2010
Total Posts: 3915
21 Oct 2012 08:22 PM
Really only effective with its best friends BodyForce and BodyGyro.
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1waffle1 is not online. 1waffle1
Joined: 16 Oct 2007
Total Posts: 16381
21 Oct 2012 08:37 PM
@master do not want with hundreds of bricks
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Merely is not online. Merely
Joined: 07 Dec 2010
Total Posts: 17266
21 Oct 2012 08:40 PM
you guys talking about me?
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JulienDethurens is not online. JulienDethurens
Joined: 11 Jun 2009
Total Posts: 11046
21 Oct 2012 09:07 PM
@Merely

Why would we talk about you? You're merely Merely.
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awsumpwner27 is not online. awsumpwner27
Joined: 03 Sep 2011
Total Posts: 4389
21 Oct 2012 11:14 PM
F = ma

I see no velocity here.
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awsumpwner27 is not online. awsumpwner27
Joined: 03 Sep 2011
Total Posts: 4389
21 Oct 2012 11:24 PM
"How does Velocity work?"
"Velocity work?"
"work"

v = d/t

I see no joules.
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Tonitoni is not online. Tonitoni
Joined: 14 Mar 2009
Total Posts: 6429
22 Oct 2012 02:06 AM
Reading scripting forums amuses me,
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Prehistoricman is not online. Prehistoricman
Joined: 20 Sep 2008
Total Posts: 12490
22 Oct 2012 02:08 AM
I never understand how force = mass x acceleration.

If I push a wall. That wall is not moving. I am still applying force.

NEWTON IS WRONG.
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nate890 is not online. nate890
Joined: 22 Nov 2008
Total Posts: 21686
22 Oct 2012 03:12 AM
Assuming that the friction theory is correct, play with the Friction property of BasePart and see what happens... :o
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Garnished is not online. Garnished
Joined: 09 Apr 2012
Total Posts: 12695
22 Oct 2012 10:34 AM
simple description

if u haz velocity on 0, you dunt moove
if u change it to -6 you move backwards
if u change it to 6 you move forward
it's basically the friction power
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HotThoth is not online. HotThoth
Forum Moderator
Joined: 24 Aug 2010
Total Posts: 1176
22 Oct 2012 12:12 PM
@Prehistoric: that's because the wall pushes back :P.
@Others: You need more force to push a bigger block, but not more velocity. Velocity is just speed in a particular direction, so when you set that, the size of the part doesn't matter. Floating the two parts (or just CFraming them up in the air by a few studs when you set their velocities) will show you that this is indeed the case.

- HotThoth
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kingkiller1000 is not online. kingkiller1000
Joined: 12 Dec 2008
Total Posts: 26415
22 Oct 2012 05:31 PM
Well, *technically* Newton IS wrong. F = MA gives a very accurate approximation, but isn't totally accurate.
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Quenty is not online. Quenty
Joined: 03 Sep 2009
Total Posts: 9316
22 Oct 2012 05:37 PM
Let's talk about quantum physics.

If you have a button 1 light year away, and a 1 light year long board, and you push the board so it pushes the button, how long will it take until the button is pushed?

Diagram.

______________________________________________________________
(A)                                                                                                     (B)

A = You
B = Button

AB = 1 light year

xD
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awsumpwner27 is not online. awsumpwner27
Joined: 03 Sep 2011
Total Posts: 4389
22 Oct 2012 08:08 PM
Bro.

I will assume that the board is made of steel.

I am also assuming that this has to do with how fast a sound wave can travel through a material.

I looked up the length of a light year in kilometres and converted that to metres.

9.4605284e15 m

Then I looked for how fast sound travels through steel, and used the highest speed provided.

6100 m/s

I assume it has to do with sound because sound is like pushing. This is similar to what's described in the problem.

I use the ol' v = d/t and make it t = d/v.

9.4605284e15/6100 = 1.5509063e12 s

1.5509063e12 s = 49178.916 years
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lombardo2 is not online. lombardo2
Joined: 30 Nov 2008
Total Posts: 1604
22 Oct 2012 08:22 PM
^Wut?, nub problem

let's get serious, solve the three body problem
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crazyman32 is not online. crazyman32
Joined: 13 Apr 2008
Total Posts: 18027
22 Oct 2012 10:00 PM
Well, to levitate an object, you set the Y-axis MaxForce to:

MassOfModel * (236/1.2)


I use this to dynamically set the MaxForce of my aviation projects close to the mass of the plane itself to allow for a small drag effect.
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