Re: Movement with speed dependent friction problem
- From: Mark Nudelman <markn@xxxxxxxxxxxxxxxxxxxxx>
- Date: Thu, 05 Apr 2007 18:57:08 -0700
On 4/5/2007 6:45 PM, awsim wrote:
Not being a math guru I need a little help with what seem to you a
simple problem
Here is description of my problem. An object is moving in a straight
line. The object can thrust to speed up and thrust in reverse to
slowdown.
The object is traveling between two known points, A & B, distance d
apart.
+----------------------+
A d B
The basic movement is as follows
Ft = thrust
A = acceleration
Vi = Initial velocity
Vf = final velocity
Cf = friction constant
Ff = friction force
F = force on object
so...
Ff = - Vi * Cf
F = Ft + Ff = Ft - Vi * Cf
A = F / Mass
Vf = Vi + A * timeStep
My question is :
If I know my initial velocity, distance left to go and final velocity,
how do I calculate the thrust ?
Did you really mean Ff = - Vi * Cf? It seems more likely that the
friction at any point in time would be proportional to the velocity at
that point in time, not to the initial velocity.
--Mark
.
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