Physics for Game Developers
By David M. Bourg

The following corrections were made to the 1/04 reprint:


Here's a key to the markup:
	[page-number]: serious technical mistake
	{page-number}: minor technical mistake
	<page-number>: important language/formatting problem
	(page-number): language change or minor formatting problem
	?page-number?: reader question or request for clarification




[19]  3-rd equation from the bottom;
The integrated expression (vector product):
(r x w x r) 

NOW READS:
(r x (w x r))


[19]  last paragraph;
"... and (w x r) is angular momentum of each elemental mass..."

NOW READS:
"... and (r x (w x r))dm  is angular momentum of each elemental mass..."



[70]  the last equation;
The equation:
sum(F) = sqrt{sum[(Fx)^2] + sum[(Fy)^2]}

NOW READS:
sum(F) = sqrt{(sum Fx)^2 + (sum Fy)^2}



{72}  4-th equation;
3 parentheses were opened but only 2 closed.

An additional closing parenthesis HAS BEEN ADDED just after the Cv variable.



{72}  7-th equation from the bottom;missing open and close brackets

The equation IS NOW in the form:
[expression substituted for v2]dt = ds



[75]  the last equation on this page was incorrect;

It NOW READS:
Sum F = SQRT[ (sum Fx)^2 + (sum Fy)^2 + (sum Fz)^2 ]


[76] last three equations at bottom:

NOW READS:
All minus signs in these equations HAVE BEEN CHANGED to plus signs.


(77)  2-nd equation fron the bottom and the last equation of this page;
2-nd eq. from the bottom:
on the right side of the equation in the expression exp[-(Cd/m)t]

The "d" portion of the exponent NOW APPEARS as a subscript.

The last eq. on this page:
- in exp[-(Cd/m)t] the "d" portion of the exponent NOW APPEARS as a subscript.
- cw portion of the equation (two instances) NOW APPEARS as Cw (C is now uppercase).


(77)  4-th equation from the bottom;
In this equation:
Cd, Cw, vw, vx1, vx2
symbols:
d, w, x1 and x2 NOW APPEAR as indexes (smaller letters lower than the main line of text).
In x1 and x2 numbers 1 and 2 NOW APPEAR as subindexes.



(77)  5-th equation from the bottom;
The left side of the equation:
(Cd/m)t=....

The "d" portion of the exponent NOW APPEARS as a subscript.


{78}  2-nd and 3-rd eq. and some other eq. on this page;
In all occurrences of the exp[(-Cd/m)t] on this page, The "d" portion of the exponent
NOW APPEARS as a subscript.


{79}  3-rd line from the bottom;
A minus "-" HAS BEEN ADDED at the end of this line.


[80]  3rd line from the top;
A minus "-" HAS BEEN ADDED at the end of this line.


[83]  4-th equation;
The equation was incorrect.

It NOW READS:
Sum F = SQRT[ (sum Fx)^2 + (sum Fy)^2 ]


(86)  5-th equation;
"Ic" 

NOW READS:
"Icg"



{92}  2-nd equation from the top;
i and j are both vectors and NOW APPEAR in the vector style (bold letters, no italics).


{92}  2-nd equation from the top;
The value (0.864) NOW READS (0.866)


{93}  1-st, 2-nd and 3-rd equation;
v1+ and v2+ are vectors, and NOW APPEAR in vector style (bold letters, no italics).



{94}  6-th and 7-th equation;
v1- and v2- are vectors, and NOW APPEAR in vector style (bold letters, no italics).


(111)  Last sentence of 3rd paragraph:
"In the SI system you'll get R_t in newtons (N) if you have velocity in m/s, area in
m, and..."

"area in m," NOW READS "area in m2,"



[115]  last display equation on the page;
F_L = 2\pi^2 \rho r^4 v \omega


NOW READS:
F_L = 2\pi \rho r^4 v \omega



(196) 3rd line of 1st paragraph under the code:
"Similarly, STBCThruster...."

NOW READS:
"Similarly, STBDThruster...."