10  COM Z$[1]
20  REM PROGRAM NAME = CENTR3, CENTRIPETAL ACCELERATION
30  REM CHAINED TO CENTRI, CENTRQ, CENTR2
40  A=1
50  IF Z$="A" THEN 210
60  PRINT '10"------SECTION 5:"'10
70  PRINT "SUPPOSE THERE IS A MASS IN UNIFORM MOTION TO THE EAST(TO THE RIGHT)."
80  PRINT "TO THE MASS IS APPLIED A PARTICULAR FORCE WHICH IS UNIFORM"
90  PRINT "IN MAGNITUDE, BUT CONTINUALLY CHANGING IN DIRECTION,"
100  ENTER 1,C2,C3
110  PRINT "SO THAT IT IS ALWAYS DIRECTED TOWARD A POINT.  "
120  ENTER 1,C2,C3
130  PRINT "WHAT IS THE RESULTING MOTION OF THE MASS?"
140  PRINT 
150  PRINT "WATCH."
160  PRINT '10"---- SIMULATED PHOTOGRAPH:"
170  PRINT TAB(11)"*"'10'10TAB(21)"*"'10'10'10'10TAB(28)"*"'10'10'10'10'10'10TAB(31)"*"'13;
180  PRINT TAB(11)"+ (THE POINT)"'10'10'10'10'10'10TAB(28)"*"'13;
190  PRINT TAB(21)'10'10'10'10"*"'13;
200  PRINT TAB(11)'10'10"*"
210  PRINT 
220  Z$="B"
230  PRINT "WHICH WORD"'1" DESCRIBES THE PATH: 1)CIRCLE, OR 2)STRAIGHT LINE?  ";
240  ENTER 200,Y,W
250  PRINT 
260  IF Y<0 THEN 230
270  IF W=1 THEN 330
280  IF W#2 THEN 230
290  PRINT '10"APPARENTLY YOU ARE LOOKING AT THE SIMULATED PHOTOGRAPH FROM "
300  PRINT "A DIFFERENT PERSPECTIVE THAN THAT INTENTED.  THE PATH LOOKS"
310  PRINT "VERY MUCH LIKE A CIRCLE FROM MY POINT OF VIEW."
320  GOTO 340
330  PRINT "     RIGHT."
340  PRINT 
350  PRINT "IN SECTION 4 WE CONCLUDED THAT THERE IS A RESULTING ACCELERATION"
360  PRINT "IN THE SAME DIRECTION AS THE APPLIED FORCE.  IF WE EXTEND THAT"
370  PRINT "CONCLUSION TO THIS SITUATION, THEN WE HAVE THAT:"
380  PRINT "   IN CIRCULAR MOTION, THERE IS AN ACCELERATION TOWARD "
390  PRINT "   THE CENTER OF THE CIRCLE."
400  END 
