Robotics Worksheet: Debugging Robot Programs

Robotics lesson 26: Debugging robot programs · Set 20 · 40 questions

Robot tip (Compare and fix one thing): Run it, spot what went wrong, find the buggy line, fix one thing, test again. Wrong side → a turn is the wrong way. Too far or too short → a forward number is wrong. A shape that does not close → the turn should be 360 ÷ sides; a gap → the repeat number should equal the sides.

1. 1.🐞 A robot starts at (4, 2) facing north (the second number counts squares up, the first counts squares across to the east). It should stop on the star at (2, 8). Its program:
   1. forward 7
   2. turn left
   3. forward 2
   It stops at (2, 9) instead. Which line has the bug? (a) line 2 (b) line 1 (c) line 3
2. 2.🐞 This program should draw a regular pentagon (5 equal sides), but it leaves a gap:
   repeat 2 { forward 10 cm; turn right 72° }
   What should the number 2 after “repeat” be?
3. 3.🐞 A robot starts at (4, 1) facing north (the second number counts squares up, the first counts squares across to the east). It should stop on the star at (7, 3). Its program:
   1. forward 2
   2. turn left
   3. forward 3
   It stops at (1, 3) instead. Which line has the bug? (a) line 3 (b) line 1 (c) line 2
4. 4.🐞 This program should draw a regular triangle (3 equal sides), but the shape does not close:
   repeat 3 { forward 10 cm; turn right 60° }
   What should 60 be changed to?
5. 5.🐞 Why change only one thing at a time when debugging? (a) to save paper (b) to confuse others (c) to see what fixed it (d) to make it slower
6. 6.🔢 To debug a robot program, which comes first: “run the program” or “spot what went wrong”? (a) run the program (b) spot what went wrong
7. 7.🐞 A robot starts at (5, 2) facing north (the second number counts squares up, the first counts squares across to the east). It should stop on the star at (2, 7). Its program:
   1. forward 5
   2. turn right
   3. forward 3
   It stops at (8, 7) instead. Which line has the bug? (a) line 2 (b) line 3 (c) line 1
8. 8.🐞 This program should draw a regular triangle (3 equal sides), but it leaves a gap:
   repeat 2 { forward 10 cm; turn right 120° }
   What should the number 2 after “repeat” be?
9. 9.🐞 A robot starts at (4, 0) facing north (the second number counts squares up, the first counts squares across to the east). It should stop on the star at (3, 3). Its program:
   1. forward 4
   2. turn left
   3. forward 1
   It stops at (3, 4) instead. Which line has the bug? (a) line 3 (b) line 2 (c) line 1
10. 10.🐞 A robot starts at (5, 2) facing north (the second number counts squares up, the first counts squares across to the east). It should stop on the star at (4, 5). Its program:
    1. forward 4
    2. turn left
    3. forward 1
    It stops at (4, 6) instead. Which line has the bug? (a) line 2 (b) line 3 (c) line 1
11. 11.🐞 This program should draw a regular octagon (8 equal sides), but it leaves a gap:
    repeat 5 { forward 10 cm; turn right 45° }
    What should the number 5 after “repeat” be?
12. 12.🐞 A robot starts at (4, 0) facing north (the second number counts squares up, the first counts squares across to the east). It should stop on the star at (6, 6). Its program:
    1. forward 6
    2. turn right
    3. forward 3
    It stops at (7, 6) instead. Which line has the bug? (a) line 2 (b) line 3 (c) line 1
13. 13.🐞 A mistake in a program is called a … (a) sensor (b) loop (c) gear (d) bug
14. 14.🐞 A robot starts at (5, 0) facing north (the second number counts squares up, the first counts squares across to the east). It should stop on the star at (4, 6). Its program:
    1. forward 7
    2. turn left
    3. forward 1
    It stops at (4, 7) instead. Which line has the bug? (a) line 2 (b) line 3 (c) line 1
15. 15.🐞 A robot starts at (5, 1) facing north (the second number counts squares up, the first counts squares across to the east). It should stop on the star at (8, 4). Its program:
    1. forward 3
    2. turn left
    3. forward 3
    It stops at (2, 4) instead. Which line has the bug? (a) line 1 (b) line 3 (c) line 2
16. 16.🐞 A robot turns the wrong way at every corner. What is the likely bug? (a) the floor is clean (b) battery is too new (c) wheels are too round (d) left and right mixed up
17. 17.🐞 A robot starts at (4, 2) facing north (the second number counts squares up, the first counts squares across to the east). It should stop on the star at (1, 7). Its program:
    1. forward 5
    2. turn right
    3. forward 3
    It stops at (7, 7) instead. Which line has the bug? (a) line 2 (b) line 3 (c) line 1
18. 18.🐞 A robot starts at (4, 0) facing north (the second number counts squares up, the first counts squares across to the east). It should stop on the star at (3, 4). Its program:
    1. forward 4
    2. turn left
    3. forward 2
    It stops at (2, 4) instead. Which line has the bug? (a) line 2 (b) line 3 (c) line 1
19. 19.🔢 To debug a robot program, which is the FIRST step? (a) test it again (b) fix one thing (c) run the program (d) find the buggy line
20. 20.🔢 To debug a robot program, what comes right after “run the program”? (a) find the buggy line (b) test it again (c) spot what went wrong (d) fix one thing
21. 21.🐞 A robot starts at (4, 1) facing north (the second number counts squares up, the first counts squares across to the east). It should stop on the star at (2, 4). Its program:
    1. forward 2
    2. turn left
    3. forward 2
    It stops at (2, 3) instead. Which line has the bug? (a) line 3 (b) line 2 (c) line 1
22. 22.🐞 This program should draw a regular pentagon (5 equal sides), but the shape does not close:
    repeat 5 { forward 10 cm; turn right 120° }
    What should 120 be changed to?
23. 23.🐞 A robot starts at (4, 0) facing north (the second number counts squares up, the first counts squares across to the east). It should stop on the star at (6, 5). Its program:
    1. forward 5
    2. turn right
    3. forward 1
    It stops at (5, 5) instead. Which line has the bug? (a) line 2 (b) line 3 (c) line 1
24. 24.🐞 This program should draw a regular hexagon (6 equal sides), but it leaves a gap:
    repeat 2 { forward 10 cm; turn right 60° }
    What should the number 2 after “repeat” be?
25. 25.🐞 This program should draw a regular square (4 equal sides), but it leaves a gap:
    repeat 2 { forward 10 cm; turn right 90° }
    What should the number 2 after “repeat” be?
26. 26.🐞 This program should draw a regular triangle (3 equal sides), but the shape does not close:
    repeat 3 { forward 10 cm; turn right 72° }
    What should 72 be changed to?
27. 27.🐞 This program should draw a regular pentagon (5 equal sides), but the shape does not close:
    repeat 5 { forward 10 cm; turn right 90° }
    What should 90 be changed to?
28. 28.🐞 This program should draw a regular hexagon (6 equal sides), but the shape does not close:
    repeat 6 { forward 10 cm; turn right 72° }
    What should 72 be changed to?
29. 29.🔢 To debug a robot program, what comes right after “find the buggy line”? (a) run the program (b) spot what went wrong (c) test it again (d) fix one thing
30. 30.🐞 A robot starts at (5, 2) facing north (the second number counts squares up, the first counts squares across to the east). It should stop on the star at (2, 4). Its program:
    1. forward 3
    2. turn left
    3. forward 3
    It stops at (2, 5) instead. Which line has the bug? (a) line 3 (b) line 2 (c) line 1
31. 31.🐞 This program should draw a regular triangle (3 equal sides), but the shape does not close:
    repeat 3 { forward 10 cm; turn right 45° }
    What should 45 be changed to?
32. 32.🔢 To debug a robot program, which comes first: “find the buggy line” or “run the program”? (a) find the buggy line (b) run the program
33. 33.🔢 To debug a robot program, which comes first: “test it again” or “find the buggy line”? (a) test it again (b) find the buggy line
34. 34.🔢 To debug a robot program, which is the LAST step? (a) run the program (b) fix one thing (c) spot what went wrong (d) test it again
35. 35.🐞 A robot starts at (5, 0) facing north (the second number counts squares up, the first counts squares across to the east). It should stop on the star at (4, 3). Its program:
    1. forward 3
    2. turn right
    3. forward 1
    It stops at (6, 3) instead. Which line has the bug? (a) line 1 (b) line 2 (c) line 3
36. 36.🐞 A robot starts at (4, 1) facing north (the second number counts squares up, the first counts squares across to the east). It should stop on the star at (7, 3). Its program:
    1. forward 3
    2. turn right
    3. forward 3
    It stops at (7, 4) instead. Which line has the bug? (a) line 2 (b) line 3 (c) line 1
37. 37.🔢 To debug a robot program, which comes first: “find the buggy line” or “fix one thing”? (a) find the buggy line (b) fix one thing
38. 38.🔢 To debug a robot program, what comes right after “fix one thing”? (a) spot what went wrong (b) test it again (c) find the buggy line (d) run the program
39. 39.🔢 To debug a robot program, which comes first: “run the program” or “find the buggy line”? (a) find the buggy line (b) run the program
40. 40.🐞 A robot starts at (4, 1) facing north (the second number counts squares up, the first counts squares across to the east). It should stop on the star at (6, 5). Its program:
    1. forward 4
    2. turn right
    3. forward 1
    It stops at (5, 5) instead. Which line has the bug? (a) line 3 (b) line 2 (c) line 1

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