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Robotics Worksheet: Stopping Distance

Robotics lesson 27: Stopping in time · Set 222 · 40 questions
TalentJR

Robot tip (Room ÷ speed): Room = distance now − gap to keep; time = room ÷ speed. Stopping point = distance when braking starts − braking distance. Distance between sensor checks = speed × time between checks (ms ÷ 1000 for seconds).

NameDateTime takenScore ___ / 40
  1. 1.🛑 A robot is 40 cm from a wall and drives towards it at 10 cm per second. It must stop 20 cm before the wall. For how many seconds can it drive?
  2. 2.🛑 Why do robots check their sensors many times a second? (a) to look busy (b) to waste battery (c) to react in time (d) to feel tired
  3. 3.🛑 A robot needs 55 cm to stop once it brakes. It starts braking when its sensor sees a wall 150 cm away. How far from the wall does it stop (in cm)?
  4. 4.🛑 A robot moves 10 cm every second and checks its distance sensor every 100 ms. How far does it move between two checks (in cm)? =
  5. 5.🛑 A robot needs 25 cm to stop once it brakes. It starts braking when its sensor sees a wall 100 cm away. How far from the wall does it stop (in cm)?
  6. 6.🛑 Why can a moving robot not stop instantly? (a) it keeps moving a bit (b) it is too light (c) it likes to slide (d) brakes are magic
  7. 7.🛑 A robot is 70 cm from a wall and drives towards it at 15 cm per second. It must stop 10 cm before the wall. For how many seconds can it drive?
  8. 8.🛑 A robot is 180 cm from a wall and drives towards it at 15 cm per second. It must stop 30 cm before the wall. For how many seconds can it drive?
  9. 9.🛑 A robot needs 35 cm to stop once it brakes. It starts braking when its sensor sees a wall 140 cm away. How far from the wall does it stop (in cm)?
  10. 10.🛑 A robot moves 40 cm every second and checks its distance sensor every 200 ms. How far does it move between two checks (in cm)? =
  11. 11.🛑 A robot needs 25 cm to stop once it brakes. It starts braking when its sensor sees a wall 50 cm away. How far from the wall does it stop (in cm)?
  12. 12.🛑 A robot moves 30 cm every second and checks its distance sensor every 200 ms. How far does it move between two checks (in cm)? =
  13. 13.🛑 A robot is 260 cm from a wall. It drives at 30 cm per second until it is 80 cm away, then slows to 5 cm per second and stops when it is 10 cm away. How many seconds does the whole trip take?
  14. 14.🛑 A robot needs 35 cm to stop once it brakes. It starts braking when its sensor sees a wall 130 cm away. How far from the wall does it stop (in cm)?
  15. 15.🛑 A robot needs 85 cm to stop once it brakes. It starts braking when its sensor sees a wall 140 cm away. How far from the wall does it stop (in cm)?
  16. 16.🛑 A robot is 120 cm from a wall and drives towards it at 10 cm per second. It must stop 30 cm before the wall. For how many seconds can it drive?
  17. 17.🛑 A robot is 420 cm from a wall. It drives at 40 cm per second until it is 100 cm away, then slows to 5 cm per second and stops when it is 20 cm away. How many seconds does the whole trip take?
  18. 18.🛑 A faster robot needs a … distance to stop. (a) negative (b) zero (c) shorter (d) longer
  19. 19.🛑 A robot moves 30 cm every second and checks its distance sensor every 100 ms. How far does it move between two checks (in cm)? =
  20. 20.🛑 A robot is 35 cm from a wall and drives towards it at 5 cm per second. It must stop 20 cm before the wall. For how many seconds can it drive?
  21. 21.🛑 A robot is 50 cm from a wall and drives towards it at 5 cm per second. It must stop 10 cm before the wall. For how many seconds can it drive?
  22. 22.🛑 A robot moves 50 cm every second and checks its distance sensor every 100 ms. How far does it move between two checks (in cm)? =
  23. 23.🛑 A robot is 85 cm from a wall and drives towards it at 15 cm per second. It must stop 10 cm before the wall. For how many seconds can it drive?
  24. 24.🛑 A robot is 65 cm from a wall and drives towards it at 5 cm per second. It must stop 30 cm before the wall. For how many seconds can it drive?
  25. 25.🛑 A robot is 90 cm from a wall and drives towards it at 20 cm per second. It must stop 10 cm before the wall. For how many seconds can it drive?
  26. 26.🛑 A robot is 200 cm from a wall. It drives at 20 cm per second until it is 80 cm away, then slows to 5 cm per second and stops when it is 10 cm away. How many seconds does the whole trip take?
  27. 27.🛑 A robot needs 35 cm to stop once it brakes. It starts braking when its sensor sees a wall 100 cm away. How far from the wall does it stop (in cm)?
  28. 28.🛑 A robot is 300 cm from a wall. It drives at 25 cm per second until it is 100 cm away, then slows to 10 cm per second and stops when it is 10 cm away. How many seconds does the whole trip take?
  29. 29.🛑 A robot is 105 cm from a wall and drives towards it at 15 cm per second. It must stop 30 cm before the wall. For how many seconds can it drive?
  30. 30.🛑 A robot needs 35 cm to stop once it brakes. It starts braking when its sensor sees a wall 50 cm away. How far from the wall does it stop (in cm)?
  31. 31.🛑 A robot is 200 cm from a wall. It drives at 25 cm per second until it is 50 cm away, then slows to 5 cm per second and stops when it is 10 cm away. How many seconds does the whole trip take?
  32. 32.🛑 A robot is 220 cm from a wall. It drives at 20 cm per second until it is 60 cm away, then slows to 5 cm per second and stops when it is 20 cm away. How many seconds does the whole trip take?
  33. 33.🛑 A robot is 200 cm from a wall. It drives at 20 cm per second until it is 80 cm away, then slows to 10 cm per second and stops when it is 10 cm away. How many seconds does the whole trip take?
  34. 34.🛑 A robot moves 20 cm every second and checks its distance sensor every 100 ms. How far does it move between two checks (in cm)? =
  35. 35.🛑 A robot is 140 cm from a wall and drives towards it at 10 cm per second. It must stop 30 cm before the wall. For how many seconds can it drive?
  36. 36.🛑 A robot needs 35 cm to stop once it brakes. It starts braking when its sensor sees a wall 40 cm away. How far from the wall does it stop (in cm)?
  37. 37.🛑 A robot moves 10 cm every second and checks its distance sensor every 200 ms. How far does it move between two checks (in cm)? =
  38. 38.🛑 A robot is 190 cm from a wall. It drives at 30 cm per second until it is 100 cm away, then slows to 5 cm per second and stops when it is 10 cm away. How many seconds does the whole trip take?
  39. 39.🛑 A robot is 70 cm from a wall and drives towards it at 20 cm per second. It must stop 10 cm before the wall. For how many seconds can it drive?
  40. 40.🛑 A robot needs 5 cm to stop once it brakes. It starts braking when its sensor sees a wall 130 cm away. How far from the wall does it stop (in cm)?

Answer key

  1. 2
  2. to react in time
  3. 95
  4. 1
  5. 75
  6. it keeps moving a bit
  7. 4
  8. 10
  9. 105
  10. 8
  11. 25
  12. 6
  13. 20
  14. 95
  15. 55
  16. 9
  17. 24
  18. longer
  19. 3
  20. 3
  21. 8
  22. 5
  23. 5
  24. 7
  25. 4
  26. 20
  27. 65
  28. 17
  29. 5
  30. 15
  31. 14
  32. 16
  33. 13
  34. 2
  35. 11
  36. 5
  37. 2
  38. 21
  39. 3
  40. 125

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