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Robotics Worksheet: Stopping Distance

Robotics lesson 27: Stopping in time · Set 113 · 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.🛑 Why can a moving robot not stop instantly? (a) brakes are magic (b) it likes to slide (c) it keeps moving a bit (d) it is too light
  2. 2.🛑 A robot needs 35 cm to stop once it brakes. It starts braking when its sensor sees a wall 120 cm away. How far from the wall does it stop (in cm)?
  3. 3.🛑 A robot is 170 cm from a wall. It drives at 30 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?
  4. 4.🛑 A faster robot needs a … distance to stop. (a) negative (b) shorter (c) longer (d) zero
  5. 5.🛑 Why do robots check their sensors many times a second? (a) to feel tired (b) to react in time (c) to waste battery (d) to look busy
  6. 6.🛑 A robot needs 40 cm to stop once it brakes. It starts braking when its sensor sees a wall 70 cm away. How far from the wall does it stop (in cm)?
  7. 7.🛑 A robot needs 65 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)?
  8. 8.🛑 A robot needs 50 cm to stop once it brakes. It starts braking when its sensor sees a wall 90 cm away. How far from the wall does it stop (in cm)?
  9. 9.🛑 A robot needs 10 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)?
  10. 10.🛑 When should a robot start slowing down? (a) after hitting the wall (b) only when it is off (c) before it is too close (d) never
  11. 11.🛑 A robot is 320 cm from a wall. It drives at 40 cm per second until it is 80 cm away, then slows to 10 cm per second and stops when it is 20 cm away. How many seconds does the whole trip take?
  12. 12.🛑 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)? =
  13. 13.🛑 A robot is 75 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?
  14. 14.🛑 A robot is 280 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?
  15. 15.🛑 A robot is 260 cm from a wall. It drives at 30 cm per second until it is 50 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?
  16. 16.🛑 A robot is 100 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?
  17. 17.🛑 A robot is 260 cm from a wall. It drives at 40 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?
  18. 18.🛑 A robot is 85 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?
  19. 19.🛑 A robot moves 40 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 moves 20 cm every second and checks its distance sensor every 250 ms. How far does it move between two checks (in cm)? =
  21. 21.🛑 A robot needs 5 cm to stop once it brakes. It starts braking when its sensor sees a wall 90 cm away. How far from the wall does it stop (in cm)?
  22. 22.🛑 A robot is 45 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?
  23. 23.🛑 A robot is 80 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?
  24. 24.🛑 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)? =
  25. 25.🛑 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 10 cm away. How many seconds does the whole trip take?
  26. 26.🛑 A robot is 120 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?
  27. 27.🛑 A robot is 100 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?
  28. 28.🛑 A robot is 150 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?
  29. 29.🛑 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)? =
  30. 30.🛑 A robot is 60 cm from a wall and drives towards it at 20 cm per second. It must stop 20 cm before the wall. For how many seconds can it drive?
  31. 31.🛑 A robot needs 30 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)?
  32. 32.🛑 A robot is 45 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?
  33. 33.🛑 A robot is 130 cm from a wall. It drives at 40 cm per second until it is 50 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 is 180 cm from a wall. It drives at 50 cm per second until it is 80 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?
  35. 35.🛑 A robot is 170 cm from a wall. It drives at 30 cm per second until it is 50 cm away, then slows to 10 cm per second and stops when it is 20 cm away. How many seconds does the whole trip take?
  36. 36.🛑 A robot is 140 cm from a wall and drives towards it at 20 cm per second. It must stop 20 cm before the wall. For how many seconds can it drive?
  37. 37.🛑 A robot moves 50 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 needs 75 cm to stop once it brakes. It starts braking when its sensor sees a wall 110 cm away. How far from the wall does it stop (in cm)?
  39. 39.🛑 A robot needs 45 cm to stop once it brakes. It starts braking when its sensor sees a wall 70 cm away. How far from the wall does it stop (in cm)?
  40. 40.🛑 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)? =

Answer key

  1. it keeps moving a bit
  2. 85
  3. 12
  4. longer
  5. to react in time
  6. 30
  7. 75
  8. 40
  9. 40
  10. before it is too close
  11. 12
  12. 5
  13. 11
  14. 24
  15. 13
  16. 8
  17. 13
  18. 11
  19. 4
  20. 5
  21. 85
  22. 5
  23. 5
  24. 2
  25. 26
  26. 6
  27. 6
  28. 7
  29. 1
  30. 2
  31. 110
  32. 3
  33. 6
  34. 14
  35. 7
  36. 6
  37. 10
  38. 35
  39. 25
  40. 8

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