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Robotics Worksheet: Stopping Distance

Robotics lesson 27: Stopping in time · Set 8 · 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 needs 15 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)?
  2. 2.🛑 When should a robot start slowing down? (a) never (b) after hitting the wall (c) before it is too close (d) only when it is off
  3. 3.🛑 A robot is 250 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 20 cm away. How many seconds does the whole trip take?
  4. 4.🛑 A robot is 480 cm from a wall. It drives at 50 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?
  5. 5.🛑 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)? =
  6. 6.🛑 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)? =
  7. 7.🛑 A robot is 115 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.🛑 Why do robots check their sensors many times a second? (a) to waste battery (b) to react in time (c) to feel tired (d) to look busy
  9. 9.🛑 A faster robot needs a … distance to stop. (a) negative (b) shorter (c) zero (d) longer
  10. 10.🛑 A robot moves 30 cm every second and checks its distance sensor every 250 ms. How far does it move between two checks (in cm)? =
  11. 11.🛑 A robot needs 55 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)?
  12. 12.🛑 A robot is 170 cm from a wall. It drives at 20 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?
  13. 13.🛑 A robot is 240 cm from a wall. It drives at 20 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?
  14. 14.🛑 Why can a moving robot not stop instantly? (a) it keeps moving a bit (b) it likes to slide (c) brakes are magic (d) it is too light
  15. 15.🛑 A robot is 50 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?
  16. 16.🛑 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?
  17. 17.🛑 A robot is 40 cm from a wall and drives towards it at 10 cm per second. It must stop 10 cm before the wall. For how many seconds can it drive?
  18. 18.🛑 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)? =
  19. 19.🛑 A robot needs 125 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)?
  20. 20.🛑 A robot is 110 cm from a wall and drives towards it at 10 cm per second. It must stop 10 cm before the wall. For how many seconds can it drive?
  21. 21.🛑 A robot needs 50 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)?
  22. 22.🛑 A robot is 260 cm from a wall. It drives at 40 cm per second until it is 60 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?
  23. 23.🛑 A robot needs 105 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)?
  24. 24.🛑 A robot is 40 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 210 cm from a wall. It drives at 50 cm per second until it is 60 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?
  26. 26.🛑 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?
  27. 27.🛑 A robot needs 95 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 140 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 20 cm away. How many seconds does the whole trip take?
  29. 29.🛑 A robot is 40 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?
  30. 30.🛑 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)? =
  31. 31.🛑 A robot is 170 cm from a wall and drives towards it at 15 cm per second. It must stop 20 cm before the wall. For how many seconds can it drive?
  32. 32.🛑 A robot is 110 cm from a wall. It drives at 25 cm per second until it is 60 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?
  33. 33.🛑 A robot is 70 cm from a wall and drives towards it at 20 cm per second. It must stop 30 cm before the wall. For how many seconds can it drive?
  34. 34.🛑 A robot moves 30 cm every second and checks its distance sensor every 500 ms. How far does it move between two checks (in cm)? =
  35. 35.🛑 A robot needs 65 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)?
  36. 36.🛑 A robot is 225 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 20 cm away. How many seconds does the whole trip take?
  37. 37.🛑 A robot is 65 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?
  38. 38.🛑 A robot is 30 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?
  39. 39.🛑 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?
  40. 40.🛑 A robot moves 50 cm every second and checks its distance sensor every 250 ms. How far does it move between two checks (in cm)? =

Answer key

  1. 115
  2. before it is too close
  3. 14
  4. 15
  5. 6
  6. 5
  7. 7
  8. to react in time
  9. longer
  10. 7.5
  11. 85
  12. 12
  13. 16
  14. it keeps moving a bit
  15. 6
  16. 11
  17. 3
  18. 3
  19. 25
  20. 10
  21. 70
  22. 9
  23. 15
  24. 2
  25. 8
  26. 14
  27. 5
  28. 14
  29. 6
  30. 4
  31. 10
  32. 7
  33. 2
  34. 15
  35. 25
  36. 13
  37. 9
  38. 2
  39. 5
  40. 12.5

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