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Robotics Worksheet: Stopping Distance

Robotics lesson 27: Stopping in time · Set 422 · 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 40 cm away. How far from the wall does it stop (in cm)?
  2. 2.🛑 When should a robot start slowing down? (a) only when it is off (b) never (c) before it is too close (d) after hitting the wall
  3. 3.🛑 A robot needs 20 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)?
  4. 4.🛑 A robot is 175 cm from a wall. It drives at 25 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?
  5. 5.🛑 A faster robot needs a … distance to stop. (a) negative (b) zero (c) longer (d) shorter
  6. 6.🛑 Why do robots check their sensors many times a second? (a) to waste battery (b) to feel tired (c) to look busy (d) to react in time
  7. 7.🛑 A robot needs 20 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)?
  8. 8.🛑 Why can a moving robot not stop instantly? (a) it is too light (b) it keeps moving a bit (c) it likes to slide (d) brakes are magic
  9. 9.🛑 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)? =
  10. 10.🛑 A robot is 125 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?
  11. 11.🛑 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?
  12. 12.🛑 A robot is 65 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?
  13. 13.🛑 A robot is 60 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?
  14. 14.🛑 A robot is 145 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?
  15. 15.🛑 A robot is 230 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?
  16. 16.🛑 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)? =
  17. 17.🛑 A robot needs 90 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)?
  18. 18.🛑 A robot needs 15 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)?
  19. 19.🛑 A robot is 290 cm from a wall. It drives at 40 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?
  20. 20.🛑 A robot is 70 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?
  21. 21.🛑 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?
  22. 22.🛑 A robot is 95 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?
  23. 23.🛑 A robot is 60 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?
  24. 24.🛑 A robot is 190 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?
  25. 25.🛑 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?
  26. 26.🛑 A robot is 90 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?
  27. 27.🛑 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)? =
  28. 28.🛑 A robot needs 15 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)?
  29. 29.🛑 A robot needs 105 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)?
  30. 30.🛑 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?
  31. 31.🛑 A robot needs 5 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)?
  32. 32.🛑 A robot is 200 cm from a wall. It drives at 50 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?
  33. 33.🛑 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?
  34. 34.🛑 A robot is 180 cm from a wall. It drives at 30 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?
  35. 35.🛑 A robot moves 10 cm every second and checks its distance sensor every 250 ms. How far does it move between two checks (in cm)? =
  36. 36.🛑 A robot needs 15 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)?
  37. 37.🛑 A robot is 50 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?
  38. 38.🛑 A robot is 370 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 20 cm away. How many seconds does the whole trip take?
  39. 39.🛑 A robot is 460 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 20 cm away. How many seconds does the whole trip take?
  40. 40.🛑 A robot is 240 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?

Answer key

  1. 25
  2. before it is too close
  3. 50
  4. 9
  5. longer
  6. to react in time
  7. 20
  8. it keeps moving a bit
  9. 2
  10. 7
  11. 7
  12. 3
  13. 2
  14. 9
  15. 11
  16. 2
  17. 10
  18. 55
  19. 12
  20. 12
  21. 7
  22. 5
  23. 10
  24. 8
  25. 3
  26. 6
  27. 5
  28. 105
  29. 35
  30. 8
  31. 105
  32. 11
  33. 6
  34. 8
  35. 2.5
  36. 75
  37. 3
  38. 11
  39. 12
  40. 22

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