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Robotics Worksheet: Stopping Distance

Robotics lesson 27: Stopping in time · Set 9 · 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.🛑 When should a robot start slowing down? (a) never (b) only when it is off (c) after hitting the wall (d) before it is too close
  2. 2.🛑 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)? =
  3. 3.🛑 A robot needs 40 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)?
  4. 4.🛑 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)? =
  5. 5.🛑 A robot is 90 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?
  6. 6.🛑 Why can a moving robot not stop instantly? (a) it is too light (b) it keeps moving a bit (c) brakes are magic (d) it likes to slide
  7. 7.🛑 A robot is 220 cm from a wall. It drives at 30 cm per second until it is 100 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?
  8. 8.🛑 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?
  9. 9.🛑 A faster robot needs a … distance to stop. (a) longer (b) zero (c) negative (d) shorter
  10. 10.🛑 A robot is 260 cm from a wall. It drives at 25 cm per second until it is 60 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?
  11. 11.🛑 A robot is 80 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?
  12. 12.🛑 A robot is 40 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?
  13. 13.🛑 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)? =
  14. 14.🛑 A robot needs 30 cm to stop once it brakes. It starts braking when its sensor sees a wall 60 cm away. How far from the wall does it stop (in cm)?
  15. 15.🛑 A robot is 120 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 20 cm away. How many seconds does the whole trip take?
  16. 16.🛑 Why do robots check their sensors many times a second? (a) to feel tired (b) to react in time (c) to look busy (d) to waste battery
  17. 17.🛑 A robot moves 40 cm every second and checks its distance sensor every 250 ms. How far does it move between two checks (in cm)? =
  18. 18.🛑 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)? =
  19. 19.🛑 A robot is 220 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 20 cm away. How many seconds does the whole trip take?
  20. 20.🛑 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)? =
  21. 21.🛑 A robot is 110 cm from a wall. It drives at 25 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?
  22. 22.🛑 A robot is 140 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 moves 50 cm every second and checks its distance sensor every 100 ms. How far does it move between two checks (in cm)? =
  24. 24.🛑 A robot is 310 cm from a wall. It drives at 30 cm per second until it is 100 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?
  25. 25.🛑 A robot needs 5 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)?
  26. 26.🛑 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)? =
  27. 27.🛑 A robot is 160 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?
  28. 28.🛑 A robot needs 45 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)?
  29. 29.🛑 A robot needs 60 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)?
  30. 30.🛑 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)? =
  31. 31.🛑 A robot is 270 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?
  32. 32.🛑 A robot moves 10 cm every second and checks its distance sensor every 500 ms. How far does it move between two checks (in cm)? =
  33. 33.🛑 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)? =
  34. 34.🛑 A robot moves 20 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 moves 30 cm every second and checks its distance sensor every 100 ms. How far does it move between two checks (in cm)? =
  36. 36.🛑 A robot needs 40 cm to stop once it brakes. It starts braking when its sensor sees a wall 80 cm away. How far from the wall does it stop (in cm)?
  37. 37.🛑 A robot is 310 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 20 cm away. How many seconds does the whole trip take?
  38. 38.🛑 A robot is 300 cm from a wall. It drives at 30 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?
  39. 39.🛑 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)?
  40. 40.🛑 A robot needs 105 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)?

Answer key

  1. before it is too close
  2. 12.5
  3. 10
  4. 7.5
  5. 4
  6. it keeps moving a bit
  7. 12
  8. 2
  9. longer
  10. 18
  11. 7
  12. 2
  13. 6
  14. 30
  15. 14
  16. to react in time
  17. 10
  18. 8
  19. 13
  20. 2
  21. 10
  22. 8
  23. 5
  24. 15
  25. 45
  26. 2
  27. 8
  28. 105
  29. 10
  30. 2.5
  31. 11
  32. 5
  33. 10
  34. 10
  35. 3
  36. 40
  37. 23
  38. 16
  39. 5
  40. 5

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