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Robotics Worksheet: Stopping Distance

Robotics lesson 27: Stopping in time · Set 48 · 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 do robots check their sensors many times a second? (a) to react in time (b) to feel tired (c) to look busy (d) to waste battery
  2. 2.🛑 A robot needs 25 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)?
  3. 3.🛑 A robot is 380 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?
  4. 4.🛑 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)?
  5. 5.🛑 A robot needs 85 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)?
  6. 6.🛑 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)?
  7. 7.🛑 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 10 cm away. How many seconds does the whole trip take?
  8. 8.🛑 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)? =
  9. 9.🛑 A robot moves 40 cm every second and checks its distance sensor every 500 ms. How far does it move between two checks (in cm)? =
  10. 10.🛑 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)? =
  11. 11.🛑 A robot needs 5 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)?
  12. 12.🛑 A robot is 230 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?
  13. 13.🛑 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?
  14. 14.🛑 A robot is 200 cm from a wall. It drives at 50 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?
  15. 15.🛑 A robot is 380 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?
  16. 16.🛑 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?
  17. 17.🛑 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)? =
  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 faster robot needs a … distance to stop. (a) longer (b) negative (c) shorter (d) zero
  20. 20.🛑 A robot needs 10 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)?
  21. 21.🛑 A robot is 155 cm from a wall. It drives at 25 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?
  22. 22.🛑 A robot moves 20 cm every second and checks its distance sensor every 200 ms. How far does it move between two checks (in cm)? =
  23. 23.🛑 A robot is 140 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 10 cm away. How many seconds does the whole trip take?
  24. 24.🛑 A robot needs 30 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)?
  25. 25.🛑 Why can a moving robot not stop instantly? (a) it keeps moving a bit (b) brakes are magic (c) it is too light (d) it likes to slide
  26. 26.🛑 A robot is 50 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?
  27. 27.🛑 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
  28. 28.🛑 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?
  29. 29.🛑 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)? =
  30. 30.🛑 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?
  31. 31.🛑 A robot is 120 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 10 cm away. How many seconds does the whole trip take?
  32. 32.🛑 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)?
  33. 33.🛑 A robot is 235 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?
  34. 34.🛑 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)? =
  35. 35.🛑 A robot moves 50 cm every second and checks its distance sensor every 500 ms. How far does it move between two checks (in cm)? =
  36. 36.🛑 A robot is 230 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?
  37. 37.🛑 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?
  38. 38.🛑 A robot is 130 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?
  39. 39.🛑 A robot is 120 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?
  40. 40.🛑 A robot is 20 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?

Answer key

  1. to react in time
  2. 15
  3. 18
  4. 5
  5. 25
  6. 105
  7. 16
  8. 10
  9. 20
  10. 2
  11. 35
  12. 10
  13. 8
  14. 7
  15. 16
  16. 3
  17. 3
  18. 8
  19. longer
  20. 60
  21. 9
  22. 4
  23. 14
  24. 20
  25. it keeps moving a bit
  26. 4
  27. before it is too close
  28. 6
  29. 2
  30. 2
  31. 13
  32. 40
  33. 15
  34. 2.5
  35. 25
  36. 19
  37. 3
  38. 10
  39. 11
  40. 2

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