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Robotics Worksheet: Stopping Distance

Robotics lesson 27: Stopping in time · Set 164 · 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 is 300 cm from a wall. It drives at 25 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?
  2. 2.🛑 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)? =
  3. 3.🛑 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?
  4. 4.🛑 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 20 cm away. How many seconds does the whole trip take?
  5. 5.🛑 A robot is 80 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?
  6. 6.🛑 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)? =
  7. 7.🛑 A robot needs 80 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)?
  8. 8.🛑 A robot is 55 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?
  9. 9.🛑 A robot is 50 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?
  10. 10.🛑 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
  11. 11.🛑 A robot is 185 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?
  12. 12.🛑 A robot needs 5 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)?
  13. 13.🛑 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)? =
  14. 14.🛑 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)? =
  15. 15.🛑 A robot needs 40 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)?
  16. 16.🛑 A robot is 150 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?
  17. 17.🛑 A robot is 80 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?
  18. 18.🛑 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)?
  19. 19.🛑 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)? =
  20. 20.🛑 A robot needs 35 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)?
  21. 21.🛑 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?
  22. 22.🛑 A robot needs 65 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)?
  23. 23.🛑 A robot is 185 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?
  24. 24.🛑 A robot is 160 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 20 cm away. How many seconds does the whole trip take?
  25. 25.🛑 A robot needs 15 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)?
  26. 26.🛑 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?
  27. 27.🛑 A robot is 460 cm from a wall. It drives at 50 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?
  28. 28.🛑 A robot is 100 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?
  29. 29.🛑 A robot needs 35 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)?
  30. 30.🛑 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?
  31. 31.🛑 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)?
  32. 32.🛑 A robot is 275 cm from a wall. It drives at 25 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?
  33. 33.🛑 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
  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 is 260 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?
  36. 36.🛑 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)? =
  37. 37.🛑 A faster robot needs a … distance to stop. (a) negative (b) shorter (c) zero (d) longer
  38. 38.🛑 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)? =
  39. 39.🛑 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)? =
  40. 40.🛑 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)? =

Answer key

  1. 17
  2. 10
  3. 11
  4. 9
  5. 6
  6. 5
  7. 40
  8. 3
  9. 2
  10. it keeps moving a bit
  11. 13
  12. 145
  13. 20
  14. 1
  15. 100
  16. 6
  17. 3
  18. 35
  19. 8
  20. 15
  21. 7
  22. 85
  23. 11
  24. 11
  25. 45
  26. 2
  27. 18
  28. 10
  29. 25
  30. 5
  31. 20
  32. 16
  33. to react in time
  34. 15
  35. 12
  36. 10
  37. longer
  38. 4
  39. 10
  40. 2

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