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Robotics Worksheet: Stopping Distance

Robotics lesson 27: Stopping in time · Set 160 · 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 200 cm from a wall. It drives at 50 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.🛑 Why can a moving robot not stop instantly? (a) brakes are magic (b) it is too light (c) it keeps moving a bit (d) it likes to slide
  3. 3.🛑 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
  4. 4.🛑 A robot is 110 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?
  5. 5.🛑 A faster robot needs a … distance to stop. (a) zero (b) negative (c) longer (d) shorter
  6. 6.🛑 A robot needs 60 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)?
  7. 7.🛑 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)? =
  8. 8.🛑 A robot is 90 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?
  9. 9.🛑 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?
  10. 10.🛑 A robot is 500 cm from a wall. It drives at 50 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?
  11. 11.🛑 A robot is 280 cm from a wall. It drives at 40 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?
  12. 12.🛑 A robot is 260 cm from a wall. It drives at 30 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 130 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 10 cm away. How many seconds does the whole trip take?
  14. 14.🛑 A robot is 135 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?
  15. 15.🛑 A robot is 130 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 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)?
  17. 17.🛑 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)? =
  18. 18.🛑 A robot is 120 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?
  19. 19.🛑 A robot is 150 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?
  20. 20.🛑 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)? =
  21. 21.🛑 A robot is 280 cm from a wall. It drives at 25 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?
  22. 22.🛑 A robot is 100 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?
  23. 23.🛑 A robot is 30 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 170 cm from a wall. It drives at 30 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?
  25. 25.🛑 A robot is 250 cm from a wall. It drives at 50 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?
  26. 26.🛑 A robot is 40 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?
  27. 27.🛑 A robot is 230 cm from a wall. It drives at 30 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?
  28. 28.🛑 A robot is 300 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 20 cm away. How many seconds does the whole trip take?
  29. 29.🛑 A robot is 70 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?
  30. 30.🛑 A robot is 170 cm from a wall. It drives at 30 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?
  31. 31.🛑 A robot needs 20 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)?
  32. 32.🛑 A robot is 160 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?
  33. 33.🛑 A robot needs 100 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)?
  34. 34.🛑 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)? =
  35. 35.🛑 A robot is 360 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?
  36. 36.🛑 A robot is 110 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?
  37. 37.🛑 A robot is 210 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 10 cm away. How many seconds does the whole trip take?
  38. 38.🛑 A robot is 70 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?
  39. 39.🛑 A robot is 210 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?
  40. 40.🛑 A robot is 110 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?

Answer key

  1. 11
  2. it keeps moving a bit
  3. to react in time
  4. 6
  5. longer
  6. 70
  7. 2
  8. 3
  9. 11
  10. 24
  11. 17
  12. 13
  13. 10
  14. 7
  15. 6
  16. 105
  17. 4
  18. 11
  19. 10
  20. 1
  21. 20
  22. 6
  23. 4
  24. 7
  25. 12
  26. 2
  27. 9
  28. 13
  29. 3
  30. 12
  31. 60
  32. 10
  33. 10
  34. 4
  35. 11
  36. 5
  37. 8
  38. 5
  39. 7
  40. 8

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