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Robotics Worksheet: Stopping Distance

Robotics lesson 27: Stopping in time · Set 16 · 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 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?
  2. 2.🛑 A robot is 90 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?
  3. 3.🛑 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)? =
  4. 4.🛑 A robot needs 20 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)?
  5. 5.🛑 A robot is 30 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?
  6. 6.🛑 A robot is 90 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?
  7. 7.🛑 A faster robot needs a … distance to stop. (a) shorter (b) negative (c) longer (d) zero
  8. 8.🛑 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)? =
  9. 9.🛑 A robot needs 45 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)?
  10. 10.🛑 Why can a moving robot not stop instantly? (a) it is too light (b) brakes are magic (c) it keeps moving a bit (d) it likes to slide
  11. 11.🛑 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)? =
  12. 12.🛑 Why do robots check their sensors many times a second? (a) to look busy (b) to react in time (c) to feel tired (d) to waste battery
  13. 13.🛑 A robot needs 110 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)?
  14. 14.🛑 A robot is 55 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?
  15. 15.🛑 A robot needs 20 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)?
  16. 16.🛑 A robot needs 110 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)?
  17. 17.🛑 A robot needs 65 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)?
  18. 18.🛑 A robot is 225 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?
  19. 19.🛑 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)? =
  20. 20.🛑 A robot is 120 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?
  21. 21.🛑 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)? =
  22. 22.🛑 A robot is 85 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?
  23. 23.🛑 A robot is 75 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?
  24. 24.🛑 A robot needs 30 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)?
  25. 25.🛑 A robot is 150 cm from a wall. It drives at 20 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?
  26. 26.🛑 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)? =
  27. 27.🛑 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?
  28. 28.🛑 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)? =
  29. 29.🛑 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)? =
  30. 30.🛑 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)? =
  31. 31.🛑 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)? =
  32. 32.🛑 A robot needs 70 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)?
  33. 33.🛑 A robot is 50 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?
  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 is 190 cm from a wall. It drives at 20 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?
  36. 36.🛑 A robot is 260 cm from a wall. It drives at 40 cm per second until it is 100 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 190 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?
  38. 38.🛑 A robot is 220 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?
  39. 39.🛑 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?
  40. 40.🛑 A robot needs 70 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)?

Answer key

  1. 6
  2. 8
  3. 15
  4. 110
  5. 2
  6. 7
  7. longer
  8. 2
  9. 45
  10. it keeps moving a bit
  11. 20
  12. to react in time
  13. 40
  14. 9
  15. 90
  16. 10
  17. 15
  18. 13
  19. 7.5
  20. 6
  21. 5
  22. 11
  23. 9
  24. 80
  25. 8
  26. 10
  27. 10
  28. 25
  29. 8
  30. 12.5
  31. 4
  32. 30
  33. 2
  34. 10
  35. 11
  36. 22
  37. 12
  38. 11
  39. 2
  40. 20

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