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Robotics Worksheet: Stopping Distance

Robotics lesson 27: Stopping in time · Set 81 · 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 can a moving robot not stop instantly? (a) it is too light (b) brakes are magic (c) it likes to slide (d) it keeps moving a bit
  2. 2.🛑 A robot is 200 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?
  3. 3.🛑 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)? =
  4. 4.🛑 A robot is 140 cm from a wall. It drives at 30 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?
  5. 5.🛑 A robot is 290 cm from a wall. It drives at 30 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?
  6. 6.🛑 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?
  7. 7.🛑 A robot is 250 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?
  8. 8.🛑 A robot needs 5 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)?
  9. 9.🛑 When should a robot start slowing down? (a) only when it is off (b) before it is too close (c) after hitting the wall (d) never
  10. 10.🛑 A robot needs 10 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)?
  11. 11.🛑 A robot needs 105 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)?
  12. 12.🛑 A robot is 175 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 needs 10 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)?
  14. 14.🛑 A robot is 35 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?
  15. 15.🛑 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)? =
  16. 16.🛑 A robot is 40 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?
  17. 17.🛑 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?
  18. 18.🛑 A robot needs 25 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)?
  19. 19.🛑 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)? =
  20. 20.🛑 A robot needs 130 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)?
  21. 21.🛑 A robot is 80 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?
  22. 22.🛑 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)? =
  23. 23.🛑 A robot is 85 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?
  24. 24.🛑 A robot is 90 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?
  25. 25.🛑 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?
  26. 26.🛑 A robot is 200 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?
  27. 27.🛑 A robot needs 10 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)?
  28. 28.🛑 A robot needs 5 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)?
  29. 29.🛑 A robot needs 35 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)?
  30. 30.🛑 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)? =
  31. 31.🛑 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
  32. 32.🛑 A robot is 140 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?
  33. 33.🛑 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?
  34. 34.🛑 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)? =
  35. 35.🛑 A robot needs 45 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)?
  36. 36.🛑 A robot is 170 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 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?
  38. 38.🛑 A robot is 45 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?
  39. 39.🛑 A robot is 135 cm from a wall. It drives at 25 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?
  40. 40.🛑 A robot needs 25 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)?

Answer key

  1. it keeps moving a bit
  2. 13
  3. 7.5
  4. 9
  5. 14
  6. 12
  7. 11
  8. 135
  9. before it is too close
  10. 140
  11. 25
  12. 11
  13. 40
  14. 3
  15. 20
  16. 6
  17. 12
  18. 95
  19. 2.5
  20. 10
  21. 5
  22. 15
  23. 5
  24. 4
  25. 2
  26. 14
  27. 90
  28. 55
  29. 85
  30. 2
  31. to react in time
  32. 12
  33. 4
  34. 12.5
  35. 15
  36. 8
  37. 4
  38. 5
  39. 7
  40. 35

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