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Robotics Worksheet: Stopping Distance

Robotics lesson 27: Stopping in time · Set 198 · 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. 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 10 cm away. How many seconds does the whole trip take?
  2. 2.🛑 A robot is 270 cm from a wall. It drives at 30 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?
  3. 3.🛑 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?
  4. 4.🛑 A robot needs 30 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 moves 10 cm every second and checks its distance sensor every 500 ms. How far does it move between two checks (in cm)? =
  6. 6.🛑 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)? =
  7. 7.🛑 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 20 cm away. How many seconds does the whole trip take?
  8. 8.🛑 A robot is 70 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?
  9. 9.🛑 A robot is 260 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?
  10. 10.🛑 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)? =
  11. 11.🛑 Why can a moving robot not stop instantly? (a) it keeps moving a bit (b) it likes to slide (c) it is too light (d) brakes are magic
  12. 12.🛑 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
  13. 13.🛑 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)? =
  14. 14.🛑 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)? =
  15. 15.🛑 A robot is 130 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?
  16. 16.🛑 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)? =
  17. 17.🛑 A robot is 190 cm from a wall. It drives at 30 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?
  18. 18.🛑 A faster robot needs a … distance to stop. (a) zero (b) shorter (c) negative (d) longer
  19. 19.🛑 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?
  20. 20.🛑 A robot needs 10 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)?
  21. 21.🛑 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)? =
  22. 22.🛑 A robot is 140 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?
  23. 23.🛑 A robot is 300 cm from a wall. It drives at 25 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?
  24. 24.🛑 A robot is 70 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?
  25. 25.🛑 A robot is 290 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?
  26. 26.🛑 A robot is 145 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?
  27. 27.🛑 A robot is 90 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?
  28. 28.🛑 A robot is 120 cm from a wall. It drives at 30 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?
  29. 29.🛑 A robot needs 65 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)?
  30. 30.🛑 A robot is 50 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?
  31. 31.🛑 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?
  32. 32.🛑 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)?
  33. 33.🛑 When should a robot start slowing down? (a) after hitting the wall (b) only when it is off (c) before it is too close (d) never
  34. 34.🛑 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)?
  35. 35.🛑 A robot needs 55 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)?
  36. 36.🛑 A robot needs 85 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)?
  37. 37.🛑 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?
  38. 38.🛑 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)? =
  39. 39.🛑 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)?
  40. 40.🛑 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?

Answer key

  1. 12
  2. 12
  3. 12
  4. 10
  5. 5
  6. 10
  7. 10
  8. 6
  9. 13
  10. 1
  11. it keeps moving a bit
  12. to react in time
  13. 3
  14. 12.5
  15. 5
  16. 4
  17. 21
  18. longer
  19. 6
  20. 80
  21. 25
  22. 6
  23. 26
  24. 8
  25. 14
  26. 9
  27. 6
  28. 12
  29. 65
  30. 4
  31. 6
  32. 40
  33. before it is too close
  34. 15
  35. 15
  36. 15
  37. 4
  38. 10
  39. 105
  40. 2

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