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Robotics Worksheet: Stopping Distance

Robotics lesson 27: Stopping in time · Set 34 · 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 likes to slide (b) it keeps moving a bit (c) it is too light (d) brakes are magic
  2. 2.🛑 A robot is 75 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?
  3. 3.🛑 Why do robots check their sensors many times a second? (a) to feel tired (b) to waste battery (c) to look busy (d) to react in time
  4. 4.🛑 A robot is 170 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?
  5. 5.🛑 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)? =
  6. 6.🛑 A robot is 80 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?
  7. 7.🛑 When should a robot start slowing down? (a) before it is too close (b) never (c) after hitting the wall (d) only when it is off
  8. 8.🛑 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)? =
  9. 9.🛑 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?
  10. 10.🛑 A faster robot needs a … distance to stop. (a) negative (b) zero (c) longer (d) shorter
  11. 11.🛑 A robot needs 20 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)?
  12. 12.🛑 A robot is 50 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?
  13. 13.🛑 A robot is 30 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?
  14. 14.🛑 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?
  15. 15.🛑 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?
  16. 16.🛑 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?
  17. 17.🛑 A robot moves 50 cm every second and checks its distance sensor every 100 ms. How far does it move between two checks (in cm)? =
  18. 18.🛑 A robot is 210 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?
  19. 19.🛑 A robot needs 35 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)?
  20. 20.🛑 A robot needs 90 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)?
  21. 21.🛑 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 20 cm away. How many seconds does the whole trip take?
  22. 22.🛑 A robot is 320 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?
  23. 23.🛑 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)? =
  24. 24.🛑 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?
  25. 25.🛑 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?
  26. 26.🛑 A robot needs 75 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)?
  27. 27.🛑 A robot needs 55 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)?
  28. 28.🛑 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)? =
  29. 29.🛑 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?
  30. 30.🛑 A robot is 220 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?
  31. 31.🛑 A robot needs 15 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)?
  32. 32.🛑 A robot moves 20 cm every second and checks its distance sensor every 250 ms. How far does it move between two checks (in cm)? =
  33. 33.🛑 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)?
  34. 34.🛑 A robot is 140 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 10 cm away. How many seconds does the whole trip take?
  35. 35.🛑 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)?
  36. 36.🛑 A robot is 170 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?
  37. 37.🛑 A robot is 50 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 220 cm from a wall. It drives at 30 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 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 is 155 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?

Answer key

  1. it keeps moving a bit
  2. 3
  3. to react in time
  4. 14
  5. 25
  6. 12
  7. before it is too close
  8. 2.5
  9. 12
  10. longer
  11. 40
  12. 3
  13. 2
  14. 8
  15. 11
  16. 2
  17. 5
  18. 16
  19. 115
  20. 20
  21. 11
  22. 15
  23. 4
  24. 26
  25. 3
  26. 35
  27. 5
  28. 5
  29. 9
  30. 10
  31. 85
  32. 5
  33. 45
  34. 7
  35. 140
  36. 9
  37. 8
  38. 12
  39. 10
  40. 9

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