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Robotics Worksheet: Stopping Distance

Robotics lesson 27: Stopping in time · Set 735 · 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 20 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.🛑 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)? =
  3. 3.🛑 A robot needs 20 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)?
  4. 4.🛑 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)? =
  5. 5.🛑 A faster robot needs a … distance to stop. (a) zero (b) negative (c) shorter (d) longer
  6. 6.🛑 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)?
  7. 7.🛑 When should a robot start slowing down? (a) after hitting the wall (b) never (c) only when it is off (d) before it is too close
  8. 8.🛑 A robot is 260 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?
  9. 9.🛑 A robot is 130 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?
  10. 10.🛑 A robot is 330 cm from a wall. It drives at 50 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?
  11. 11.🛑 A robot is 150 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?
  12. 12.🛑 A robot needs 40 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)?
  13. 13.🛑 A robot needs 5 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)?
  14. 14.🛑 A robot is 160 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?
  15. 15.🛑 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)? =
  16. 16.🛑 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)?
  17. 17.🛑 A robot needs 5 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)?
  18. 18.🛑 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)? =
  19. 19.🛑 Why do robots check their sensors many times a second? (a) to waste battery (b) to feel tired (c) to react in time (d) to look busy
  20. 20.🛑 A robot is 200 cm from a wall. It drives at 20 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?
  21. 21.🛑 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?
  22. 22.🛑 A robot is 225 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 20 cm away. How many seconds does the whole trip take?
  23. 23.🛑 A robot needs 105 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)?
  24. 24.🛑 A robot is 60 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?
  25. 25.🛑 A robot is 155 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 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.🛑 Why can a moving robot not stop instantly? (a) it likes to slide (b) it is too light (c) it keeps moving a bit (d) brakes are magic
  28. 28.🛑 A robot is 200 cm from a wall. It drives at 50 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?
  29. 29.🛑 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?
  30. 30.🛑 A robot is 220 cm from a wall. It drives at 40 cm per second until it is 60 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?
  31. 31.🛑 A robot is 55 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?
  32. 32.🛑 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?
  33. 33.🛑 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)? =
  34. 34.🛑 A robot is 115 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?
  35. 35.🛑 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)? =
  36. 36.🛑 A robot is 300 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 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?
  38. 38.🛑 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)? =
  39. 39.🛑 A robot is 180 cm from a wall. It drives at 40 cm per second until it is 60 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?
  40. 40.🛑 A robot needs 95 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)?

Answer key

  1. 14
  2. 5
  3. 80
  4. 5
  5. longer
  6. 65
  7. before it is too close
  8. 12
  9. 5
  10. 12
  11. 12
  12. 60
  13. 95
  14. 7
  15. 4
  16. 35
  17. 145
  18. 3
  19. to react in time
  20. 21
  21. 13
  22. 21
  23. 35
  24. 2
  25. 17
  26. 2
  27. it keeps moving a bit
  28. 9
  29. 7
  30. 12
  31. 5
  32. 7
  33. 1
  34. 7
  35. 2
  36. 23
  37. 11
  38. 10
  39. 11
  40. 45

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