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Robotics Worksheet: Stopping Distance

Robotics lesson 27: Stopping in time · Set 63 · 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 needs 25 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)?
  2. 2.🛑 A robot is 260 cm from a wall. It drives at 25 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?
  3. 3.🛑 When should a robot start slowing down? (a) after hitting the wall (b) before it is too close (c) only when it is off (d) never
  4. 4.🛑 A robot is 500 cm from a wall. It drives at 50 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?
  5. 5.🛑 A robot is 90 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?
  6. 6.🛑 A robot is 400 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 10 cm away. How many seconds does the whole trip take?
  7. 7.🛑 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?
  8. 8.🛑 A robot is 240 cm from a wall. It drives at 20 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?
  9. 9.🛑 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
  10. 10.🛑 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)? =
  11. 11.🛑 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)? =
  12. 12.🛑 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)? =
  13. 13.🛑 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?
  14. 14.🛑 A robot is 25 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 moves 30 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 is 210 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?
  17. 17.🛑 Why do robots check their sensors many times a second? (a) to feel tired (b) to look busy (c) to waste battery (d) to react in time
  18. 18.🛑 A robot needs 30 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)?
  19. 19.🛑 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)? =
  20. 20.🛑 A robot needs 5 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)?
  21. 21.🛑 A robot is 210 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?
  22. 22.🛑 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 10 cm away. How many seconds does the whole trip take?
  23. 23.🛑 A robot needs 60 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)?
  24. 24.🛑 A faster robot needs a … distance to stop. (a) zero (b) negative (c) longer (d) shorter
  25. 25.🛑 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 20 cm away. How many seconds does the whole trip take?
  26. 26.🛑 A robot is 370 cm from a wall. It drives at 40 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 moves 10 cm every second and checks its distance sensor every 250 ms. How far does it move between two checks (in cm)? =
  28. 28.🛑 A robot is 80 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?
  29. 29.🛑 A robot is 120 cm from a wall. It drives at 20 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?
  30. 30.🛑 A robot needs 5 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)?
  31. 31.🛑 A robot is 180 cm from a wall. It drives at 20 cm per second until it is 80 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?
  32. 32.🛑 A robot is 230 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?
  33. 33.🛑 A robot is 240 cm from a wall. It drives at 20 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?
  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 needs 10 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)?
  36. 36.🛑 A robot is 185 cm from a wall. It drives at 25 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?
  37. 37.🛑 A robot is 140 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?
  38. 38.🛑 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)?
  39. 39.🛑 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)? =
  40. 40.🛑 A robot is 280 cm from a wall. It drives at 40 cm per second until it is 80 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?

Answer key

  1. 55
  2. 18
  3. before it is too close
  4. 16
  5. 12
  6. 15
  7. 11
  8. 22
  9. it keeps moving a bit
  10. 2
  11. 10
  12. 25
  13. 17
  14. 3
  15. 3
  16. 10
  17. to react in time
  18. 30
  19. 20
  20. 35
  21. 15
  22. 15
  23. 20
  24. longer
  25. 10
  26. 16
  27. 2.5
  28. 4
  29. 7
  30. 75
  31. 17
  32. 11
  33. 15
  34. 10
  35. 120
  36. 13
  37. 8
  38. 40
  39. 10
  40. 17

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