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Robotics Worksheet: Stopping Distance

Robotics lesson 27: Stopping in time · Set 115 · 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 150 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?
  2. 2.🛑 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?
  3. 3.🛑 A faster robot needs a … distance to stop. (a) shorter (b) negative (c) zero (d) longer
  4. 4.🛑 A robot is 180 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 10 cm away. How many seconds does the whole trip take?
  5. 5.🛑 Why can a moving robot not stop instantly? (a) it keeps moving a bit (b) it is too light (c) it likes to slide (d) brakes are magic
  6. 6.🛑 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)? =
  7. 7.🛑 Why do robots check their sensors many times a second? (a) to look busy (b) to feel tired (c) to react in time (d) to waste battery
  8. 8.🛑 A robot is 370 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 10 cm away. How many seconds does the whole trip take?
  9. 9.🛑 A robot is 50 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?
  10. 10.🛑 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
  11. 11.🛑 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?
  12. 12.🛑 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)?
  13. 13.🛑 A robot is 110 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?
  14. 14.🛑 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?
  15. 15.🛑 A robot needs 30 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)?
  16. 16.🛑 A robot needs 15 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)?
  17. 17.🛑 A robot is 240 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?
  18. 18.🛑 A robot needs 20 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)?
  19. 19.🛑 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)?
  20. 20.🛑 A robot needs 75 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 needs 65 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)?
  22. 22.🛑 A robot is 60 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?
  23. 23.🛑 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?
  24. 24.🛑 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)? =
  25. 25.🛑 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)? =
  26. 26.🛑 A robot is 130 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?
  27. 27.🛑 A robot needs 60 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)?
  28. 28.🛑 A robot is 140 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?
  29. 29.🛑 A robot is 180 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 20 cm away. How many seconds does the whole trip take?
  30. 30.🛑 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)? =
  31. 31.🛑 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?
  32. 32.🛑 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)?
  33. 33.🛑 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)? =
  34. 34.🛑 A robot is 60 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?
  35. 35.🛑 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)? =
  36. 36.🛑 A robot needs 75 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)?
  37. 37.🛑 A robot is 140 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 10 cm away. How many seconds does the whole trip take?
  38. 38.🛑 A robot is 90 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?
  39. 39.🛑 A robot is 100 cm from a wall. It drives at 25 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?
  40. 40.🛑 A robot needs 45 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)?

Answer key

  1. 8
  2. 9
  3. longer
  4. 11
  5. it keeps moving a bit
  6. 15
  7. to react in time
  8. 12
  9. 4
  10. before it is too close
  11. 4
  12. 40
  13. 4
  14. 3
  15. 110
  16. 25
  17. 23
  18. 20
  19. 55
  20. 65
  21. 35
  22. 4
  23. 4
  24. 25
  25. 2
  26. 6
  27. 80
  28. 11
  29. 16
  30. 7.5
  31. 12
  32. 35
  33. 10
  34. 3
  35. 3
  36. 5
  37. 11
  38. 3
  39. 5
  40. 45

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