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Robotics Worksheet: Stopping Distance

Robotics lesson 27: Stopping in time · Set 15 · 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 moves 40 cm every second and checks its distance sensor every 250 ms. How far does it move between two checks (in cm)? =
  2. 2.🛑 A robot is 250 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?
  3. 3.🛑 A faster robot needs a … distance to stop. (a) zero (b) negative (c) longer (d) shorter
  4. 4.🛑 A robot is 120 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?
  5. 5.🛑 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)? =
  6. 6.🛑 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)? =
  7. 7.🛑 A robot is 300 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?
  8. 8.🛑 A robot moves 40 cm every second and checks its distance sensor every 200 ms. How far does it move between two checks (in cm)? =
  9. 9.🛑 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)? =
  10. 10.🛑 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)? =
  11. 11.🛑 When should a robot start slowing down? (a) only when it is off (b) after hitting the wall (c) never (d) before it is too close
  12. 12.🛑 A robot is 270 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?
  13. 13.🛑 Why do robots check their sensors many times a second? (a) to react in time (b) to feel tired (c) to look busy (d) to waste battery
  14. 14.🛑 A robot is 65 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 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?
  16. 16.🛑 A robot needs 30 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)?
  17. 17.🛑 Why can a moving robot not stop instantly? (a) it is too light (b) it likes to slide (c) it keeps moving a bit (d) brakes are magic
  18. 18.🛑 A robot is 195 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?
  19. 19.🛑 A robot is 30 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?
  20. 20.🛑 A robot needs 10 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)?
  21. 21.🛑 A robot needs 70 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)?
  22. 22.🛑 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?
  23. 23.🛑 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 20 cm away. How many seconds does the whole trip take?
  24. 24.🛑 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)?
  25. 25.🛑 A robot needs 10 cm to stop once it brakes. It starts braking when its sensor sees a wall 120 cm away. How far from the wall does it stop (in cm)?
  26. 26.🛑 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?
  27. 27.🛑 A robot moves 20 cm every second and checks its distance sensor every 200 ms. How far does it move between two checks (in cm)? =
  28. 28.🛑 A robot is 45 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?
  29. 29.🛑 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)? =
  30. 30.🛑 A robot is 160 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?
  31. 31.🛑 A robot is 140 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?
  32. 32.🛑 A robot is 300 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?
  33. 33.🛑 A robot is 60 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?
  34. 34.🛑 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)?
  35. 35.🛑 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)? =
  36. 36.🛑 A robot needs 10 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)?
  37. 37.🛑 A robot needs 10 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)?
  38. 38.🛑 A robot is 20 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?
  39. 39.🛑 A robot needs 10 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 needs 50 cm to stop once it brakes. It starts braking when its sensor sees a wall 120 cm away. How far from the wall does it stop (in cm)?

Answer key

  1. 10
  2. 13
  3. longer
  4. 9
  5. 2
  6. 5
  7. 13
  8. 8
  9. 10
  10. 4
  11. before it is too close
  12. 17
  13. to react in time
  14. 11
  15. 8
  16. 40
  17. it keeps moving a bit
  18. 11
  19. 4
  20. 70
  21. 70
  22. 4
  23. 10
  24. 40
  25. 110
  26. 12
  27. 4
  28. 5
  29. 10
  30. 18
  31. 8
  32. 14
  33. 2
  34. 140
  35. 12.5
  36. 50
  37. 60
  38. 2
  39. 100
  40. 70

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