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Robotics Worksheet: Stopping Distance

Robotics lesson 27: Stopping in time · Set 143 · 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 50 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)?
  2. 2.🛑 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?
  3. 3.🛑 A robot is 110 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?
  4. 4.🛑 A robot is 80 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 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)?
  6. 6.🛑 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?
  7. 7.🛑 A robot is 70 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?
  8. 8.🛑 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)? =
  9. 9.🛑 A robot is 210 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 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)?
  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 is 90 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?
  13. 13.🛑 Why can a moving robot not stop instantly? (a) brakes are magic (b) it keeps moving a bit (c) it likes to slide (d) it is too light
  14. 14.🛑 A robot is 70 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?
  15. 15.🛑 A robot is 40 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?
  16. 16.🛑 A robot needs 110 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)?
  17. 17.🛑 A robot is 125 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?
  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.🛑 A robot is 260 cm from a wall. It drives at 40 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?
  20. 20.🛑 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)? =
  21. 21.🛑 A robot is 120 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?
  22. 22.🛑 A robot needs 25 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)?
  23. 23.🛑 A robot is 80 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?
  24. 24.🛑 A robot is 220 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 10 cm away. How many seconds does the whole trip take?
  25. 25.🛑 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)? =
  26. 26.🛑 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?
  27. 27.🛑 A robot needs 55 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)?
  28. 28.🛑 A robot is 80 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?
  29. 29.🛑 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?
  30. 30.🛑 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)? =
  31. 31.🛑 A robot needs 20 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)?
  32. 32.🛑 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
  33. 33.🛑 A robot is 135 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?
  34. 34.🛑 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)?
  35. 35.🛑 A faster robot needs a … distance to stop. (a) zero (b) longer (c) negative (d) shorter
  36. 36.🛑 A robot is 60 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?
  37. 37.🛑 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?
  38. 38.🛑 A robot is 95 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?
  39. 39.🛑 A robot is 150 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?
  40. 40.🛑 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)? =

Answer key

  1. 60
  2. 3
  3. 9
  4. 5
  5. 145
  6. 3
  7. 4
  8. 20
  9. 9
  10. 5
  11. 12
  12. 6
  13. it keeps moving a bit
  14. 4
  15. 2
  16. 20
  17. 11
  18. 3
  19. 13
  20. 2
  21. 5
  22. 75
  23. 7
  24. 24
  25. 1
  26. 8
  27. 25
  28. 10
  29. 7
  30. 10
  31. 30
  32. before it is too close
  33. 7
  34. 100
  35. longer
  36. 8
  37. 7
  38. 5
  39. 6
  40. 7.5

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