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Robotics Worksheet: Stopping Distance

Robotics lesson 27: Stopping in time · Set 789 · 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.🛑 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
  2. 2.🛑 A robot needs 25 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)?
  3. 3.🛑 A robot is 250 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?
  4. 4.🛑 A robot is 45 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?
  5. 5.🛑 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?
  6. 6.🛑 A robot needs 65 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)?
  7. 7.🛑 A robot needs 20 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)?
  8. 8.🛑 A robot needs 55 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)?
  9. 9.🛑 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)?
  10. 10.🛑 A robot is 170 cm from a wall. It drives at 30 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?
  11. 11.🛑 A robot needs 15 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)?
  12. 12.🛑 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)? =
  13. 13.🛑 Why do robots check their sensors many times a second? (a) to look busy (b) to react in time (c) to waste battery (d) to feel tired
  14. 14.🛑 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
  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 60 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)?
  17. 17.🛑 A robot is 160 cm from a wall. It drives at 50 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?
  18. 18.🛑 A robot is 110 cm from a wall. It drives at 20 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?
  19. 19.🛑 A faster robot needs a … distance to stop. (a) zero (b) longer (c) negative (d) shorter
  20. 20.🛑 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)? =
  21. 21.🛑 A robot is 340 cm from a wall. It drives at 30 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?
  22. 22.🛑 A robot needs 35 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)?
  23. 23.🛑 A robot needs 45 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)?
  24. 24.🛑 A robot is 290 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?
  25. 25.🛑 A robot is 90 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?
  26. 26.🛑 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?
  27. 27.🛑 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?
  28. 28.🛑 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)? =
  29. 29.🛑 A robot is 60 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?
  30. 30.🛑 A robot is 100 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?
  31. 31.🛑 A robot needs 60 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)?
  32. 32.🛑 A robot needs 80 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)?
  33. 33.🛑 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 10 cm away. How many seconds does the whole trip take?
  34. 34.🛑 A robot is 275 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 10 cm away. How many seconds does the whole trip take?
  35. 35.🛑 A robot is 30 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?
  36. 36.🛑 A robot needs 15 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)?
  37. 37.🛑 A robot is 360 cm from a wall. It drives at 50 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?
  38. 38.🛑 A robot is 190 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 50 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?
  40. 40.🛑 A robot is 80 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?

Answer key

  1. before it is too close
  2. 45
  3. 11
  4. 3
  5. 7
  6. 5
  7. 70
  8. 85
  9. 95
  10. 8
  11. 35
  12. 15
  13. to react in time
  14. it keeps moving a bit
  15. 2
  16. 30
  17. 10
  18. 6
  19. longer
  20. 10
  21. 24
  22. 95
  23. 55
  24. 14
  25. 8
  26. 6
  27. 10
  28. 3
  29. 6
  30. 9
  31. 60
  32. 10
  33. 13
  34. 25
  35. 2
  36. 85
  37. 16
  38. 8
  39. 2
  40. 3

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