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Robotics Worksheet: Stopping Distance

Robotics lesson 27: Stopping in time · Set 49 · 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 55 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?
  2. 2.🛑 A faster robot needs a … distance to stop. (a) zero (b) negative (c) shorter (d) longer
  3. 3.🛑 When should a robot start slowing down? (a) only when it is off (b) before it is too close (c) never (d) after hitting the wall
  4. 4.🛑 A robot needs 35 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)?
  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 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)?
  7. 7.🛑 A robot is 410 cm from a wall. It drives at 50 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?
  8. 8.🛑 Why can a moving robot not stop instantly? (a) it likes to slide (b) it is too light (c) brakes are magic (d) it keeps moving a bit
  9. 9.🛑 A robot is 160 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?
  10. 10.🛑 A robot needs 25 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)?
  11. 11.🛑 A robot needs 5 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)?
  12. 12.🛑 A robot needs 90 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)?
  13. 13.🛑 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 10 cm away. How many seconds does the whole trip take?
  14. 14.🛑 A robot moves 30 cm every second and checks its distance sensor every 200 ms. How far does it move between two checks (in cm)? =
  15. 15.🛑 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?
  16. 16.🛑 A robot is 75 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?
  17. 17.🛑 A robot is 125 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?
  18. 18.🛑 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)?
  19. 19.🛑 A robot is 130 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?
  20. 20.🛑 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?
  21. 21.🛑 A robot is 165 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?
  22. 22.🛑 A robot is 70 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?
  23. 23.🛑 A robot is 280 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 10 cm away. How many seconds does the whole trip take?
  24. 24.🛑 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?
  25. 25.🛑 A robot needs 30 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)?
  26. 26.🛑 A robot is 260 cm from a wall. It drives at 40 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?
  27. 27.🛑 Why do robots check their sensors many times a second? (a) to look busy (b) to waste battery (c) to react in time (d) to feel tired
  28. 28.🛑 A robot is 130 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 10 cm away. How many seconds does the whole trip take?
  29. 29.🛑 A robot is 35 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?
  30. 30.🛑 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)?
  31. 31.🛑 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?
  32. 32.🛑 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)? =
  33. 33.🛑 A robot is 40 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?
  34. 34.🛑 A robot is 360 cm from a wall. It drives at 40 cm per second until it is 80 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?
  35. 35.🛑 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)? =
  36. 36.🛑 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?
  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 needs 30 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)?
  39. 39.🛑 A robot is 100 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?
  40. 40.🛑 A robot is 60 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?

Answer key

  1. 3
  2. longer
  3. before it is too close
  4. 85
  5. 2
  6. 120
  7. 12
  8. it keeps moving a bit
  9. 10
  10. 25
  11. 125
  12. 10
  13. 25
  14. 6
  15. 22
  16. 3
  17. 7
  18. 110
  19. 8
  20. 4
  21. 9
  22. 2
  23. 24
  24. 6
  25. 20
  26. 22
  27. to react in time
  28. 8
  29. 3
  30. 20
  31. 3
  32. 1
  33. 3
  34. 13
  35. 4
  36. 12
  37. 60
  38. 90
  39. 7
  40. 10

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