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Robotics Worksheet: Stopping Distance

Robotics lesson 27: Stopping in time · Set 44 · 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 faster robot needs a … distance to stop. (a) shorter (b) longer (c) zero (d) negative
  2. 2.🛑 A robot is 70 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?
  3. 3.🛑 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)? =
  4. 4.🛑 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)? =
  5. 5.🛑 Why can a moving robot not stop instantly? (a) it keeps moving a bit (b) it likes to slide (c) brakes are magic (d) it is too light
  6. 6.🛑 A robot needs 40 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)?
  7. 7.🛑 A robot needs 60 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)?
  8. 8.🛑 A robot is 250 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 20 cm away. How many seconds does the whole trip take?
  9. 9.🛑 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)? =
  10. 10.🛑 A robot is 45 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?
  11. 11.🛑 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?
  12. 12.🛑 A robot needs 110 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)?
  13. 13.🛑 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 20 cm away. How many seconds does the whole trip take?
  14. 14.🛑 A robot needs 35 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)?
  15. 15.🛑 A robot needs 25 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)?
  16. 16.🛑 A robot needs 25 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 needs 80 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)?
  18. 18.🛑 When should a robot start slowing down? (a) after hitting the wall (b) never (c) only when it is off (d) before it is too close
  19. 19.🛑 A robot is 200 cm from a wall. It drives at 50 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?
  20. 20.🛑 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?
  21. 21.🛑 A robot is 310 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?
  22. 22.🛑 A robot is 40 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 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 10 cm away. How many seconds does the whole trip take?
  24. 24.🛑 A robot needs 5 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)?
  25. 25.🛑 A robot needs 15 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)?
  26. 26.🛑 Why do robots check their sensors many times a second? (a) to waste battery (b) to feel tired (c) to look busy (d) to react in time
  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 35 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?
  29. 29.🛑 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?
  30. 30.🛑 A robot is 170 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 20 cm away. How many seconds does the whole trip take?
  31. 31.🛑 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)? =
  32. 32.🛑 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)? =
  33. 33.🛑 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?
  34. 34.🛑 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)?
  35. 35.🛑 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?
  36. 36.🛑 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)?
  37. 37.🛑 A robot is 80 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?
  38. 38.🛑 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)? =
  39. 39.🛑 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)? =
  40. 40.🛑 A robot is 55 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. longer
  2. 8
  3. 15
  4. 3
  5. it keeps moving a bit
  6. 110
  7. 10
  8. 22
  9. 2
  10. 7
  11. 9
  12. 10
  13. 11
  14. 5
  15. 95
  16. 15
  17. 30
  18. before it is too close
  19. 10
  20. 3
  21. 25
  22. 2
  23. 6
  24. 85
  25. 45
  26. to react in time
  27. 4
  28. 5
  29. 5
  30. 6
  31. 12.5
  32. 5
  33. 8
  34. 60
  35. 5
  36. 60
  37. 12
  38. 1
  39. 8
  40. 9

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