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Robotics Worksheet: Stopping Distance

Robotics lesson 27: Stopping in time · Set 56 · 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 360 cm from a wall. It drives at 40 cm per second until it is 80 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?
  2. 2.🛑 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)? =
  3. 3.🛑 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)?
  4. 4.🛑 A robot moves 10 cm every second and checks its distance sensor every 200 ms. How far does it move between two checks (in cm)? =
  5. 5.🛑 A robot is 160 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 10 cm away. How many seconds does the whole trip take?
  6. 6.🛑 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?
  7. 7.🛑 A robot is 170 cm from a wall. It drives at 30 cm per second until it is 80 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?
  8. 8.🛑 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)? =
  9. 9.🛑 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)?
  10. 10.🛑 A robot needs 45 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 is 180 cm from a wall. It drives at 20 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?
  12. 12.🛑 A robot is 80 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?
  13. 13.🛑 When should a robot start slowing down? (a) only when it is off (b) after hitting the wall (c) before it is too close (d) never
  14. 14.🛑 Why do robots check their sensors many times a second? (a) to feel tired (b) to waste battery (c) to react in time (d) to look busy
  15. 15.🛑 A robot needs 60 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)?
  16. 16.🛑 A robot is 100 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 10 cm away. How many seconds does the whole trip take?
  17. 17.🛑 A robot moves 50 cm every second and checks its distance sensor every 500 ms. How far does it move between two checks (in cm)? =
  18. 18.🛑 A faster robot needs a … distance to stop. (a) shorter (b) longer (c) zero (d) negative
  19. 19.🛑 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?
  20. 20.🛑 A robot is 200 cm from a wall. It drives at 20 cm per second until it is 80 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?
  21. 21.🛑 A robot is 70 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?
  22. 22.🛑 A robot is 200 cm from a wall. It drives at 40 cm per second until it is 80 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?
  23. 23.🛑 A robot is 50 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 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?
  25. 25.🛑 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?
  26. 26.🛑 Why can a moving robot not stop instantly? (a) brakes are magic (b) it likes to slide (c) it keeps moving a bit (d) it is too light
  27. 27.🛑 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?
  28. 28.🛑 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)? =
  29. 29.🛑 A robot needs 20 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)?
  30. 30.🛑 A robot needs 40 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)?
  31. 31.🛑 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?
  32. 32.🛑 A robot needs 80 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)?
  33. 33.🛑 A robot is 235 cm from a wall. It drives at 25 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 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)?
  35. 35.🛑 A robot is 200 cm from a wall. It drives at 50 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?
  36. 36.🛑 A robot is 225 cm from a wall. It drives at 25 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?
  37. 37.🛑 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)?
  38. 38.🛑 A robot is 210 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?
  39. 39.🛑 A robot needs 5 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)?
  40. 40.🛑 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?

Answer key

  1. 19
  2. 10
  3. 25
  4. 2
  5. 10
  6. 2
  7. 15
  8. 3
  9. 85
  10. 5
  11. 12
  12. 6
  13. before it is too close
  14. to react in time
  15. 70
  16. 7
  17. 25
  18. longer
  19. 11
  20. 13
  21. 5
  22. 15
  23. 4
  24. 5
  25. 10
  26. it keeps moving a bit
  27. 11
  28. 10
  29. 90
  30. 10
  31. 2
  32. 60
  33. 17
  34. 25
  35. 18
  36. 14
  37. 95
  38. 11
  39. 135
  40. 2

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