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Robotics Worksheet: Stopping Distance

Robotics lesson 27: Stopping in time · Set 99 · 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 50 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?
  2. 2.🛑 When should a robot start slowing down? (a) never (b) only when it is off (c) after hitting the wall (d) before it is too close
  3. 3.🛑 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)? =
  4. 4.🛑 A robot is 260 cm from a wall. It drives at 40 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?
  5. 5.🛑 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?
  6. 6.🛑 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
  7. 7.🛑 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?
  8. 8.🛑 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?
  9. 9.🛑 A robot is 120 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?
  10. 10.🛑 Why can a moving robot not stop instantly? (a) it keeps moving a bit (b) brakes are magic (c) it is too light (d) it likes to slide
  11. 11.🛑 A robot needs 5 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 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?
  13. 13.🛑 A robot needs 5 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)?
  14. 14.🛑 A robot is 110 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?
  15. 15.🛑 A robot is 100 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 20 cm away. How many seconds does the whole trip take?
  16. 16.🛑 A faster robot needs a … distance to stop. (a) shorter (b) longer (c) zero (d) negative
  17. 17.🛑 A robot needs 10 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)?
  18. 18.🛑 A robot is 60 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?
  19. 19.🛑 A robot is 175 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?
  20. 20.🛑 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)?
  21. 21.🛑 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?
  22. 22.🛑 A robot is 210 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?
  23. 23.🛑 A robot is 120 cm from a wall. It drives at 30 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?
  24. 24.🛑 A robot is 250 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?
  25. 25.🛑 A robot is 80 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?
  26. 26.🛑 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 10 cm away. How many seconds does the whole trip take?
  27. 27.🛑 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)? =
  28. 28.🛑 A robot is 180 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?
  29. 29.🛑 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)? =
  30. 30.🛑 A robot is 40 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?
  31. 31.🛑 A robot is 65 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 is 140 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?
  33. 33.🛑 A robot is 380 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?
  34. 34.🛑 A robot is 90 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?
  35. 35.🛑 A robot is 70 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?
  36. 36.🛑 A robot needs 10 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)?
  37. 37.🛑 A robot is 170 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?
  38. 38.🛑 A robot is 220 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 20 cm away. How many seconds does the whole trip take?
  39. 39.🛑 A robot is 150 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?
  40. 40.🛑 A robot is 210 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?

Answer key

  1. 6
  2. before it is too close
  3. 12.5
  4. 9
  5. 7
  6. to react in time
  7. 4
  8. 11
  9. 9
  10. it keeps moving a bit
  11. 45
  12. 7
  13. 55
  14. 6
  15. 8
  16. longer
  17. 90
  18. 5
  19. 21
  20. 25
  21. 4
  22. 13
  23. 12
  24. 15
  25. 4
  26. 7
  27. 10
  28. 12
  29. 10
  30. 4
  31. 7
  32. 6
  33. 25
  34. 7
  35. 12
  36. 110
  37. 7
  38. 11
  39. 8
  40. 12

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