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Robotics Worksheet: Stopping Distance

Robotics lesson 27: Stopping in time · Set 179 · 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 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?
  2. 2.🛑 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)? =
  3. 3.🛑 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)? =
  4. 4.🛑 A robot is 110 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?
  5. 5.🛑 A robot is 55 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?
  6. 6.🛑 A robot is 420 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 20 cm away. How many seconds does the whole trip take?
  7. 7.🛑 A robot is 110 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?
  8. 8.🛑 A robot needs 5 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)?
  9. 9.🛑 Why can a moving robot not stop instantly? (a) brakes are magic (b) it keeps moving a bit (c) it is too light (d) it likes to slide
  10. 10.🛑 A faster robot needs a … distance to stop. (a) zero (b) longer (c) negative (d) shorter
  11. 11.🛑 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
  12. 12.🛑 A robot is 50 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?
  13. 13.🛑 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?
  14. 14.🛑 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)? =
  15. 15.🛑 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)? =
  16. 16.🛑 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)? =
  17. 17.🛑 A robot is 85 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?
  18. 18.🛑 A robot is 260 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 10 cm away. How many seconds does the whole trip take?
  19. 19.🛑 A robot needs 80 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)?
  20. 20.🛑 A robot is 300 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 20 cm away. How many seconds does the whole trip take?
  21. 21.🛑 A robot is 210 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?
  22. 22.🛑 A robot is 130 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 320 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 10 cm away. How many seconds does the whole trip take?
  24. 24.🛑 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)? =
  25. 25.🛑 A robot is 70 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.🛑 A robot is 280 cm from a wall. It drives at 50 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?
  27. 27.🛑 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)?
  28. 28.🛑 A robot is 75 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?
  29. 29.🛑 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)?
  30. 30.🛑 A robot is 45 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 50 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?
  32. 32.🛑 A robot is 190 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?
  33. 33.🛑 A robot is 190 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?
  34. 34.🛑 A robot is 55 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?
  35. 35.🛑 A robot is 400 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 200 cm from a wall. It drives at 30 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?
  37. 37.🛑 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)? =
  38. 38.🛑 A robot is 190 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?
  39. 39.🛑 A robot is 90 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 moves 40 cm every second and checks its distance sensor every 250 ms. How far does it move between two checks (in cm)? =

Answer key

  1. 11
  2. 15
  3. 10
  4. 9
  5. 7
  6. 24
  7. 5
  8. 65
  9. it keeps moving a bit
  10. longer
  11. before it is too close
  12. 2
  13. 6
  14. 8
  15. 4
  16. 5
  17. 5
  18. 20
  19. 20
  20. 16
  21. 9
  22. 5
  23. 20
  24. 25
  25. 3
  26. 10
  27. 30
  28. 11
  29. 10
  30. 5
  31. 8
  32. 9
  33. 12
  34. 5
  35. 22
  36. 10
  37. 4
  38. 19
  39. 6
  40. 10

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