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Robotics Worksheet: Stopping Distance

Robotics lesson 27: Stopping in time · Set 150 · 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 130 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?
  2. 2.🛑 A robot is 190 cm from a wall. It drives at 30 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?
  3. 3.🛑 A faster robot needs a … distance to stop. (a) negative (b) shorter (c) zero (d) longer
  4. 4.🛑 A robot is 300 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 50 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?
  6. 6.🛑 When should a robot start slowing down? (a) after hitting the wall (b) before it is too close (c) only when it is off (d) never
  7. 7.🛑 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)?
  8. 8.🛑 Why do robots check their sensors many times a second? (a) to look busy (b) to feel tired (c) to react in time (d) to waste battery
  9. 9.🛑 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)? =
  10. 10.🛑 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?
  11. 11.🛑 A robot is 260 cm from a wall. It drives at 40 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?
  12. 12.🛑 A robot is 140 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?
  13. 13.🛑 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?
  14. 14.🛑 A robot needs 25 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)?
  15. 15.🛑 A robot is 65 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?
  16. 16.🛑 A robot is 230 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?
  17. 17.🛑 A robot is 110 cm from a wall. It drives at 25 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?
  18. 18.🛑 A robot is 180 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?
  19. 19.🛑 Why can a moving robot not stop instantly? (a) it keeps moving a bit (b) it likes to slide (c) it is too light (d) brakes are magic
  20. 20.🛑 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?
  21. 21.🛑 A robot needs 65 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)?
  22. 22.🛑 A robot needs 50 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)?
  23. 23.🛑 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)?
  24. 24.🛑 A robot is 400 cm from a wall. It drives at 50 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?
  25. 25.🛑 A robot needs 15 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)?
  26. 26.🛑 A robot is 150 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?
  27. 27.🛑 A robot needs 95 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)?
  28. 28.🛑 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)? =
  29. 29.🛑 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)? =
  30. 30.🛑 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)?
  31. 31.🛑 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?
  32. 32.🛑 A robot is 200 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 10 cm away. How many seconds does the whole trip take?
  33. 33.🛑 A robot is 200 cm from a wall. It drives at 50 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?
  34. 34.🛑 A robot needs 50 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)?
  35. 35.🛑 A robot is 230 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 10 cm away. How many seconds does the whole trip take?
  36. 36.🛑 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?
  37. 37.🛑 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)? =
  38. 38.🛑 A robot needs 30 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)?
  39. 39.🛑 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?
  40. 40.🛑 A robot is 300 cm from a wall. It drives at 50 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?

Answer key

  1. 5
  2. 11
  3. longer
  4. 10
  5. 4
  6. before it is too close
  7. 5
  8. to react in time
  9. 3
  10. 8
  11. 13
  12. 17
  13. 7
  14. 45
  15. 3
  16. 10
  17. 6
  18. 10
  19. it keeps moving a bit
  20. 5
  21. 25
  22. 50
  23. 25
  24. 13
  25. 105
  26. 7
  27. 5
  28. 10
  29. 2
  30. 60
  31. 8
  32. 14
  33. 9
  34. 10
  35. 10
  36. 11
  37. 1
  38. 40
  39. 10
  40. 9

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