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Robotics Worksheet: Stopping Distance

Robotics lesson 27: Stopping in time · Set 641 · 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 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?
  2. 2.🛑 A robot is 110 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?
  3. 3.🛑 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)? =
  4. 4.🛑 A robot is 200 cm from a wall. It drives at 20 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?
  5. 5.🛑 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?
  6. 6.🛑 When should a robot start slowing down? (a) never (b) only when it is off (c) before it is too close (d) after hitting the wall
  7. 7.🛑 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?
  8. 8.🛑 Why do robots check their sensors many times a second? (a) to look busy (b) to react in time (c) to feel tired (d) to waste battery
  9. 9.🛑 A robot moves 30 cm every second and checks its distance sensor every 200 ms. How far does it move between two checks (in cm)? =
  10. 10.🛑 A robot is 130 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?
  11. 11.🛑 A robot is 170 cm from a wall. It drives at 40 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?
  12. 12.🛑 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)?
  13. 13.🛑 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?
  14. 14.🛑 A robot needs 10 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)?
  15. 15.🛑 Why can a moving robot not stop instantly? (a) it is too light (b) it keeps moving a bit (c) it likes to slide (d) brakes are magic
  16. 16.🛑 A robot is 260 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?
  17. 17.🛑 A robot is 270 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?
  18. 18.🛑 A robot is 70 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 needs 100 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)?
  20. 20.🛑 A robot needs 55 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)?
  21. 21.🛑 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)? =
  22. 22.🛑 A robot needs 10 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)?
  23. 23.🛑 A robot needs 20 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)?
  24. 24.🛑 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)? =
  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.🛑 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?
  27. 27.🛑 A robot is 230 cm from a wall. It drives at 25 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?
  28. 28.🛑 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)? =
  29. 29.🛑 A robot is 65 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?
  30. 30.🛑 A robot is 260 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?
  31. 31.🛑 A robot is 50 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?
  32. 32.🛑 A robot moves 30 cm every second and checks its distance sensor every 250 ms. How far does it move between two checks (in cm)? =
  33. 33.🛑 A robot is 30 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 faster robot needs a … distance to stop. (a) negative (b) zero (c) longer (d) shorter
  35. 35.🛑 A robot needs 80 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)?
  36. 36.🛑 A robot is 170 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?
  37. 37.🛑 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)?
  38. 38.🛑 A robot needs 40 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 moves 10 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 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. 3
  2. 10
  3. 3
  4. 21
  5. 2
  6. before it is too close
  7. 5
  8. to react in time
  9. 6
  10. 10
  11. 9
  12. 20
  13. 5
  14. 50
  15. it keeps moving a bit
  16. 12
  17. 12
  18. 6
  19. 50
  20. 95
  21. 5
  22. 40
  23. 70
  24. 10
  25. 45
  26. 19
  27. 18
  28. 8
  29. 9
  30. 18
  31. 3
  32. 7.5
  33. 2
  34. longer
  35. 10
  36. 10
  37. 5
  38. 30
  39. 2
  40. 2

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