← Stopping in time lesson New set →

Robotics Worksheet: Stopping Distance

Robotics lesson 27: Stopping in time · Set 171 · 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 180 cm from a wall. It drives at 50 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.🛑 When should a robot start slowing down? (a) never (b) before it is too close (c) only when it is off (d) after hitting the wall
  3. 3.🛑 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)? =
  4. 4.🛑 A robot needs 20 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)?
  5. 5.🛑 Why do robots check their sensors many times a second? (a) to feel tired (b) to react in time (c) to waste battery (d) to look busy
  6. 6.🛑 A robot is 45 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?
  7. 7.🛑 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)? =
  8. 8.🛑 A faster robot needs a … distance to stop. (a) shorter (b) longer (c) zero (d) negative
  9. 9.🛑 A robot is 220 cm from a wall. It drives at 20 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?
  10. 10.🛑 A robot is 130 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?
  11. 11.🛑 A robot needs 10 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)?
  12. 12.🛑 A robot moves 10 cm every second and checks its distance sensor every 250 ms. How far does it move between two checks (in cm)? =
  13. 13.🛑 A robot needs 115 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)?
  14. 14.🛑 A robot is 150 cm from a wall. It drives at 20 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?
  15. 15.🛑 A robot needs 40 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)?
  16. 16.🛑 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)? =
  17. 17.🛑 A robot needs 85 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)?
  18. 18.🛑 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)? =
  19. 19.🛑 A robot is 250 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?
  20. 20.🛑 A robot is 45 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?
  21. 21.🛑 A robot needs 80 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)?
  22. 22.🛑 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?
  23. 23.🛑 A robot is 370 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?
  24. 24.🛑 A robot needs 25 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)?
  25. 25.🛑 A robot is 330 cm from a wall. It drives at 50 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?
  26. 26.🛑 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)? =
  27. 27.🛑 A robot is 220 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?
  28. 28.🛑 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)? =
  29. 29.🛑 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?
  30. 30.🛑 A robot is 80 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?
  31. 31.🛑 A robot needs 75 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)?
  32. 32.🛑 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?
  33. 33.🛑 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?
  34. 34.🛑 A robot needs 55 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)?
  35. 35.🛑 A robot is 185 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?
  36. 36.🛑 A robot is 205 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 10 cm away. How many seconds does the whole trip take?
  37. 37.🛑 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)? =
  38. 38.🛑 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 20 cm away. How many seconds does the whole trip take?
  39. 39.🛑 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
  40. 40.🛑 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?

Answer key

  1. 14
  2. before it is too close
  3. 25
  4. 100
  5. to react in time
  6. 7
  7. 10
  8. longer
  9. 18
  10. 6
  11. 30
  12. 2.5
  13. 25
  14. 11
  15. 70
  16. 12.5
  17. 45
  18. 3
  19. 16
  20. 3
  21. 50
  22. 4
  23. 12
  24. 125
  25. 19
  26. 10
  27. 21
  28. 7.5
  29. 5
  30. 10
  31. 15
  32. 9
  33. 10
  34. 65
  35. 11
  36. 19
  37. 2
  38. 14
  39. it keeps moving a bit
  40. 11

Free robotics lessons, practice and worksheets at talentjr.in/robotics-for-kids