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Robotics Worksheet: Ultrasonic Distance Sensor

Robotics lesson 17: The distance sensor · Set 223 · 40 questions
TalentJR

Robot tip (Half the echo path): Distance (cm) = 17 × echo time (ms), because 34 cm per ms ÷ 2 for there and back. Echo time (ms) = distance × 2 ÷ 34. Distance after driving = distance now − speed × time.

NameDateTime takenScore ___ / 40
  1. 1.📡 An object is 17 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
  2. 2.📡 What does an ultrasonic distance sensor send out? (a) sound too high to hear (b) water drops (c) bright light (d) radio music
  3. 3.📡 A robot is 200 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 2 seconds (in cm)?
  4. 4.📡 A distance sensor sends a sound pulse and hears the echo 10 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
  5. 5.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
  6. 6.📡 An object is 306 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
  7. 7.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 5 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
  8. 8.📡 A robot is 160 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 3 seconds (in cm)?
  9. 9.📡 A distance sensor sends a sound pulse and hears the echo 4 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
  10. 10.📡 A distance sensor sends a sound pulse and hears the echo 3 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
  11. 11.📡 An object is 34 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
  12. 12.📡 An object is 340 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
  13. 13.📡 A distance sensor sends a sound pulse and hears the echo 2 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
  14. 14.📡 A distance sensor sends a sound pulse and hears the echo 8 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
  15. 15.📡 An object is 187 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
  16. 16.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
  17. 17.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
  18. 18.📡 An object is 323 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
  19. 19.📡 Which object is hardest for an echo sensor to notice? (a) a flat wall (b) a metal door (c) a wooden box (d) a soft foam cushion
  20. 20.📡 An object is 119 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
  21. 21.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
  22. 22.📡 An object is 272 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
  23. 23.📡 A robot is 260 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 6 seconds (in cm)?
  24. 24.📡 A distance sensor sends a sound pulse and hears the echo 5 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
  25. 25.📡 A robot is 150 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 2 seconds (in cm)?
  26. 26.📡 A robot is 190 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 12 seconds (in cm)?
  27. 27.📡 An object is 289 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
  28. 28.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 1 km (b) 34 cm (c) 3 cm (d) 340 cm
  29. 29.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
  30. 30.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
  31. 31.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
  32. 32.📡 A robot is 170 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 2 seconds (in cm)?
  33. 33.📡 A robot is 170 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 8 seconds (in cm)?
  34. 34.📡 A robot is 300 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 7 seconds (in cm)?
  35. 35.📡 A robot is 150 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 4 seconds (in cm)?
  36. 36.📡 An object is 102 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
  37. 37.📡 A robot is 220 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 15 seconds (in cm)?
  38. 38.📡 A robot is 190 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 10 seconds (in cm)?
  39. 39.📡 A robot is 300 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 13 seconds (in cm)?
  40. 40.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No

Answer key

  1. 1
  2. sound too high to hear
  3. 170
  4. 170
  5. No
  6. 18
  7. No
  8. 130
  9. 68
  10. 51
  11. 2
  12. 20
  13. 34
  14. 136
  15. 11
  16. Yes
  17. No
  18. 19
  19. a soft foam cushion
  20. 7
  21. No
  22. 16
  23. 200
  24. 85
  25. 110
  26. 10
  27. 17
  28. 34 cm
  29. Yes
  30. Yes
  31. Yes
  32. 130
  33. 10
  34. 230
  35. 90
  36. 6
  37. 70
  38. 90
  39. 105
  40. No

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