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Robotics Worksheet: Ultrasonic Distance Sensor

Robotics lesson 17: The distance sensor · Set 4 · 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.📡 A distance sensor sends a sound pulse and hears the echo 19 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
  2. 2.📡 A robot is 150 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 5 seconds (in cm)?
  3. 3.📡 Why do we halve the echo’s total path? (a) the sensor is half (b) sound is slow (c) to make it smaller (d) it goes there and back
  4. 4.📡 A distance sensor sends a sound pulse and hears the echo 12 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
  5. 5.📡 A robot is 150 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 11 seconds (in cm)?
  6. 6.📡 An object is 238 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
  7. 7.📡 A distance sensor sends a sound pulse and hears the echo 11 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
  8. 8.📡 A distance sensor sends a sound pulse and hears the echo 20 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
  9. 9.📡 A robot is 250 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 5 seconds (in cm)?
  10. 10.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
  11. 11.📡 A robot is 130 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)?
  12. 12.📡 A robot is 250 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 21 seconds (in cm)?
  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 6 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
  15. 15.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
  16. 16.📡 A distance sensor sends a sound pulse and hears the echo 15 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
  17. 17.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
  18. 18.📡 What does an ultrasonic distance sensor send out? (a) radio music (b) sound too high to hear (c) water drops (d) bright light
  19. 19.📡 A distance sensor sends a sound pulse and hears the echo 9 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
  20. 20.📡 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)?
  21. 21.📡 A distance sensor sends a sound pulse and hears the echo 14 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
  22. 22.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
  23. 23.📡 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?
  24. 24.📡 A robot is 170 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 25 seconds (in cm)?
  25. 25.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
  26. 26.📡 A robot is 240 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 9 seconds (in cm)?
  27. 27.📡 An object is 170 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
  28. 28.📡 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?
  29. 29.📡 A distance sensor sends a sound pulse and hears the echo 13 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
  30. 30.📡 A robot is 160 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 9 seconds (in cm)?
  31. 31.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
  32. 32.📡 An object is 68 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
  33. 33.📡 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?
  34. 34.📡 An object is 255 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
  35. 35.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 1 km (b) 340 cm (c) 3 cm (d) 34 cm
  36. 36.📡 A robot is 210 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)?
  37. 37.📡 A distance sensor sends a sound pulse and hears the echo 16 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
  38. 38.📡 An object is 136 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
  39. 39.📡 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?
  40. 40.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes

Answer key

  1. 323
  2. 125
  3. it goes there and back
  4. 204
  5. 40
  6. 14
  7. 187
  8. 340
  9. 150
  10. No
  11. 90
  12. 40
  13. 34
  14. 102
  15. No
  16. 255
  17. No
  18. sound too high to hear
  19. 153
  20. 136
  21. 238
  22. No
  23. 16
  24. 45
  25. No
  26. 105
  27. 10
  28. 7
  29. 221
  30. 25
  31. Yes
  32. 4
  33. 6
  34. 15
  35. 34 cm
  36. 15
  37. 272
  38. 8
  39. 17
  40. Yes

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