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Robotics Worksheet: Ultrasonic Distance Sensor

Robotics lesson 17: The distance sensor · Set 698 · 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.📡 Why do we halve the echo’s total path? (a) the sensor is half (b) sound is slow (c) it goes there and back (d) to make it smaller
  2. 2.📡 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)?
  3. 3.📡 A robot is 230 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 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
  5. 5.📡 What does an ultrasonic distance sensor send out? (a) water drops (b) radio music (c) sound too high to hear (d) bright light
  6. 6.📡 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) No (b) Yes
  7. 7.📡 A distance sensor sends a sound pulse and hears the echo 7 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 11 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
  9. 9.📡 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?
  10. 10.📡 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?
  11. 11.📡 A robot is 100 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 6 seconds (in cm)?
  12. 12.📡 A robot is 190 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 1 second (in cm)?
  13. 13.📡 A robot is 250 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)?
  14. 14.📡 An object is 221 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
  15. 15.📡 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) Yes (b) No
  16. 16.📡 A robot is 120 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 5 seconds (in cm)?
  17. 17.📡 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)?
  18. 18.📡 A robot is 220 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 11 seconds (in cm)?
  19. 19.📡 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)?
  20. 20.📡 A distance sensor sends a sound pulse and hears the echo 17 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
  21. 21.📡 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 12 seconds (in cm)?
  22. 22.📡 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?
  23. 23.📡 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?
  24. 24.📡 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?
  25. 25.📡 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 28 seconds (in cm)?
  26. 26.📡 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)?
  27. 27.📡 A robot is 200 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)?
  28. 28.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
  29. 29.📡 A robot is 120 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 3 seconds (in cm)?
  30. 30.📡 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) Yes (b) No
  31. 31.📡 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?
  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.📡 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 3 seconds (in cm)?
  34. 34.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 34 cm (b) 1 km (c) 340 cm (d) 3 cm
  35. 35.📡 An object is 51 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
  36. 36.📡 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)?
  37. 37.📡 A robot is 280 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)?
  38. 38.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
  39. 39.📡 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)?
  40. 40.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 5 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No

Answer key

  1. it goes there and back
  2. 136
  3. 200
  4. Yes
  5. sound too high to hear
  6. No
  7. 119
  8. 187
  9. 7
  10. 16
  11. 10
  12. 170
  13. 190
  14. 13
  15. Yes
  16. 70
  17. 238
  18. 55
  19. 323
  20. 289
  21. 10
  22. 17
  23. 19
  24. 2
  25. 20
  26. 34
  27. 170
  28. No
  29. 60
  30. Yes
  31. 15
  32. 4
  33. 70
  34. 34 cm
  35. 3
  36. 204
  37. 120
  38. Yes
  39. 340
  40. Yes

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