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Robotics Worksheet: Ultrasonic Distance Sensor

Robotics lesson 17: The distance sensor · Set 710 · 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 13 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
  2. 2.📡 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) Yes (b) No
  3. 3.📡 A robot is 180 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 4 seconds (in cm)?
  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 110 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 8 seconds (in cm)?
  6. 6.📡 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
  7. 7.📡 A robot is 140 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 8 seconds (in cm)?
  8. 8.📡 Why do we halve the echo’s total path? (a) to make it smaller (b) sound is slow (c) the sensor is half (d) it goes there and back
  9. 9.📡 An object is 85 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 120 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 14 seconds (in cm)?
  12. 12.📡 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
  13. 13.📡 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)?
  14. 14.📡 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) Yes (b) No
  15. 15.📡 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
  16. 16.📡 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) Yes (b) No
  17. 17.📡 What does an ultrasonic distance sensor send out? (a) water drops (b) bright light (c) radio music (d) sound too high to hear
  18. 18.📡 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)?
  19. 19.📡 A distance sensor sends a sound pulse and hears the echo 18 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
  20. 20.📡 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
  21. 21.📡 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)?
  22. 22.📡 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?
  23. 23.📡 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)?
  24. 24.📡 Which animal finds its way by echoes, like this sensor? (a) a cow (b) a snail (c) a bat (d) a goldfish
  25. 25.📡 A robot is 100 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 4 seconds (in cm)?
  26. 26.📡 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) No (b) Yes
  27. 27.📡 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?
  28. 28.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 5 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
  29. 29.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
  30. 30.📡 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)?
  31. 31.📡 A robot is 130 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 1 second (in cm)?
  32. 32.📡 A robot is 140 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 21 seconds (in cm)?
  33. 33.📡 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)?
  34. 34.📡 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?
  35. 35.📡 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?
  36. 36.📡 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 16 seconds (in cm)?
  37. 37.📡 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)?
  38. 38.📡 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)?
  39. 39.📡 A robot is 300 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)?
  40. 40.📡 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) Yes (b) No

Answer key

  1. 221
  2. No
  3. 100
  4. 204
  5. 30
  6. No
  7. 60
  8. it goes there and back
  9. 5
  10. 16
  11. 50
  12. No
  13. 85
  14. Yes
  15. Yes
  16. No
  17. sound too high to hear
  18. 153
  19. 306
  20. Yes
  21. 68
  22. 11
  23. 102
  24. a bat
  25. 60
  26. No
  27. 13
  28. No
  29. No
  30. 238
  31. 115
  32. 35
  33. 255
  34. 10
  35. 14
  36. 40
  37. 187
  38. 119
  39. 280
  40. Yes

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