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Robotics Worksheet: Ultrasonic Distance Sensor

Robotics lesson 17: The distance sensor · Set 976 · 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 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 26 seconds (in cm)?
  2. 2.📡 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?
  3. 3.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
  4. 4.📡 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)?
  5. 5.📡 Why do we halve the echo’s total path? (a) the sensor is half (b) it goes there and back (c) sound is slow (d) to make it smaller
  6. 6.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 7 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 20 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
  8. 8.📡 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
  9. 9.📡 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?
  10. 10.📡 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?
  11. 11.📡 A robot is 100 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)?
  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 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 13 seconds (in cm)?
  14. 14.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 34 cm (b) 340 cm (c) 3 cm (d) 1 km
  15. 15.📡 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?
  16. 16.📡 A distance sensor sends a sound pulse and hears the echo 1 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 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
  18. 18.📡 A robot is 210 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 10 seconds (in cm)?
  19. 19.📡 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?
  20. 20.📡 Which animal finds its way by echoes, like this sensor? (a) a cow (b) a goldfish (c) a bat (d) a snail
  21. 21.📡 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) Yes (b) No
  22. 22.📡 A robot is 180 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)?
  23. 23.📡 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 2 seconds (in cm)?
  24. 24.📡 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)?
  25. 25.📡 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)?
  26. 26.📡 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) No (b) Yes
  27. 27.📡 A robot is 110 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)?
  28. 28.📡 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)?
  29. 29.📡 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)?
  30. 30.📡 What does an ultrasonic distance sensor send out? (a) radio music (b) water drops (c) bright light (d) sound too high to hear
  31. 31.📡 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
  32. 32.📡 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
  33. 33.📡 A robot is 130 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)?
  34. 34.📡 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
  35. 35.📡 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)?
  36. 36.📡 A robot is 230 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)?
  37. 37.📡 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?
  38. 38.📡 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?
  39. 39.📡 A robot is 180 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 15 seconds (in cm)?
  40. 40.📡 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)?

Answer key

  1. 10
  2. 1
  3. Yes
  4. 136
  5. it goes there and back
  6. No
  7. 340
  8. No
  9. 19
  10. 13
  11. 80
  12. 20
  13. 25
  14. 34 cm
  15. 2
  16. 17
  17. Yes
  18. 10
  19. 18
  20. a bat
  21. No
  22. 155
  23. 140
  24. 238
  25. 323
  26. No
  27. 95
  28. 204
  29. 34
  30. sound too high to hear
  31. No
  32. No
  33. 105
  34. No
  35. 272
  36. 170
  37. 11
  38. 3
  39. 105
  40. 187

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