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Robotics Worksheet: Ultrasonic Distance Sensor

Robotics lesson 17: The distance sensor · Set 445 · 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 170 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
  2. 2.📡 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 5 seconds (in cm)?
  3. 3.📡 Which animal finds its way by echoes, like this sensor? (a) a snail (b) a bat (c) a cow (d) a goldfish
  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.📡 A robot is 210 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 11 seconds (in cm)?
  6. 6.📡 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?
  7. 7.📡 What does an ultrasonic distance sensor send out? (a) bright light (b) water drops (c) radio music (d) sound too high to hear
  8. 8.📡 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?
  9. 9.📡 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)?
  10. 10.📡 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)?
  11. 11.📡 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?
  12. 12.📡 Why do we halve the echo’s total path? (a) sound is slow (b) to make it smaller (c) the sensor is half (d) it goes there and back
  13. 13.📡 A robot is 210 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 4 seconds (in cm)?
  14. 14.📡 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?
  15. 15.📡 Which object is hardest for an echo sensor to notice? (a) a wooden box (b) a metal door (c) a soft foam cushion (d) a flat wall
  16. 16.📡 An object is 153 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
  17. 17.📡 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)?
  18. 18.📡 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?
  19. 19.📡 A robot is 140 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)?
  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 robot is 130 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)?
  22. 22.📡 A robot is 180 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)?
  23. 23.📡 A robot is 290 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 1 second (in cm)?
  24. 24.📡 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 6 seconds (in cm)?
  25. 25.📡 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)?
  26. 26.📡 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
  27. 27.📡 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 17 seconds (in cm)?
  28. 28.📡 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
  29. 29.📡 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?
  30. 30.📡 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)?
  31. 31.📡 A robot is 290 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 18 seconds (in cm)?
  32. 32.📡 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 6 seconds (in cm)?
  33. 33.📡 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)?
  34. 34.📡 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)?
  35. 35.📡 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 22 seconds (in cm)?
  36. 36.📡 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 20 seconds (in cm)?
  37. 37.📡 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 4 seconds (in cm)?
  38. 38.📡 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)?
  39. 39.📡 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
  40. 40.📡 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 7 seconds (in cm)?

Answer key

  1. 10
  2. 60
  3. a bat
  4. Yes
  5. 155
  6. 2
  7. sound too high to hear
  8. 17
  9. 60
  10. 90
  11. 16
  12. it goes there and back
  13. 190
  14. 6
  15. a soft foam cushion
  16. 9
  17. 85
  18. 8
  19. 40
  20. 136
  21. 80
  22. 150
  23. 280
  24. 60
  25. 306
  26. No
  27. 35
  28. Yes
  29. 18
  30. 323
  31. 110
  32. 80
  33. 272
  34. 238
  35. 40
  36. 70
  37. 190
  38. 221
  39. No
  40. 50

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