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Robotics Worksheet: Ultrasonic Distance Sensor

Robotics lesson 17: The distance sensor · Set 780 · 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 204 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
  2. 2.📡 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?
  3. 3.📡 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) No (b) Yes
  4. 4.📡 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 9 seconds (in cm)?
  5. 5.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
  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 robot is 250 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 23 seconds (in cm)?
  8. 8.📡 A robot is 220 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)?
  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.📡 A robot is 280 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)?
  11. 11.📡 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)?
  12. 12.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 34 cm (b) 1 km (c) 3 cm (d) 340 cm
  13. 13.📡 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
  14. 14.📡 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?
  15. 15.📡 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?
  16. 16.📡 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 10 seconds (in cm)?
  17. 17.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 5 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
  18. 18.📡 What does an ultrasonic distance sensor send out? (a) radio music (b) bright light (c) water drops (d) sound too high to hear
  19. 19.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
  20. 20.📡 A robot is 170 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)?
  21. 21.📡 A robot is 160 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)?
  22. 22.📡 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?
  23. 23.📡 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 12 seconds (in cm)?
  24. 24.📡 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?
  25. 25.📡 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)?
  26. 26.📡 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 23 seconds (in cm)?
  27. 27.📡 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?
  28. 28.📡 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)?
  29. 29.📡 Which animal finds its way by echoes, like this sensor? (a) a bat (b) a goldfish (c) a cow (d) a snail
  30. 30.📡 A distance sensor sends a sound pulse and hears the echo 10 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
  31. 31.📡 Which object is hardest for an echo sensor to notice? (a) a flat wall (b) a soft foam cushion (c) a metal door (d) a wooden box
  32. 32.📡 A distance sensor sends a sound pulse and hears the echo 3 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
  33. 33.📡 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 19 seconds (in cm)?
  34. 34.📡 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)?
  35. 35.📡 A robot is 280 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 18 seconds (in cm)?
  36. 36.📡 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)?
  37. 37.📡 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 4 seconds (in cm)?
  38. 38.📡 A robot is 270 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)?
  39. 39.📡 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) No (b) Yes
  40. 40.📡 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 12 seconds (in cm)?

Answer key

  1. 12
  2. 9
  3. No
  4. 10
  5. No
  6. No
  7. 135
  8. 120
  9. 7
  10. 220
  11. 255
  12. 34 cm
  13. Yes
  14. 4
  15. 5
  16. 80
  17. No
  18. sound too high to hear
  19. No
  20. 155
  21. 140
  22. 6
  23. 60
  24. 16
  25. 340
  26. 15
  27. 17
  28. 85
  29. a bat
  30. 170
  31. a soft foam cushion
  32. 51
  33. 10
  34. 306
  35. 10
  36. 221
  37. 160
  38. 250
  39. Yes
  40. 110

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