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Robotics Worksheet: Ultrasonic Distance Sensor

Robotics lesson 17: The distance sensor · Set 76 · 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.📡 Which object is hardest for an echo sensor to notice? (a) a soft foam cushion (b) a metal door (c) a flat wall (d) a wooden box
  2. 2.📡 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)?
  3. 3.📡 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?
  4. 4.📡 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?
  5. 5.📡 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
  6. 6.📡 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 12 seconds (in cm)?
  7. 7.📡 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)?
  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.📡 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
  10. 10.📡 A robot is 210 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)?
  11. 11.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
  12. 12.📡 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
  13. 13.📡 A robot is 270 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)?
  14. 14.📡 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 8 seconds (in cm)?
  15. 15.📡 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
  16. 16.📡 A robot is 140 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 7 seconds (in cm)?
  17. 17.📡 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
  18. 18.📡 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?
  19. 19.📡 A robot is 230 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 9 seconds (in cm)?
  20. 20.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 1 km (b) 34 cm (c) 340 cm (d) 3 cm
  21. 21.📡 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?
  22. 22.📡 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)?
  23. 23.📡 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)?
  24. 24.📡 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)?
  25. 25.📡 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?
  26. 26.📡 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)?
  27. 27.📡 A robot is 190 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 30 seconds (in cm)?
  28. 28.📡 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) No (b) Yes
  29. 29.📡 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?
  30. 30.📡 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)?
  31. 31.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
  32. 32.📡 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?
  33. 33.📡 A robot is 200 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 12 seconds (in cm)?
  34. 34.📡 A robot is 290 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 18 seconds (in cm)?
  35. 35.📡 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 6 seconds (in cm)?
  36. 36.📡 Which animal finds its way by echoes, like this sensor? (a) a snail (b) a goldfish (c) a bat (d) a cow
  37. 37.📡 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)?
  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 130 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 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 11 seconds (in cm)?

Answer key

  1. a soft foam cushion
  2. 51
  3. 1
  4. 17
  5. No
  6. 70
  7. 85
  8. No
  9. No
  10. 15
  11. No
  12. Yes
  13. 110
  14. 210
  15. it goes there and back
  16. 35
  17. No
  18. 19
  19. 50
  20. 34 cm
  21. 18
  22. 255
  23. 221
  24. 289
  25. 14
  26. 10
  27. 40
  28. Yes
  29. 11
  30. 102
  31. No
  32. 6
  33. 20
  34. 200
  35. 100
  36. a bat
  37. 17
  38. 3
  39. 55
  40. 30

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