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Robotics Worksheet: Ultrasonic Distance Sensor

Robotics lesson 17: The distance sensor · Set 309 · 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 136 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 170 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 is 190 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)?
  4. 4.📡 Which animal finds its way by echoes, like this sensor? (a) a goldfish (b) a snail (c) a cow (d) a bat
  5. 5.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 4 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) Yes (b) No
  7. 7.📡 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?
  8. 8.📡 Why do we halve the echo’s total path? (a) to make it smaller (b) it goes there and back (c) sound is slow (d) the sensor is half
  9. 9.📡 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 32 seconds (in cm)?
  10. 10.📡 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)?
  11. 11.📡 A robot is 190 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 3 seconds (in cm)?
  12. 12.📡 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 1 second (in cm)?
  13. 13.📡 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 2 seconds (in cm)?
  14. 14.📡 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?
  15. 15.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 340 cm (b) 34 cm (c) 1 km (d) 3 cm
  16. 16.📡 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 8 seconds (in cm)?
  17. 17.📡 An object is 255 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
  18. 18.📡 A robot is 220 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 7 seconds (in cm)?
  19. 19.📡 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?
  20. 20.📡 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) Yes (b) No
  21. 21.📡 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)?
  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 robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 5 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
  24. 24.📡 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)?
  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 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)?
  27. 27.📡 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)?
  28. 28.📡 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?
  29. 29.📡 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)?
  30. 30.📡 A robot is 150 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 6 seconds (in cm)?
  31. 31.📡 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)?
  32. 32.📡 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 35 seconds (in cm)?
  33. 33.📡 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?
  34. 34.📡 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
  35. 35.📡 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?
  36. 36.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
  37. 37.📡 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) Yes (b) No
  38. 38.📡 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)?
  39. 39.📡 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
  40. 40.📡 A robot is 120 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)?

Answer key

  1. 8
  2. 10
  3. 90
  4. a bat
  5. No
  6. No
  7. 6
  8. it goes there and back
  9. 110
  10. 255
  11. 130
  12. 160
  13. 160
  14. 2
  15. 34 cm
  16. 170
  17. 15
  18. 80
  19. 7
  20. No
  21. 119
  22. 11
  23. Yes
  24. 170
  25. 340
  26. 40
  27. 85
  28. 19
  29. 68
  30. 30
  31. 80
  32. 45
  33. 4
  34. No
  35. 20
  36. No
  37. Yes
  38. 204
  39. No
  40. 15

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