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Robotics Worksheet: Ultrasonic Distance Sensor

Robotics lesson 17: The distance sensor · Set 575 · 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.

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  1. 1.📡 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) Yes (b) No
  2. 2.📡 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)?
  3. 3.📡 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)?
  4. 4.📡 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?
  5. 5.📡 Why do we halve the echo’s total path? (a) the sensor is half (b) it goes there and back (c) to make it smaller (d) sound is slow
  6. 6.📡 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 1 second (in cm)?
  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.📡 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 10 seconds (in cm)?
  9. 9.📡 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?
  10. 10.📡 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?
  11. 11.📡 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)?
  12. 12.📡 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?
  13. 13.📡 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?
  14. 14.📡 A distance sensor sends a sound pulse and hears the echo 9 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
  15. 15.📡 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 9 seconds (in cm)?
  16. 16.📡 A robot is 160 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)?
  17. 17.📡 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)?
  18. 18.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 1 km (b) 340 cm (c) 34 cm (d) 3 cm
  19. 19.📡 What does an ultrasonic distance sensor send out? (a) sound too high to hear (b) water drops (c) radio music (d) bright light
  20. 20.📡 Which animal finds its way by echoes, like this sensor? (a) a snail (b) a goldfish (c) a cow (d) a bat
  21. 21.📡 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)?
  22. 22.📡 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
  23. 23.📡 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) Yes (b) No
  24. 24.📡 A robot is 190 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)?
  25. 25.📡 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?
  26. 26.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
  27. 27.📡 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?
  28. 28.📡 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) No (b) Yes
  29. 29.📡 A robot is 240 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)?
  30. 30.📡 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)?
  31. 31.📡 A robot is 270 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.📡 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?
  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.📡 Which object is hardest for an echo sensor to notice? (a) a flat wall (b) a wooden box (c) a metal door (d) a soft foam cushion
  35. 35.📡 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)?
  36. 36.📡 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?
  37. 37.📡 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
  38. 38.📡 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?
  39. 39.📡 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?
  40. 40.📡 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 12 seconds (in cm)?

Answer key

  1. No
  2. 85
  3. 136
  4. 2
  5. it goes there and back
  6. 105
  7. 6
  8. 10
  9. 1
  10. 17
  11. 272
  12. 16
  13. 19
  14. 153
  15. 110
  16. 120
  17. 306
  18. 34 cm
  19. sound too high to hear
  20. a bat
  21. 68
  22. Yes
  23. Yes
  24. 160
  25. 12
  26. Yes
  27. 10
  28. Yes
  29. 60
  30. 255
  31. 90
  32. 14
  33. 4
  34. a soft foam cushion
  35. 221
  36. 3
  37. No
  38. 20
  39. 15
  40. 150

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