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Robotics Worksheet: Ultrasonic Distance Sensor

Robotics lesson 17: The distance sensor · Set 212 · 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.📡 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)?
  2. 2.📡 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 3 seconds (in cm)?
  3. 3.📡 A robot is 260 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 12 seconds (in cm)?
  4. 4.📡 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?
  5. 5.📡 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?
  6. 6.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
  7. 7.📡 A robot is 280 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 23 seconds (in cm)?
  8. 8.📡 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) No (b) Yes
  9. 9.📡 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?
  10. 10.📡 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
  11. 11.📡 What does an ultrasonic distance sensor send out? (a) water drops (b) bright light (c) radio music (d) sound too high to hear
  12. 12.📡 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?
  13. 13.📡 Which object is hardest for an echo sensor to notice? (a) a metal door (b) a wooden box (c) a flat wall (d) a soft foam cushion
  14. 14.📡 Which animal finds its way by echoes, like this sensor? (a) a cow (b) a goldfish (c) a snail (d) a bat
  15. 15.📡 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)?
  16. 16.📡 An object is 221 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 20 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
  18. 18.📡 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)?
  19. 19.📡 Why do we halve the echo’s total path? (a) to make it smaller (b) sound is slow (c) it goes there and back (d) the sensor is half
  20. 20.📡 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 1 second (in cm)?
  21. 21.📡 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?
  22. 22.📡 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
  23. 23.📡 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?
  24. 24.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 3 cm (b) 340 cm (c) 1 km (d) 34 cm
  25. 25.📡 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?
  26. 26.📡 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 7 seconds (in cm)?
  27. 27.📡 A robot is 160 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)?
  28. 28.📡 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)?
  29. 29.📡 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) No (b) Yes
  30. 30.📡 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
  31. 31.📡 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 12 seconds (in cm)?
  32. 32.📡 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?
  33. 33.📡 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
  34. 34.📡 A distance sensor sends a sound pulse and hears the echo 11 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
  35. 35.📡 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
  36. 36.📡 A robot is 300 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)?
  37. 37.📡 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)?
  38. 38.📡 A robot is 200 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 34 seconds (in cm)?
  39. 39.📡 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)?
  40. 40.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No

Answer key

  1. 255
  2. 170
  3. 20
  4. 11
  5. 17
  6. No
  7. 50
  8. No
  9. 19
  10. Yes
  11. sound too high to hear
  12. 2
  13. a soft foam cushion
  14. a bat
  15. 136
  16. 13
  17. 340
  18. 221
  19. it goes there and back
  20. 110
  21. 6
  22. Yes
  23. 15
  24. 34 cm
  25. 16
  26. 200
  27. 85
  28. 153
  29. No
  30. No
  31. 120
  32. 12
  33. No
  34. 187
  35. No
  36. 230
  37. 272
  38. 30
  39. 306
  40. No

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