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Robotics Worksheet: Ultrasonic Distance Sensor

Robotics lesson 17: The distance sensor · Set 169 · 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 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
  2. 2.📡 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)?
  3. 3.📡 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?
  4. 4.📡 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?
  5. 5.📡 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
  6. 6.📡 What does an ultrasonic distance sensor send out? (a) radio music (b) bright light (c) water drops (d) sound too high to hear
  7. 7.📡 A distance sensor sends a sound pulse and hears the echo 2 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
  8. 8.📡 A robot is 130 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)?
  9. 9.📡 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)?
  10. 10.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 1 km (b) 340 cm (c) 3 cm (d) 34 cm
  11. 11.📡 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 2 seconds (in cm)?
  12. 12.📡 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)?
  13. 13.📡 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)?
  14. 14.📡 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)?
  15. 15.📡 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?
  16. 16.📡 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)?
  17. 17.📡 Which animal finds its way by echoes, like this sensor? (a) a bat (b) a goldfish (c) a snail (d) a cow
  18. 18.📡 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) Yes (b) No
  19. 19.📡 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?
  20. 20.📡 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?
  21. 21.📡 Which object is hardest for an echo sensor to notice? (a) a soft foam cushion (b) a wooden box (c) a metal door (d) a flat wall
  22. 22.📡 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
  23. 23.📡 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?
  24. 24.📡 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?
  25. 25.📡 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) No (b) Yes
  26. 26.📡 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?
  27. 27.📡 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) No (b) Yes
  28. 28.📡 A robot is 120 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)?
  29. 29.📡 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 26 seconds (in cm)?
  30. 30.📡 A robot is 140 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 2 seconds (in cm)?
  31. 31.📡 A robot is 240 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 14 seconds (in cm)?
  32. 32.📡 A robot is 140 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 11 seconds (in cm)?
  33. 33.📡 A robot is 190 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 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)?
  35. 35.📡 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 17 seconds (in cm)?
  36. 36.📡 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
  37. 37.📡 A distance sensor sends a sound pulse and hears the echo 14 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
  38. 38.📡 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?
  39. 39.📡 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) Yes (b) No
  40. 40.📡 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?

Answer key

  1. Yes
  2. 340
  3. 19
  4. 6
  5. it goes there and back
  6. sound too high to hear
  7. 34
  8. 30
  9. 102
  10. 34 cm
  11. 170
  12. 204
  13. 289
  14. 272
  15. 13
  16. 170
  17. a bat
  18. Yes
  19. 2
  20. 9
  21. a soft foam cushion
  22. No
  23. 5
  24. 17
  25. No
  26. 4
  27. Yes
  28. 100
  29. 60
  30. 100
  31. 30
  32. 30
  33. 10
  34. 85
  35. 115
  36. No
  37. 238
  38. 12
  39. No
  40. 16

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