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Robotics Worksheet: Ultrasonic Distance Sensor

Robotics lesson 17: The distance sensor · Set 48 · 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 51 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
  2. 2.📡 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
  3. 3.📡 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
  4. 4.📡 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)?
  5. 5.📡 A robot is 100 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)?
  6. 6.📡 What does an ultrasonic distance sensor send out? (a) sound too high to hear (b) radio music (c) water drops (d) bright light
  7. 7.📡 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
  8. 8.📡 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)?
  9. 9.📡 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)?
  10. 10.📡 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
  11. 11.📡 A robot is 230 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 11 seconds (in cm)?
  12. 12.📡 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)?
  13. 13.📡 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)?
  14. 14.📡 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)?
  15. 15.📡 Why do we halve the echo’s total path? (a) sound is slow (b) it goes there and back (c) to make it smaller (d) the sensor is half
  16. 16.📡 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 6 seconds (in cm)?
  17. 17.📡 A robot is 300 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 6 seconds (in cm)?
  18. 18.📡 Which animal finds its way by echoes, like this sensor? (a) a snail (b) a cow (c) a bat (d) a goldfish
  19. 19.📡 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)?
  20. 20.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 34 cm (b) 1 km (c) 3 cm (d) 340 cm
  21. 21.📡 A robot is 260 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)?
  22. 22.📡 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) Yes (b) No
  23. 23.📡 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 10 seconds (in cm)?
  24. 24.📡 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) No (b) Yes
  25. 25.📡 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
  26. 26.📡 A robot is 110 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)?
  27. 27.📡 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?
  28. 28.📡 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 4 seconds (in cm)?
  29. 29.📡 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?
  30. 30.📡 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)?
  31. 31.📡 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)?
  32. 32.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
  33. 33.📡 Which object is hardest for an echo sensor to notice? (a) a metal door (b) a wooden box (c) a soft foam cushion (d) a flat wall
  34. 34.📡 A robot is 130 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)?
  35. 35.📡 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)?
  36. 36.📡 A robot is 110 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 13 seconds (in cm)?
  37. 37.📡 A robot is 110 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)?
  38. 38.📡 A robot is 140 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 10 seconds (in cm)?
  39. 39.📡 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) No (b) Yes
  40. 40.📡 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

Answer key

  1. 3
  2. Yes
  3. No
  4. 85
  5. 85
  6. sound too high to hear
  7. Yes
  8. 340
  9. 136
  10. No
  11. 65
  12. 68
  13. 272
  14. 102
  15. it goes there and back
  16. 40
  17. 210
  18. a bat
  19. 119
  20. 34 cm
  21. 80
  22. No
  23. 200
  24. Yes
  25. No
  26. 50
  27. 11
  28. 150
  29. 9
  30. 17
  31. 187
  32. Yes
  33. a soft foam cushion
  34. 100
  35. 255
  36. 45
  37. 70
  38. 90
  39. No
  40. No

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