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Robotics Worksheet: Ultrasonic Distance Sensor

Robotics lesson 17: The distance sensor · Set 211 · 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 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)?
  2. 2.📡 A robot is 250 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 1 second (in cm)?
  3. 3.📡 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
  4. 4.📡 Why do we halve the echo’s total path? (a) sound is slow (b) to make it smaller (c) the sensor is half (d) it goes there and back
  5. 5.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
  6. 6.📡 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)?
  7. 7.📡 A robot is 180 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 19 seconds (in cm)?
  8. 8.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
  9. 9.📡 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?
  10. 10.📡 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 18 seconds (in cm)?
  11. 11.📡 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?
  12. 12.📡 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
  13. 13.📡 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)?
  14. 14.📡 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 4 seconds (in cm)?
  15. 15.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 5 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
  16. 16.📡 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)?
  17. 17.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 5 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
  18. 18.📡 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)?
  19. 19.📡 What does an ultrasonic distance sensor send out? (a) bright light (b) sound too high to hear (c) radio music (d) water drops
  20. 20.📡 A robot is 260 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 1 second (in cm)?
  21. 21.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 3 cm (b) 1 km (c) 340 cm (d) 34 cm
  22. 22.📡 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
  23. 23.📡 A distance sensor sends a sound pulse and hears the echo 19 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
  24. 24.📡 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?
  25. 25.📡 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?
  26. 26.📡 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)?
  27. 27.📡 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?
  28. 28.📡 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?
  29. 29.📡 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)?
  30. 30.📡 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)?
  31. 31.📡 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) No (b) Yes
  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 animal finds its way by echoes, like this sensor? (a) a cow (b) a bat (c) a snail (d) a goldfish
  34. 34.📡 A distance sensor sends a sound pulse and hears the echo 3 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
  35. 35.📡 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?
  36. 36.📡 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)?
  37. 37.📡 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
  38. 38.📡 A robot is 150 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)?
  39. 39.📡 A robot is 210 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)?
  40. 40.📡 An object is 306 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?

Answer key

  1. 204
  2. 245
  3. a soft foam cushion
  4. it goes there and back
  5. Yes
  6. 340
  7. 85
  8. No
  9. 20
  10. 10
  11. 2
  12. Yes
  13. 170
  14. 60
  15. No
  16. 85
  17. No
  18. 238
  19. sound too high to hear
  20. 255
  21. 34 cm
  22. No
  23. 323
  24. 1
  25. 7
  26. 289
  27. 6
  28. 17
  29. 102
  30. 306
  31. Yes
  32. Yes
  33. a bat
  34. 51
  35. 19
  36. 272
  37. No
  38. 60
  39. 140
  40. 18

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