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Robotics Worksheet: Ultrasonic Distance Sensor

Robotics lesson 17: The distance sensor · Set 55 · 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 100 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
  2. 2.📡 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)?
  3. 3.📡 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?
  4. 4.📡 Which animal finds its way by echoes, like this sensor? (a) a cow (b) a goldfish (c) a snail (d) a bat
  5. 5.📡 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?
  6. 6.📡 An object is 136 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
  7. 7.📡 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)?
  8. 8.📡 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)?
  9. 9.📡 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?
  10. 10.📡 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) No (b) Yes
  11. 11.📡 A robot is 170 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 8 seconds (in cm)?
  12. 12.📡 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) Yes (b) No
  13. 13.📡 What does an ultrasonic distance sensor send out? (a) sound too high to hear (b) radio music (c) bright light (d) water drops
  14. 14.📡 Why do we halve the echo’s total path? (a) the sensor is half (b) sound is slow (c) it goes there and back (d) to make it smaller
  15. 15.📡 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)?
  16. 16.📡 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
  17. 17.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 340 cm (b) 1 km (c) 3 cm (d) 34 cm
  18. 18.📡 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?
  19. 19.📡 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) No (b) Yes
  20. 20.📡 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
  21. 21.📡 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 3 seconds (in cm)?
  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) Yes (b) No
  23. 23.📡 Which object is hardest for an echo sensor to notice? (a) a wooden box (b) a metal door (c) a flat wall (d) a soft foam cushion
  24. 24.📡 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
  25. 25.📡 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?
  26. 26.📡 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) Yes (b) No
  27. 27.📡 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
  28. 28.📡 A robot is 120 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 5 seconds (in cm)?
  29. 29.📡 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
  30. 30.📡 A robot is 170 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 24 seconds (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 25 seconds (in cm)?
  32. 32.📡 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)?
  33. 33.📡 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?
  34. 34.📡 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 2 seconds (in cm)?
  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.📡 A robot is 110 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 5 seconds (in cm)?
  37. 37.📡 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 5 seconds (in cm)?
  38. 38.📡 A robot is 300 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 14 seconds (in cm)?
  39. 39.📡 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)?
  40. 40.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes

Answer key

  1. Yes
  2. 255
  3. 2
  4. a bat
  5. 7
  6. 8
  7. 136
  8. 85
  9. 10
  10. No
  11. 90
  12. Yes
  13. sound too high to hear
  14. it goes there and back
  15. 289
  16. Yes
  17. 34 cm
  18. 11
  19. Yes
  20. No
  21. 240
  22. No
  23. a soft foam cushion
  24. Yes
  25. 17
  26. No
  27. No
  28. 95
  29. Yes
  30. 50
  31. 20
  32. 119
  33. 13
  34. 100
  35. 221
  36. 35
  37. 25
  38. 20
  39. 51
  40. Yes

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