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Robotics Worksheet: Ultrasonic Distance Sensor

Robotics lesson 17: The distance sensor · Set 944 · 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 60 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
  2. 2.📡 Why do we halve the echo’s total path? (a) sound is slow (b) to make it smaller (c) it goes there and back (d) the sensor is half
  3. 3.📡 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?
  4. 4.📡 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) Yes (b) No
  5. 5.📡 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?
  6. 6.📡 Which object is hardest for an echo sensor to notice? (a) a wooden box (b) a metal door (c) a soft foam cushion (d) a flat wall
  7. 7.📡 An object is 238 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
  8. 8.📡 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 15 seconds (in cm)?
  9. 9.📡 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?
  10. 10.📡 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) Yes (b) No
  11. 11.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 34 cm (b) 1 km (c) 340 cm (d) 3 cm
  12. 12.📡 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)?
  13. 13.📡 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?
  14. 14.📡 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
  15. 15.📡 A robot is 130 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 7 seconds (in cm)?
  16. 16.📡 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 9 seconds (in cm)?
  17. 17.📡 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?
  18. 18.📡 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
  19. 19.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
  20. 20.📡 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
  21. 21.📡 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 2 seconds (in cm)?
  22. 22.📡 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?
  23. 23.📡 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?
  24. 24.📡 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)?
  25. 25.📡 A robot is 100 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)?
  26. 26.📡 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 4 seconds (in cm)?
  27. 27.📡 A robot is 280 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 39 seconds (in cm)?
  28. 28.📡 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
  29. 29.📡 A robot is 290 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)?
  30. 30.📡 Which animal finds its way by echoes, like this sensor? (a) a bat (b) a goldfish (c) a snail (d) a cow
  31. 31.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
  32. 32.📡 A robot is 160 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 7 seconds (in cm)?
  33. 33.📡 A robot is 150 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)?
  34. 34.📡 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
  35. 35.📡 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)?
  36. 36.📡 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)?
  37. 37.📡 What does an ultrasonic distance sensor send out? (a) bright light (b) water drops (c) sound too high to hear (d) radio music
  38. 38.📡 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?
  39. 39.📡 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)?
  40. 40.📡 A robot is 270 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)?

Answer key

  1. No
  2. it goes there and back
  3. 13
  4. Yes
  5. 11
  6. a soft foam cushion
  7. 14
  8. 75
  9. 4
  10. No
  11. 34 cm
  12. 187
  13. 10
  14. No
  15. 25
  16. 15
  17. 20
  18. No
  19. No
  20. Yes
  21. 120
  22. 7
  23. 9
  24. 85
  25. 15
  26. 40
  27. 85
  28. No
  29. 50
  30. a bat
  31. No
  32. 20
  33. 110
  34. Yes
  35. 136
  36. 119
  37. sound too high to hear
  38. 17
  39. 34
  40. 205

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