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Robotics Worksheet: Ultrasonic Distance Sensor

Robotics lesson 17: The distance sensor · Set 71 · 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.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 34 cm (b) 340 cm (c) 3 cm (d) 1 km
  2. 2.📡 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 11 seconds (in cm)?
  3. 3.📡 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) Yes (b) No
  4. 4.📡 A robot is 210 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 32 seconds (in cm)?
  5. 5.📡 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) Yes (b) No
  6. 6.📡 Which object is hardest for an echo sensor to notice? (a) a soft foam cushion (b) a flat wall (c) a metal door (d) a wooden box
  7. 7.📡 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?
  8. 8.📡 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?
  9. 9.📡 Why do we halve the echo’s total path? (a) it goes there and back (b) the sensor is half (c) to make it smaller (d) sound is slow
  10. 10.📡 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 1 second (in cm)?
  11. 11.📡 A robot is 180 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 16 seconds (in cm)?
  12. 12.📡 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?
  13. 13.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
  14. 14.📡 What does an ultrasonic distance sensor send out? (a) water drops (b) radio music (c) sound too high to hear (d) bright light
  15. 15.📡 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
  16. 16.📡 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) Yes (b) No
  17. 17.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 1 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 5 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
  19. 19.📡 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
  20. 20.📡 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
  21. 21.📡 Which animal finds its way by echoes, like this sensor? (a) a cow (b) a snail (c) a goldfish (d) a bat
  22. 22.📡 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)?
  23. 23.📡 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) No (b) Yes
  24. 24.📡 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 16 seconds (in cm)?
  25. 25.📡 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)?
  26. 26.📡 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
  27. 27.📡 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)?
  28. 28.📡 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 13 seconds (in cm)?
  29. 29.📡 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 12 seconds (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 is 130 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)?
  32. 32.📡 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)?
  33. 33.📡 A robot is 160 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)?
  34. 34.📡 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)?
  35. 35.📡 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?
  36. 36.📡 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?
  37. 37.📡 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
  38. 38.📡 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 7 seconds (in cm)?
  39. 39.📡 A robot is 220 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 1 second (in cm)?
  40. 40.📡 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 16 seconds (in cm)?

Answer key

  1. 34 cm
  2. 75
  3. No
  4. 50
  5. No
  6. a soft foam cushion
  7. 2
  8. 13
  9. it goes there and back
  10. 195
  11. 20
  12. 1
  13. Yes
  14. sound too high to hear
  15. Yes
  16. Yes
  17. Yes
  18. 85
  19. No
  20. No
  21. a bat
  22. 68
  23. No
  24. 200
  25. 102
  26. No
  27. 51
  28. 40
  29. 40
  30. 306
  31. 55
  32. 221
  33. 130
  34. 340
  35. 16
  36. 8
  37. Yes
  38. 200
  39. 210
  40. 50

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