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Robotics Worksheet: Ultrasonic Distance Sensor

Robotics lesson 17: The distance sensor · Set 548 · 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.📡 Why do we halve the echo’s total path? (a) it goes there and back (b) sound is slow (c) the sensor is half (d) to make it smaller
  2. 2.📡 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)?
  3. 3.📡 Which object is hardest for an echo sensor to notice? (a) a wooden box (b) a flat wall (c) a soft foam cushion (d) a metal door
  4. 4.📡 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 11 seconds (in cm)?
  5. 5.📡 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
  6. 6.📡 Which animal finds its way by echoes, like this sensor? (a) a goldfish (b) a snail (c) a bat (d) a cow
  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 250 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 42 seconds (in cm)?
  9. 9.📡 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) No (b) Yes
  10. 10.📡 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)?
  11. 11.📡 A robot is 120 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 5 seconds (in cm)?
  12. 12.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 340 cm (b) 1 km (c) 3 cm (d) 34 cm
  13. 13.📡 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
  14. 14.📡 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?
  15. 15.📡 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)?
  16. 16.📡 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?
  17. 17.📡 An object is 85 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
  18. 18.📡 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?
  19. 19.📡 What does an ultrasonic distance sensor send out? (a) bright light (b) radio music (c) sound too high to hear (d) water drops
  20. 20.📡 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)?
  21. 21.📡 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?
  22. 22.📡 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)?
  23. 23.📡 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
  24. 24.📡 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 13 seconds (in cm)?
  25. 25.📡 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)?
  26. 26.📡 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
  27. 27.📡 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)?
  28. 28.📡 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)?
  29. 29.📡 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?
  30. 30.📡 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 3 seconds (in cm)?
  31. 31.📡 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 2 seconds (in cm)?
  32. 32.📡 A robot is 180 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)?
  33. 33.📡 A robot is 290 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 52 seconds (in cm)?
  34. 34.📡 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?
  35. 35.📡 An object is 204 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 12 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
  37. 37.📡 A robot is 300 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 35 seconds (in cm)?
  38. 38.📡 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)?
  39. 39.📡 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 3 seconds (in cm)?
  40. 40.📡 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)?

Answer key

  1. it goes there and back
  2. 306
  3. a soft foam cushion
  4. 20
  5. Yes
  6. a bat
  7. 14
  8. 40
  9. No
  10. 68
  11. 20
  12. 34 cm
  13. Yes
  14. 16
  15. 34
  16. 13
  17. 5
  18. 17
  19. sound too high to hear
  20. 85
  21. 20
  22. 221
  23. No
  24. 105
  25. 25
  26. No
  27. 238
  28. 272
  29. 6
  30. 105
  31. 200
  32. 90
  33. 30
  34. 8
  35. 12
  36. 204
  37. 125
  38. 170
  39. 240
  40. 102

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