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Robotics Worksheet: Ultrasonic Distance Sensor

Robotics lesson 17: The distance sensor · Set 892 · 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.📡 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?
  2. 2.📡 A robot is 100 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)?
  3. 3.📡 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 2 seconds (in cm)?
  4. 4.📡 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)?
  5. 5.📡 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
  6. 6.📡 Why do we halve the echo’s total path? (a) to make it smaller (b) it goes there and back (c) the sensor is half (d) sound is slow
  7. 7.📡 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
  8. 8.📡 A robot is 280 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 16 seconds (in cm)?
  9. 9.📡 What does an ultrasonic distance sensor send out? (a) sound too high to hear (b) water drops (c) bright light (d) radio music
  10. 10.📡 Which object is hardest for an echo sensor to notice? (a) a wooden box (b) a flat wall (c) a metal door (d) a soft foam cushion
  11. 11.📡 An object is 51 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
  12. 12.📡 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?
  13. 13.📡 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?
  14. 14.📡 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)?
  15. 15.📡 A robot is 220 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 10 seconds (in cm)?
  16. 16.📡 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)?
  17. 17.📡 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)?
  18. 18.📡 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
  19. 19.📡 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?
  20. 20.📡 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?
  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 1 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
  23. 23.📡 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)?
  24. 24.📡 A robot is 190 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)?
  25. 25.📡 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?
  26. 26.📡 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)?
  27. 27.📡 A robot is 220 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)?
  28. 28.📡 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)?
  29. 29.📡 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
  30. 30.📡 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
  31. 31.📡 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) Yes (b) No
  32. 32.📡 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
  33. 33.📡 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
  34. 34.📡 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)?
  35. 35.📡 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
  36. 36.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 340 cm (b) 34 cm (c) 3 cm (d) 1 km
  37. 37.📡 A robot is 140 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 9 seconds (in cm)?
  38. 38.📡 A robot is 140 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 10 seconds (in cm)?
  39. 39.📡 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)?
  40. 40.📡 A robot is 280 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)?

Answer key

  1. 5
  2. 20
  3. 100
  4. 34
  5. No
  6. it goes there and back
  7. No
  8. 40
  9. sound too high to hear
  10. a soft foam cushion
  11. 3
  12. 6
  13. 2
  14. 340
  15. 70
  16. 51
  17. 272
  18. No
  19. 16
  20. 19
  21. a bat
  22. 17
  23. 306
  24. 145
  25. 18
  26. 170
  27. 55
  28. 20
  29. Yes
  30. No
  31. No
  32. No
  33. No
  34. 238
  35. No
  36. 34 cm
  37. 95
  38. 40
  39. 323
  40. 270

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