← The distance sensor lesson New set →

Robotics Worksheet: Ultrasonic Distance Sensor

Robotics lesson 17: The distance sensor · Set 939 · 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.📡 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)?
  2. 2.📡 A robot is 240 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 14 seconds (in cm)?
  3. 3.📡 A robot is 270 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 14 seconds (in cm)?
  4. 4.📡 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 6 seconds (in cm)?
  5. 5.📡 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 3 seconds (in cm)?
  6. 6.📡 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?
  7. 7.📡 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?
  8. 8.📡 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?
  9. 9.📡 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)?
  10. 10.📡 Which animal finds its way by echoes, like this sensor? (a) a goldfish (b) a bat (c) a snail (d) a cow
  11. 11.📡 A robot is 190 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 8 seconds (in cm)?
  12. 12.📡 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)?
  13. 13.📡 A robot is 150 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)?
  14. 14.📡 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 28 seconds (in cm)?
  15. 15.📡 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)?
  16. 16.📡 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?
  17. 17.📡 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
  18. 18.📡 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)?
  19. 19.📡 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 1 second (in cm)?
  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) Yes (b) No
  21. 21.📡 A robot is 290 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)?
  22. 22.📡 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
  23. 23.📡 Why do we halve the echo’s total path? (a) sound is slow (b) the sensor is half (c) it goes there and back (d) to make it smaller
  24. 24.📡 A robot is 130 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)?
  25. 25.📡 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)?
  26. 26.📡 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?
  27. 27.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
  28. 28.📡 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)?
  29. 29.📡 What does an ultrasonic distance sensor send out? (a) bright light (b) radio music (c) water drops (d) sound too high to hear
  30. 30.📡 A robot is 120 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 9 seconds (in cm)?
  31. 31.📡 A robot is 220 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)?
  32. 32.📡 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
  33. 33.📡 A robot is 230 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)?
  34. 34.📡 An object is 255 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
  35. 35.📡 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)?
  36. 36.📡 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?
  37. 37.📡 A robot is 290 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 4 seconds (in cm)?
  38. 38.📡 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?
  39. 39.📡 A robot is 240 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)?
  40. 40.📡 A robot is 230 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 36 seconds (in cm)?

Answer key

  1. 340
  2. 100
  3. 60
  4. 40
  5. 40
  6. 11
  7. 6
  8. 1
  9. 272
  10. a bat
  11. 30
  12. 136
  13. 90
  14. 60
  15. 85
  16. 9
  17. No
  18. 204
  19. 95
  20. Yes
  21. 155
  22. No
  23. it goes there and back
  24. 30
  25. 255
  26. 8
  27. No
  28. 238
  29. sound too high to hear
  30. 30
  31. 10
  32. Yes
  33. 220
  34. 15
  35. 170
  36. 20
  37. 250
  38. 2
  39. 200
  40. 50

Free robotics lessons, practice and worksheets at talentjr.in/robotics-for-kids