← The distance sensor lesson New set →

Robotics Worksheet: Ultrasonic Distance Sensor

Robotics lesson 17: The distance sensor · Set 893 · 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 robot is 250 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)?
  2. 2.📡 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?
  3. 3.📡 Which animal finds its way by echoes, like this sensor? (a) a cow (b) a snail (c) a bat (d) a goldfish
  4. 4.📡 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?
  5. 5.📡 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)?
  6. 6.📡 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 26 seconds (in cm)?
  7. 7.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
  8. 8.📡 Which object is hardest for an echo sensor to notice? (a) a wooden box (b) a metal door (c) a flat wall (d) a soft foam cushion
  9. 9.📡 What does an ultrasonic distance sensor send out? (a) water drops (b) radio music (c) bright light (d) sound too high to hear
  10. 10.📡 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?
  11. 11.📡 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) No (b) Yes
  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 140 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 5 seconds (in cm)?
  14. 14.📡 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)?
  15. 15.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 1 km (b) 34 cm (c) 340 cm (d) 3 cm
  16. 16.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
  17. 17.📡 Why do we halve the echo’s total path? (a) it goes there and back (b) to make it smaller (c) sound is slow (d) the sensor is half
  18. 18.📡 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)?
  19. 19.📡 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 5 seconds (in cm)?
  20. 20.📡 A robot is 250 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 8 seconds (in cm)?
  21. 21.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
  22. 22.📡 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?
  23. 23.📡 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?
  24. 24.📡 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)?
  25. 25.📡 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)?
  26. 26.📡 A robot is 300 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 22 seconds (in cm)?
  27. 27.📡 A robot is 170 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)?
  28. 28.📡 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 2 seconds (in cm)?
  29. 29.📡 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)?
  30. 30.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
  31. 31.📡 A robot is 210 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)?
  32. 32.📡 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)?
  33. 33.📡 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 1 second (in cm)?
  34. 34.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
  35. 35.📡 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?
  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 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)?
  38. 38.📡 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?
  39. 39.📡 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 7 seconds (in cm)?
  40. 40.📡 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?

Answer key

  1. 110
  2. 12
  3. a bat
  4. 3
  5. 340
  6. 150
  7. Yes
  8. a soft foam cushion
  9. sound too high to hear
  10. 4
  11. Yes
  12. 136
  13. 90
  14. 51
  15. 34 cm
  16. No
  17. it goes there and back
  18. 68
  19. 75
  20. 170
  21. No
  22. 16
  23. 8
  24. 272
  25. 204
  26. 80
  27. 30
  28. 120
  29. 102
  30. No
  31. 90
  32. 17
  33. 170
  34. No
  35. 14
  36. 20
  37. 34
  38. 19
  39. 50
  40. 1

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