← The distance sensor lesson New set →

Robotics Worksheet: Ultrasonic Distance Sensor

Robotics lesson 17: The distance sensor · Set 877 · 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 1 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
  2. 2.📡 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
  3. 3.📡 What does an ultrasonic distance sensor send out? (a) sound too high to hear (b) water drops (c) radio music (d) bright light
  4. 4.📡 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?
  5. 5.📡 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?
  6. 6.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 340 cm (b) 3 cm (c) 34 cm (d) 1 km
  7. 7.📡 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?
  8. 8.📡 A robot is 260 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)?
  9. 9.📡 Why do we halve the echo’s total path? (a) it goes there and back (b) sound is slow (c) to make it smaller (d) the sensor is half
  10. 10.📡 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?
  11. 11.📡 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
  12. 12.📡 A distance sensor sends a sound pulse and hears the echo 7 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
  13. 13.📡 Which object is hardest for an echo sensor to notice? (a) a metal door (b) a soft foam cushion (c) a wooden box (d) a flat wall
  14. 14.📡 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)?
  15. 15.📡 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?
  16. 16.📡 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)?
  17. 17.📡 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
  18. 18.📡 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 47 seconds (in cm)?
  19. 19.📡 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 10 seconds (in cm)?
  20. 20.📡 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
  21. 21.📡 A robot is 160 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 3 seconds (in cm)?
  22. 22.📡 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)?
  23. 23.📡 A robot is 200 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 8 seconds (in cm)?
  24. 24.📡 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)?
  25. 25.📡 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?
  26. 26.📡 An object is 170 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
  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 230 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)?
  29. 29.📡 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
  30. 30.📡 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
  31. 31.📡 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 3 seconds (in cm)?
  32. 32.📡 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)?
  33. 33.📡 A distance sensor sends a sound pulse and hears the echo 17 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
  34. 34.📡 A distance sensor sends a sound pulse and hears the echo 11 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
  35. 35.📡 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 14 seconds (in cm)?
  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 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)?
  38. 38.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
  39. 39.📡 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 1 second (in cm)?
  40. 40.📡 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 1 second (in cm)?

Answer key

  1. 17
  2. No
  3. sound too high to hear
  4. 17
  5. 19
  6. 34 cm
  7. 8
  8. 40
  9. it goes there and back
  10. 16
  11. No
  12. 119
  13. a soft foam cushion
  14. 306
  15. 15
  16. 68
  17. No
  18. 15
  19. 50
  20. Yes
  21. 145
  22. 34
  23. 80
  24. 255
  25. 1
  26. 10
  27. 51
  28. 100
  29. No
  30. No
  31. 235
  32. 170
  33. 289
  34. 187
  35. 90
  36. 204
  37. 85
  38. Yes
  39. 120
  40. 205

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