← The distance sensor lesson New set →

Robotics Worksheet: Ultrasonic Distance Sensor

Robotics lesson 17: The distance sensor · Set 916 · 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 4 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
  2. 2.📡 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 6 seconds (in cm)?
  3. 3.📡 Which object is hardest for an echo sensor to notice? (a) a soft foam cushion (b) a flat wall (c) a wooden box (d) a metal door
  4. 4.📡 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)?
  5. 5.📡 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
  6. 6.📡 A robot is 220 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)?
  7. 7.📡 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)?
  8. 8.📡 An object is 119 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
  9. 9.📡 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 10 seconds (in cm)?
  10. 10.📡 What does an ultrasonic distance sensor send out? (a) water drops (b) bright light (c) sound too high to hear (d) radio music
  11. 11.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 3 cm (b) 340 cm (c) 34 cm (d) 1 km
  12. 12.📡 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
  13. 13.📡 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 12 seconds (in cm)?
  14. 14.📡 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?
  15. 15.📡 A robot is 270 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)?
  16. 16.📡 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)?
  17. 17.📡 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)?
  18. 18.📡 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?
  19. 19.📡 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?
  20. 20.📡 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)?
  21. 21.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 5 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
  22. 22.📡 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)?
  23. 23.📡 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) No (b) Yes
  24. 24.📡 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 20 seconds (in cm)?
  25. 25.📡 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
  26. 26.📡 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)?
  27. 27.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
  28. 28.📡 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
  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 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
  31. 31.📡 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)?
  32. 32.📡 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 15 seconds (in cm)?
  33. 33.📡 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)?
  34. 34.📡 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 22 seconds (in cm)?
  35. 35.📡 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) No (b) Yes
  36. 36.📡 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?
  37. 37.📡 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
  38. 38.📡 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?
  39. 39.📡 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)?
  40. 40.📡 A robot is 270 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 21 seconds (in cm)?

Answer key

  1. 68
  2. 20
  3. a soft foam cushion
  4. 136
  5. it goes there and back
  6. 120
  7. 204
  8. 7
  9. 150
  10. sound too high to hear
  11. 34 cm
  12. Yes
  13. 10
  14. 14
  15. 255
  16. 85
  17. 255
  18. 20
  19. 6
  20. 323
  21. No
  22. 306
  23. No
  24. 120
  25. No
  26. 51
  27. No
  28. No
  29. 102
  30. No
  31. 272
  32. 85
  33. 221
  34. 180
  35. No
  36. 8
  37. Yes
  38. 4
  39. 119
  40. 165

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