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Robotics Worksheet: Ultrasonic Distance Sensor

Robotics lesson 17: The distance sensor · Set 139 · 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 260 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)?
  2. 2.📡 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)?
  3. 3.📡 Why do we halve the echo’s total path? (a) it goes there and back (b) the sensor is half (c) sound is slow (d) to make it smaller
  4. 4.📡 What does an ultrasonic distance sensor send out? (a) water drops (b) radio music (c) bright light (d) sound too high to hear
  5. 5.📡 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)?
  6. 6.📡 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)?
  7. 7.📡 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)?
  8. 8.📡 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)?
  9. 9.📡 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) Yes (b) No
  10. 10.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 3 cm (b) 1 km (c) 340 cm (d) 34 cm
  11. 11.📡 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
  12. 12.📡 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)?
  13. 13.📡 A robot is 100 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 3 seconds (in cm)?
  14. 14.📡 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 8 seconds (in cm)?
  15. 15.📡 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) No (b) Yes
  16. 16.📡 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)?
  17. 17.📡 A robot is 170 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)?
  18. 18.📡 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?
  19. 19.📡 Which object is hardest for an echo sensor to notice? (a) a wooden box (b) a metal door (c) a soft foam cushion (d) a flat wall
  20. 20.📡 Which animal finds its way by echoes, like this sensor? (a) a cow (b) a goldfish (c) a snail (d) a bat
  21. 21.📡 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)?
  22. 22.📡 A robot is 180 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)?
  23. 23.📡 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?
  24. 24.📡 An object is 221 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
  25. 25.📡 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
  26. 26.📡 A robot is 300 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 18 seconds (in cm)?
  27. 27.📡 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 3 seconds (in cm)?
  28. 28.📡 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 42 seconds (in cm)?
  29. 29.📡 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) No (b) Yes
  30. 30.📡 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?
  31. 31.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
  32. 32.📡 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)?
  33. 33.📡 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 26 seconds (in cm)?
  34. 34.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
  35. 35.📡 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?
  36. 36.📡 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) Yes (b) No
  37. 37.📡 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 3 seconds (in cm)?
  38. 38.📡 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 1 second (in cm)?
  39. 39.📡 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
  40. 40.📡 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?

Answer key

  1. 185
  2. 102
  3. it goes there and back
  4. sound too high to hear
  5. 204
  6. 34
  7. 136
  8. 187
  9. No
  10. 34 cm
  11. No
  12. 221
  13. 70
  14. 150
  15. No
  16. 17
  17. 155
  18. 3
  19. a soft foam cushion
  20. a bat
  21. 306
  22. 45
  23. 2
  24. 13
  25. No
  26. 30
  27. 70
  28. 60
  29. No
  30. 19
  31. Yes
  32. 340
  33. 40
  34. Yes
  35. 10
  36. Yes
  37. 190
  38. 280
  39. No
  40. 5

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