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Robotics Worksheet: Ultrasonic Distance Sensor

Robotics lesson 17: The distance sensor · Set 203 · 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 130 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)?
  2. 2.📡 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?
  3. 3.📡 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 2 seconds (in cm)?
  4. 4.📡 Which object is hardest for an echo sensor to notice? (a) a metal door (b) a flat wall (c) a soft foam cushion (d) a wooden box
  5. 5.📡 A robot is 120 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)?
  6. 6.📡 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
  7. 7.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 1 km (b) 34 cm (c) 3 cm (d) 340 cm
  8. 8.📡 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 28 seconds (in cm)?
  9. 9.📡 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) Yes (b) No
  10. 10.📡 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?
  11. 11.📡 Which animal finds its way by echoes, like this sensor? (a) a cow (b) a snail (c) a bat (d) a goldfish
  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.📡 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
  14. 14.📡 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
  15. 15.📡 What does an ultrasonic distance sensor send out? (a) water drops (b) sound too high to hear (c) radio music (d) bright light
  16. 16.📡 Why do we halve the echo’s total path? (a) the sensor is half (b) it goes there and back (c) to make it smaller (d) sound is slow
  17. 17.📡 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 15 seconds (in cm)?
  18. 18.📡 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) No (b) Yes
  19. 19.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
  20. 20.📡 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?
  21. 21.📡 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 38 seconds (in cm)?
  22. 22.📡 A robot is 140 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 7 seconds (in cm)?
  23. 23.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
  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.📡 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)?
  26. 26.📡 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)?
  27. 27.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
  28. 28.📡 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)?
  29. 29.📡 A robot is 120 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)?
  30. 30.📡 A robot is 210 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 13 seconds (in cm)?
  31. 31.📡 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)?
  32. 32.📡 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?
  33. 33.📡 A robot is 190 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)?
  34. 34.📡 A robot is 110 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)?
  35. 35.📡 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) Yes (b) No
  36. 36.📡 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 27 seconds (in cm)?
  37. 37.📡 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?
  38. 38.📡 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)?
  39. 39.📡 A robot is 220 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)?
  40. 40.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No

Answer key

  1. 110
  2. 11
  3. 140
  4. a soft foam cushion
  5. 105
  6. Yes
  7. 34 cm
  8. 10
  9. Yes
  10. 8
  11. a bat
  12. 119
  13. Yes
  14. No
  15. sound too high to hear
  16. it goes there and back
  17. 65
  18. Yes
  19. Yes
  20. 19
  21. 30
  22. 35
  23. No
  24. 255
  25. 68
  26. 323
  27. No
  28. 306
  29. 100
  30. 80
  31. 170
  32. 14
  33. 50
  34. 60
  35. No
  36. 20
  37. 13
  38. 85
  39. 140
  40. No

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