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Robotics Worksheet: Ultrasonic Distance Sensor

Robotics lesson 17: The distance sensor · Set 438 · 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 170 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 4 seconds (in cm)?
  2. 2.📡 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) No (b) Yes
  3. 3.📡 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?
  4. 4.📡 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?
  5. 5.📡 Why do we halve the echo’s total path? (a) the sensor is half (b) sound is slow (c) to make it smaller (d) it goes there and back
  6. 6.📡 What does an ultrasonic distance sensor send out? (a) radio music (b) sound too high to hear (c) water drops (d) bright light
  7. 7.📡 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 3 seconds (in cm)?
  8. 8.📡 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)?
  9. 9.📡 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
  10. 10.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 340 cm (b) 34 cm (c) 3 cm (d) 1 km
  11. 11.📡 A robot is 300 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 8 seconds (in cm)?
  12. 12.📡 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) Yes (b) No
  13. 13.📡 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)?
  14. 14.📡 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)?
  15. 15.📡 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)?
  16. 16.📡 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?
  17. 17.📡 Which animal finds its way by echoes, like this sensor? (a) a bat (b) a cow (c) a snail (d) a goldfish
  18. 18.📡 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)?
  19. 19.📡 A distance sensor sends a sound pulse and hears the echo 14 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
  20. 20.📡 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
  21. 21.📡 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)?
  22. 22.📡 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)?
  23. 23.📡 A robot is 110 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)?
  24. 24.📡 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 11 seconds (in cm)?
  25. 25.📡 A robot is 180 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)?
  26. 26.📡 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)?
  27. 27.📡 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
  28. 28.📡 Which object is hardest for an echo sensor to notice? (a) a soft foam cushion (b) a flat wall (c) a metal door (d) a wooden box
  29. 29.📡 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?
  30. 30.📡 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
  31. 31.📡 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) Yes (b) No
  32. 32.📡 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) Yes (b) No
  33. 33.📡 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
  34. 34.📡 A robot is 290 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 2 seconds (in cm)?
  35. 35.📡 A robot is 210 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 11 seconds (in cm)?
  36. 36.📡 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)?
  37. 37.📡 A robot is 240 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)?
  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 stops if an object is closer than 30 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
  40. 40.📡 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)?

Answer key

  1. 150
  2. Yes
  3. 7
  4. 6
  5. it goes there and back
  6. sound too high to hear
  7. 75
  8. 255
  9. No
  10. 34 cm
  11. 260
  12. Yes
  13. 102
  14. 110
  15. 323
  16. 11
  17. a bat
  18. 17
  19. 238
  20. Yes
  21. 187
  22. 289
  23. 80
  24. 15
  25. 160
  26. 340
  27. No
  28. a soft foam cushion
  29. 17
  30. Yes
  31. No
  32. No
  33. No
  34. 250
  35. 155
  36. 68
  37. 15
  38. 19
  39. No
  40. 85

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