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Robotics Worksheet: Ultrasonic Distance Sensor

Robotics lesson 17: The distance sensor · Set 40 · 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.

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  1. 1.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 1 km (b) 34 cm (c) 340 cm (d) 3 cm
  2. 2.📡 A robot is 180 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)?
  3. 3.📡 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)?
  4. 4.📡 Which object is hardest for an echo sensor to notice? (a) a wooden box (b) a flat wall (c) a soft foam cushion (d) a metal door
  5. 5.📡 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 7 seconds (in cm)?
  6. 6.📡 What does an ultrasonic distance sensor send out? (a) sound too high to hear (b) water drops (c) bright light (d) radio music
  7. 7.📡 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 6 seconds (in cm)?
  8. 8.📡 A robot is 100 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 13 seconds (in cm)?
  9. 9.📡 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 6 seconds (in cm)?
  10. 10.📡 A robot is 140 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 10 seconds (in cm)?
  11. 11.📡 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)?
  12. 12.📡 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?
  13. 13.📡 A robot is 140 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 2 seconds (in cm)?
  14. 14.📡 Why do we halve the echo’s total path? (a) sound is slow (b) it goes there and back (c) the sensor is half (d) to make it smaller
  15. 15.📡 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)?
  16. 16.📡 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
  17. 17.📡 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?
  18. 18.📡 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
  19. 19.📡 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
  20. 20.📡 An object is 306 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
  21. 21.📡 Which animal finds its way by echoes, like this sensor? (a) a snail (b) a goldfish (c) a bat (d) a cow
  22. 22.📡 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)?
  23. 23.📡 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)?
  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 24 seconds (in cm)?
  25. 25.📡 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?
  26. 26.📡 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?
  27. 27.📡 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
  28. 28.📡 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?
  29. 29.📡 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)?
  30. 30.📡 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
  31. 31.📡 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)?
  32. 32.📡 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?
  33. 33.📡 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)?
  34. 34.📡 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)?
  35. 35.📡 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) Yes (b) No
  36. 36.📡 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)?
  37. 37.📡 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?
  38. 38.📡 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 4 seconds (in cm)?
  39. 39.📡 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 6 seconds (in cm)?
  40. 40.📡 A robot is 130 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 6 seconds (in cm)?

Answer key

  1. 34 cm
  2. 60
  3. 238
  4. a soft foam cushion
  5. 95
  6. sound too high to hear
  7. 50
  8. 35
  9. 10
  10. 40
  11. 187
  12. 2
  13. 130
  14. it goes there and back
  15. 51
  16. No
  17. 7
  18. No
  19. No
  20. 18
  21. a bat
  22. 85
  23. 68
  24. 100
  25. 11
  26. 6
  27. No
  28. 5
  29. 136
  30. No
  31. 221
  32. 10
  33. 34
  34. 17
  35. No
  36. 306
  37. 19
  38. 80
  39. 70
  40. 100

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