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Robotics Worksheet: Ultrasonic Distance Sensor

Robotics lesson 17: The distance sensor · Set 220 · 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 190 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 9 seconds (in cm)?
  2. 2.📡 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)?
  3. 3.📡 Why do we halve the echo’s total path? (a) it goes there and back (b) to make it smaller (c) the sensor is half (d) sound is slow
  4. 4.📡 What does an ultrasonic distance sensor send out? (a) bright light (b) sound too high to hear (c) radio music (d) water drops
  5. 5.📡 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) Yes (b) No
  6. 6.📡 A robot is 100 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)?
  7. 7.📡 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?
  8. 8.📡 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)?
  9. 9.📡 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
  10. 10.📡 A robot is 100 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)?
  11. 11.📡 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)?
  12. 12.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
  13. 13.📡 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) No (b) Yes
  14. 14.📡 Which object is hardest for an echo sensor to notice? (a) a soft foam cushion (b) a wooden box (c) a metal door (d) a flat wall
  15. 15.📡 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?
  16. 16.📡 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)?
  17. 17.📡 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?
  18. 18.📡 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 35 seconds (in cm)?
  19. 19.📡 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?
  20. 20.📡 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?
  21. 21.📡 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)?
  22. 22.📡 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)?
  23. 23.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 5 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
  24. 24.📡 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
  25. 25.📡 An object is 272 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
  26. 26.📡 A robot is 240 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 1 second (in cm)?
  27. 27.📡 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)?
  28. 28.📡 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) No (b) Yes
  29. 29.📡 A distance sensor sends a sound pulse and hears the echo 9 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
  30. 30.📡 Which animal finds its way by echoes, like this sensor? (a) a cow (b) a goldfish (c) a bat (d) a snail
  31. 31.📡 An object is 255 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
  32. 32.📡 A robot is 110 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)?
  33. 33.📡 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?
  34. 34.📡 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)?
  35. 35.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
  36. 36.📡 A robot is 110 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)?
  37. 37.📡 A robot is 250 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 2 seconds (in cm)?
  38. 38.📡 Which animal finds its way by echoes, like this sensor? (a) a snail (b) a bat (c) a cow (d) a goldfish
  39. 39.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 1 km (b) 340 cm (c) 3 cm (d) 34 cm
  40. 40.📡 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) Yes (b) No

Answer key

  1. 100
  2. 85
  3. it goes there and back
  4. sound too high to hear
  5. Yes
  6. 60
  7. 6
  8. 289
  9. No
  10. 80
  11. 102
  12. No
  13. No
  14. a soft foam cushion
  15. 3
  16. 68
  17. 5
  18. 115
  19. 7
  20. 20
  21. 34
  22. 187
  23. No
  24. No
  25. 16
  26. 235
  27. 51
  28. Yes
  29. 153
  30. a bat
  31. 15
  32. 70
  33. 10
  34. 119
  35. No
  36. 10
  37. 230
  38. a bat
  39. 34 cm
  40. Yes

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