Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 734 · 40 questions

Robot tip (Find the topic, use the formula): Find the topic: moving, motors, gears, wheels, sensors, echo, line or gyro. Use the rule: teeth × turns; circumference × turns; 17 cm per ms of echo; below the threshold = black; right adds degrees. Check: put your answer back into the rule.

1. 1.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
2. 2.🦾 A servo program runs:
   angle = 40
   angle = angle + 40
   angle = angle − 40
   angle = angle + 60
   To what angle (in degrees) does the servo turn in the end?
3. 3.🛞 Which way of moving suits this best: “a long factory floor”? (a) tracks (b) propellers (c) wheels (d) legs
4. 4.🦾 A servo moves from 20° to 170°. How many degrees does it turn?
5. 5.Which of these suits propellers? (a) a hospital corridor (b) hovering over a roof (c) a flat road (d) loose sand dunes
6. 6.🔢 Gear ratio = driven teeth ÷ … (a) number of gears (b) wheel size (c) motor volts (d) driver teeth
7. 7.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 24. What is under the sensor? (a) the white floor (b) the black line
8. 8.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 14. What is under the sensor? (a) the black line (b) the white floor
9. 9.🧭 A robot faces east. It does: turn left, turn right. Which way does it face now? (a) east (b) north (c) south (d) west
10. 10.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
11. 11.⬛ The threshold of a light sensor is … (a) the top speed (b) the black/white cut-off (c) the battery size (d) the wheel size
12. 12.📡 An object is 68 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 keeps turning right by 60° at a time. How many turns make one full circle?
14. 14.🧭 A robot keeps turning right by 90° at a time. How many turns make one full circle?
15. 15.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
16. 16.🧭 A robot should turn right 180°, but its gyro shows it turned 182°. How many degrees must it turn back to the left?
17. 17.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 7 cm (use π = 22/7). The motor turns 12 times. How far does the robot roll (in cm)?
18. 18.⚙️ A 20-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 7 times. How many times did the driver turn?
19. 19.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 10 and the right sensor reads 80. Which sensor is over the black line? (a) both sensors (b) the left sensor (c) the right sensor (d) neither sensor
20. 20.📡 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?
21. 21.🛞 Why do most indoor robots use wheels? (a) they climb stairs (b) they look funny (c) fast and easy on floors (d) they float
22. 22.⚙️ A 15-tooth gear drives a 75-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
23. 23.⚙️ Two gears are meshed together. How do they turn? (a) in opposite directions (b) one up, one down (c) they do not turn (d) the same direction
24. 24.⚙️ A 20-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
25. 25.🛞 A robot wheel has a diameter of 21 cm. Using π = 22/7, what is its circumference (in cm)?
26. 26.True or false: “good for a slow crane” happens when a big gear drives a small one. (a) True (b) False
27. 27.🛞 A robot’s wheels have a diameter of 20 cm. Using π = 3.14, how far does the robot roll when the wheels turn 1 time (in cm)? =
28. 28.🧭 A robot faces south. It does: turn left, turn left. Which way does it face now? (a) south (b) north (c) west (d) east
29. 29.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 20 turns a minute and the right wheel at 80 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
30. 30.🧭 A robot’s gyro reads 0° when it faces north and counts up to 359° as it turns right (east is 90°). It starts at 180°. It turns left 60°, then left 180°, then left 60°. What does the gyro read now (0° to 359°)?
31. 31.🛞 A robot’s wheels have a diameter of 20 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
32. 32.🔍 Which sensor helps a robot stop before a wall? (a) a light sensor (b) a touch sensor (c) a temperature sensor (d) a distance sensor
33. 33.🔍 Which sensor helps a robot warn if motors get hot? (a) a camera (b) a temperature sensor (c) a light sensor (d) a touch sensor
34. 34.True or false: to know a button is pressed, use a touch sensor. (a) False (b) True
35. 35.📡 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)?
36. 36.Which of these suits tracks? (a) a smooth classroom floor (b) stepping over wide gaps (c) hovering over a roof (d) a muddy building site
37. 37.🛞 A robot’s wheels have a diameter of 6 cm. Using π = 3.14, how far does the robot roll when the wheels turn 5 times (in cm)? =
38. 38.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 21 cm (use π = 22/7). The motor turns 2 times. How far does the robot roll (in cm)?
39. 39.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) zero (b) small (fast, weak) (c) big (slow and strong) (d) never important
40. 40.📡 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)?

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