Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 869 · 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.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
2. 2.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
3. 3.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
4. 4.⚙️ A 12-tooth gear drives a 48-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
5. 5.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) zero (b) never important (c) big (slow and strong) (d) small (fast, weak)
6. 6.🧭 A robot faces west. It does: turn left, turn left. Which way does it face now? (a) south (b) west (c) east (d) north
7. 7.🛞 What is the main difficulty with legs for a robot? (a) harder to balance (b) they are too cheap (c) they never tire (d) too fast on floors
8. 8.True or false: to follow a black line, use a light sensor. (a) False (b) True
9. 9.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs backward and the right motor runs backward. What does the robot do? (a) goes straight forward (b) goes straight back (c) spins left on the spot (d) turns left
10. 10.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how far does the robot roll when the wheels turn 10 times (in cm)?
11. 11.Which of these suits tracks? (a) soft snow (b) a smooth classroom floor (c) a long factory floor (d) a flat road
12. 12.🛞 A robot’s wheels have a diameter of 6 cm. Using π = 3.14, how far does the robot roll when the wheels turn 2 times (in cm)? =
13. 13.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 70 and the right sensor reads 30. Which sensor is over the black line? (a) the left sensor (b) neither sensor (c) both sensors (d) the right sensor
14. 14.🔦 A light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?
15. 15.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 65. What is under the sensor? (a) the white floor (b) the black line
16. 16.📡 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)?
17. 17.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a buzzer (c) a servo motor (d) a light sensor
18. 18.⬛ A reading below the threshold means the sensor is over … (a) white (b) the sky (c) water (d) black
19. 19.📡 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
20. 20.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 100 turns a minute and the right wheel at 20 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
21. 21.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
22. 22.True or false: “the output turns faster” happens when a small gear drives a big one. (a) True (b) False
23. 23.True or false: to start on a hand clap, use a light sensor. (a) False (b) True
24. 24.True or false: “the output turns slower” happens when a big gear drives a small one. (a) False (b) True
25. 25.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) nowhere (b) backwards (c) slower (d) faster
26. 26.🧭 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 0°. It turns left 60°, then left 30°. What does the gyro read now (0° to 359°)?
27. 27.🦾 A servo program runs:
    angle = 180
    angle = angle − 30
    angle = angle + 10
    To what angle (in degrees) does the servo turn in the end?
28. 28.🧭 A robot should turn right 45°, but its gyro shows it turned 46°. How many degrees must it turn back to the left?
29. 29.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 3 turn? (a) anticlockwise (b) clockwise
30. 30.🛞 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 8 times. How far does the robot roll (in cm)?
31. 31.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 65 and the right sensor reads 15. Which sensor is over the black line? (a) neither sensor (b) the left sensor (c) the right sensor (d) both sensors
32. 32.True or false: “the output is weaker” happens when a big gear drives a small one. (a) False (b) True
33. 33.🔢 Gear ratio = driven teeth ÷ … (a) motor volts (b) driver teeth (c) wheel size (d) number of gears
34. 34.🧭 A robot spins 90° every second. How many seconds does it take to turn 360°?
35. 35.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 90 turns a minute and the right wheel at 30 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
36. 36.⚙️ A 40-tooth driver gear turns a 10-tooth driven gear. The driver turns 5 times. How many times does the driven gear turn?
37. 37.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 15 and the right sensor reads 15. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) both sensors (d) the left sensor
38. 38.🧭 How many degrees is a right-angle turn? (a) 180° (b) 45° (c) 90° (d) 360°
39. 39.🔦 A light sensor reads 30 over black and 70 over white. A good threshold is halfway between them. What is it?
40. 40.⬛ Why does a light sensor read a LOW number over a black line? (a) black is wet (b) black is loud (c) black is hot (d) black soaks up light

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