Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 522 · 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.Which of these suits tracks? (a) moving under water (b) a flat road (c) loose sand dunes (d) a smooth classroom floor
2. 2.🧭 A robot keeps turning right by 90° at a time. How many turns make one full circle?
3. 3.🧭 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 right 45°, then right 60°, then left 90°. What does the gyro read now (0° to 359°)?
4. 4.True or false: “has a signal wire” is true of a servo motor. (a) False (b) True
5. 5.⚙️ A 20-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
6. 6.⚙️ A 20-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
7. 7.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) small drives big (b) big drives small
8. 8.🛞 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 forward. What does the robot do? (a) turns right (b) goes straight forward (c) spins left on the spot (d) turns left
9. 9.True or false: “a hospital corridor” suits wheels. (a) True (b) False
10. 10.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 0°. Where does the arm point? (a) points right (b) points left (c) points up and right (d) points straight up
11. 11.🔦 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) neither sensor (b) both sensors (c) the left sensor (d) the right sensor
12. 12.⚙️ A motor changes electrical energy into … (a) water (b) movement (c) sound only (d) light
13. 13.🧭 How many degrees is a right-angle turn? (a) 360° (b) 45° (c) 90° (d) 180°
14. 14.⚙️ A 36-tooth driver gear turns a 20-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) at the same speed (c) faster
15. 15.🧭 How many degrees is a full turn? (a) 360° (b) 100° (c) 90° (d) 180°
16. 16.🔢 Gear ratio = driven teeth ÷ … (a) driver teeth (b) number of gears (c) wheel size (d) motor volts
17. 17.🛞 Circumference = π × … (a) diameter (b) weight (c) radius only (d) speed
18. 18.Which of these suits wheels? (a) moving under water (b) a long factory floor (c) soft snow (d) a field of tall boulders
19. 19.🛞 A robot’s wheels have a diameter of 8 cm. Using π = 3.14, how far does the robot roll when the wheels turn 4 times (in cm)? =
20. 20.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times bigger (b) 3 times faster (c) 3 times louder (d) 3 times slower
21. 21.🧭 A robot spins 30° every second. How many seconds does it take to turn 360°?
22. 22.⚙️ A 12-tooth driver gear turns a 48-tooth driven gear. The driver turns 16 times. How many times does the driven gear turn?
23. 23.True or false: to know a button is pressed, use a touch sensor. (a) True (b) False
24. 24.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
25. 25.🦾 A servo program runs:
    angle = 170
    angle = angle − 20
    angle = angle − 60
    angle = angle − 10
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
26. 26.⚙️ A robot arm must lift a heavy load slowly. The motor’s driver gear meshes with a big gear. What kind of driver gear works best? (a) a small driver gear (b) a big driver gear
27. 27.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how far does the robot roll when the wheels turn 8 times (in cm)?
28. 28.📡 What does an ultrasonic distance sensor send out? (a) radio music (b) sound too high to hear (c) water drops (d) bright light
29. 29.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
30. 30.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) swap its two wires (c) paint it red (d) shake it
31. 31.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 10 and the right sensor reads 20. Which sensor is over the black line? (a) the right sensor (b) the left sensor (c) both sensors (d) neither sensor
32. 32.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
33. 33.🧭 A robot keeps turning right by 60° at a time. How many turns make one full circle?
34. 34.⚙️ A motor makes 60 turns a minute with an 8-tooth gear on it. That gear drives a 24-tooth gear. How many turns a minute does the 24-tooth gear make?
35. 35.🧭 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 right 60°, then left 135°, then right 180°. What does the gyro read now (0° to 359°)?
36. 36.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) True (b) False
37. 37.🧭 A robot spins 30° every second. How many seconds does it take to turn 90°?
38. 38.🛞 A robot wheel has a diameter of 21 cm. Using π = 22/7, what is its circumference (in cm)?
39. 39.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
40. 40.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a sound sensor (b) a camera (c) a gyro sensor (d) a touch sensor

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