Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 841 · 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.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a DC motor (b) a servo motor
2. 2.⚙️ A 20-tooth gear drives an 80-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
3. 3.⚙️ What are the bumps round the edge of a gear called? (a) teeth (b) tyres (c) pins (d) spokes
4. 4.🛞 What is the main difficulty with legs for a robot? (a) they are too cheap (b) harder to balance (c) too fast on floors (d) they never tire
5. 5.🛞 Why do most indoor robots use wheels? (a) they look funny (b) they climb stairs (c) fast and easy on floors (d) they float
6. 6.⚙️ A 15-tooth driver gear turns a 75-tooth driven gear. The driver turns 10 times. How many times does the driven gear turn?
7. 7.⚙️ A 20-tooth driver gear turns a 100-tooth driven gear. The driver turns 25 times. How many times does the driven gear turn?
8. 8.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 62. What is under the sensor? (a) the white floor (b) the black line
9. 9.⚙️ A 10-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
10. 10.🛞 Which way of moving suits this best: “loose sand dunes”? (a) legs (b) propellers (c) tracks (d) wheels
11. 11.Which job needs a gyro sensor? (a) spot a red ball (b) start on a hand clap (c) measure how far a box is (d) measure a turn angle
12. 12.⚙️ 7 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 7 turn? (a) anticlockwise (b) clockwise
13. 13.📡 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)?
14. 14.🦾 A servo moves from 80° to 100°. How many degrees does it turn?
15. 15.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a servo motor (c) a buzzer (d) a fan
16. 16.🧭 A robot should turn right 45°, but its gyro shows it turned 35°. How many degrees must it turn more to the right?
17. 17.🛞 How far does a wheel roll in one full turn? (a) its weight (b) its radius (c) its diameter (d) its circumference
18. 18.🛞 Which way of moving suits this best: “a long factory floor”? (a) legs (b) propellers (c) wheels (d) tracks
19. 19.⚙️ Pulley A turns anticlockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
20. 20.⚙️ A motor makes 480 turns a minute with a 20-tooth gear on it. That gear drives an 80-tooth gear. How many turns a minute does the 80-tooth gear make?
21. 21.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a DC motor (c) a buzzer (d) a light sensor
22. 22.🦾 A servo program runs:
    angle = 150
    angle = angle − 60
    angle = angle − 60
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
23. 23.🔍 Which sensor helps a robot know a button is pressed? (a) a temperature sensor (b) a touch sensor (c) a distance sensor (d) a sound sensor
24. 24.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 70 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
25. 25.True or false: “the output turns faster” happens when a small gear drives a big one. (a) True (b) False
26. 26.⚙️ A 75-tooth driver gear turns a 15-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?
27. 27.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
28. 28.🛞 A robot’s wheels have a diameter of 5 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
29. 29.🦾 A servo program runs:
    angle = 120
    angle = angle − 20
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
30. 30.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) small drives big (b) big drives small
31. 31.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 39. What is under the sensor? (a) the black line (b) the white floor
32. 32.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
33. 33.📡 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)?
34. 34.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 60 and the right sensor reads 20. Which sensor is over the black line? (a) the left sensor (b) the right sensor (c) neither sensor (d) both sensors
35. 35.⚙️ A 15-tooth driver gear turns a 75-tooth driven gear. The driven gear turns 10 times. How many times did the driver turn?
36. 36.⬛ A reading below the threshold means the sensor is over … (a) black (b) the sky (c) water (d) white
37. 37.True or false: “the output turns faster” happens when a big gear drives a small one. (a) False (b) True
38. 38.🛞 Which way of moving suits this best: “crossing stepping-stones”? (a) propellers (b) wheels (c) legs (d) tracks
39. 39.⚙️ A motor changes electrical energy into … (a) light (b) movement (c) sound only (d) water
40. 40.⚙️ A big gear drives a small gear. The small gear turns … (a) at the same speed (b) slower but stronger (c) not at all (d) faster but weaker

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