Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 724 · 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.⚙️ What are the bumps round the edge of a gear called? (a) tyres (b) teeth (c) pins (d) spokes
2. 2.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 42 cm (use π = 22/7). The motor turns 15 times. How far does the robot roll (in cm)?
3. 3.⚙️ A 24-tooth driver gear turns an 8-tooth driven gear. The driver turns 9 times. How many times does the driven gear turn?
4. 4.🦾 A servo program runs:
   angle = 150
   angle = angle − 60
   angle = angle + 50
   angle = angle − 60
   To what angle (in degrees) does the servo turn in the end?
5. 5.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
6. 6.True or false: “deep mud” suits tracks. (a) False (b) True
7. 7.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a servo motor (c) a buzzer (d) a DC motor
8. 8.🛞 The diameter of a wheel is how many times its radius? (a) 3 (b) 2 (c) 4 (d) 1
9. 9.📡 An object is 34 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
10. 10.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 43. What is under the sensor? (a) the black line (b) the white floor
11. 11.📡 Which animal finds its way by echoes, like this sensor? (a) a bat (b) a snail (c) a goldfish (d) a cow
12. 12.Which of these suits propellers? (a) stepping over wide gaps (b) flying over a field (c) a muddy building site (d) a long factory floor
13. 13.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 2 turn? (a) clockwise (b) anticlockwise
14. 14.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
15. 15.🔍 For a robot’s controller, is a sensor an input or an output? (a) an output (b) an input (c) a gear (d) a wheel
16. 16.🧭 How many degrees is a full turn? (a) 90° (b) 180° (c) 360° (d) 100°
17. 17.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
18. 18.🧭 A robot faces north. It does: turn right, turn right, turn around. Which way does it face now? (a) east (b) west (c) north (d) south
19. 19.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 49. What is under the sensor? (a) the black line (b) the white floor
20. 20.📡 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)?
21. 21.⚙️ A motor makes 50 turns a minute with an 8-tooth gear on it. That gear drives a 40-tooth gear. How many turns a minute does the 40-tooth gear make?
22. 22.True or false: “drives the wheels” is true of a DC motor. (a) True (b) False
23. 23.🔦 A light sensor reads 40 over black and 90 over white. A good threshold is halfway between them. What is it?
24. 24.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
25. 25.🛞 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
26. 26.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small
27. 27.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how far does the robot roll when the wheels turn 7 times (in cm)?
28. 28.🦾 A servo moves from 40° to 80°. How many degrees does it turn?
29. 29.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are round (b) they spin in the air (c) they spread the weight (d) they are shiny
30. 30.🛞 Which way of moving suits this best: “a long factory floor”? (a) wheels (b) legs (c) tracks (d) propellers
31. 31.⚙️ A 12-tooth gear drives a 24-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
32. 32.🛞 Which way of moving suits this best: “flying over a field”? (a) tracks (b) wheels (c) propellers (d) legs
33. 33.🔦 A light sensor reads 30 over black and 60 over white. A good threshold is halfway between them. What is it?
34. 34.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 70 turns a minute and the right wheel at 80 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the left (c) curves to the right
35. 35.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 7/22 (b) 22/7 (c) 22 (d) 2/7
36. 36.⚙️ Which gear set-up gives this: “the output is weaker”? (a) small drives big (b) big drives small
37. 37.True or false: “the output turns faster” happens when a big gear drives a small one. (a) True (b) False
38. 38.🔍 Which sensor helps a robot hear a whistle? (a) a touch sensor (b) a temperature sensor (c) a sound sensor (d) a light sensor
39. 39.True or false: to follow a black line, use a light sensor. (a) False (b) True
40. 40.🛞 Which way of moving suits this best: “loose sand dunes”? (a) wheels (b) tracks (c) legs (d) propellers

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