Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 18 · 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 robot wheel has a diameter of 35 cm. Using π = 22/7, what is its circumference (in cm)?
2. 2.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 40 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
3. 3.🛞 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 6 times. How far does the robot roll (in cm)?
4. 4.⚙️ 7 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 7 turn? (a) anticlockwise (b) clockwise
5. 5.⚙️ A 36-tooth driver gear turns a 30-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) faster (c) slower
6. 6.📡 A distance sensor sends a sound pulse and hears the echo 7 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
7. 7.True or false: to know a button is pressed, use a light sensor. (a) True (b) False
8. 8.⚙️ A 15-tooth driver gear turns a 60-tooth driven gear. The driver turns 32 times. How many times does the driven gear turn?
9. 9.⚙️ Pulley A turns clockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
10. 10.⚙️ Which gear set-up gives this: “the output is weaker”? (a) big drives small (b) small drives big
11. 11.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
12. 12.True or false: “a field of tall boulders” suits legs. (a) False (b) True
13. 13.⚙️ A 15-tooth driver gear turns a 45-tooth driven gear. The driver turns 15 times. How many times does the driven gear turn?
14. 14.🔦 A light sensor reads 30 over black and 90 over white. A good threshold is halfway between them. What is it?
15. 15.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 73. What is under the sensor? (a) the black line (b) the white floor
16. 16.⬛ Why does a light sensor read a LOW number over a black line? (a) black is hot (b) black soaks up light (c) black is loud (d) black is wet
17. 17.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 80 and the right sensor reads 95. Which sensor is over the black line? (a) both sensors (b) the right sensor (c) the left sensor (d) neither sensor
18. 18.⚙️ An 8-tooth gear drives a 40-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
19. 19.⚙️ The gear fixed to the motor is called the … (a) tyre (b) driven gear (c) idler gear (d) driver gear
20. 20.🛞 A robot’s wheels have a diameter of 10 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
21. 21.🦾 A servo moves from 70° to 130°. How many degrees does it turn?
22. 22.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how many full turns must they make to roll 330 cm?
23. 23.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how many full turns must they make to roll 132 cm?
24. 24.⚙️ A 12-tooth driver gear turns a 24-tooth driven gear. The driven gear turns 9 times. How many times did the driver turn?
25. 25.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) faster (b) nowhere (c) backwards (d) slower
26. 26.🧭 A robot faces south. It does: turn right, turn around, turn right. Which way does it face now? (a) west (b) north (c) south (d) east
27. 27.📡 A distance sensor sends a sound pulse and hears the echo 16 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
28. 28.🔍 Why do robots need sensors? (a) to be heavier (b) to know their world (c) to look colourful (d) to use more power
29. 29.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
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 90°. It turns right 60°, then left 135°. What does the gyro read now (0° to 359°)?
31. 31.📡 An object is 255 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
32. 32.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 180°. Where does the arm point? (a) points right (b) points straight up (c) points up and right (d) points left
33. 33.🔍 Which sensor helps a robot know a button is pressed? (a) a camera (b) a distance sensor (c) a touch sensor (d) a sound sensor
34. 34.🛞 A robot wheel has a diameter of 21 cm. Using π = 22/7, what is its circumference (in cm)?
35. 35.⚙️ A 15-tooth gear drives a 45-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
36. 36.True or false: “the output turns slower” happens when a big gear drives a small one. (a) False (b) True
37. 37.Which of these suits legs? (a) a smooth classroom floor (b) moving under water (c) a muddy building site (d) crossing stepping-stones
38. 38.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 7/22 (b) 2/7 (c) 22/7 (d) 22
39. 39.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a servo (b) a caster wheel (c) a track (d) a gear
40. 40.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor

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