Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 608 · 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 28 cm. Using π = 22/7, what is its circumference (in cm)?
2. 2.⚙️ A 20-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
3. 3.🛞 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)? =
4. 4.🛞 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) spins left on the spot (b) goes straight forward (c) goes straight back (d) turns left
5. 5.⚙️ The gear fixed to the motor is called the … (a) tyre (b) driven gear (c) idler gear (d) driver gear
6. 6.True or false: “the output is weaker” happens when a big gear drives a small one. (a) False (b) True
7. 7.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
8. 8.🛞 How does a two-wheeled robot with no steering turn? (a) one wheel runs faster (b) it stops for ever (c) it jumps (d) it uses a sail
9. 9.🧭 A robot should turn right 90°, but its gyro shows it turned 105°. How many degrees must it turn back to the left?
10. 10.Which of these suits legs? (a) a muddy building site (b) a field of tall boulders (c) moving under water (d) hovering over a roof
11. 11.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
12. 12.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 40 turns a minute and the right wheel at 60 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
13. 13.⚙️ An 8-tooth driver gear turns a 16-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) at the same speed (c) slower
14. 14.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how many full turns must they make to roll 264 cm?
15. 15.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
16. 16.🦾 A servo moves from 20° to 150°. How many degrees does it turn?
17. 17.🧭 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 45°, then right 120°. What does the gyro read now (0° to 359°)?
18. 18.True or false: “the output is stronger” happens when a big gear drives a small one. (a) False (b) True
19. 19.🔍 Why do robots need sensors? (a) to look colourful (b) to be heavier (c) to use more power (d) to know their world
20. 20.🛞 Which way of moving suits this best: “flying over a field”? (a) tracks (b) wheels (c) propellers (d) legs
21. 21.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 33. What is under the sensor? (a) the white floor (b) the black line
22. 22.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
23. 23.🦾 A servo program runs:
    angle = 20
    angle = angle + 20
    angle = angle + 20
    angle = angle − 60
    To what angle (in degrees) does the servo turn in the end?
24. 24.🧭 A robot faces east. It does: turn around, turn right, turn right. Which way does it face now? (a) west (b) south (c) east (d) north
25. 25.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a gear (b) a servo (c) a track (d) a caster wheel
26. 26.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) faster (b) backwards (c) slower (d) nowhere
27. 27.🧭 A robot spins 15° every second. How many seconds does it take to turn 30°?
28. 28.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times louder (b) 3 times faster (c) 3 times slower (d) 3 times bigger
29. 29.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
30. 30.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) small drives big (b) big drives small
31. 31.⚙️ A 15-tooth driver gear turns a 45-tooth driven gear. The driver turns 15 times. How many times does the driven gear turn?
32. 32.⚙️ An 8-tooth driver gear turns a 16-tooth driven gear. The driven gear turns 9 times. How many times did the driver turn?
33. 33.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) never important (b) small (fast, weak) (c) zero (d) big (slow and strong)
34. 34.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
35. 35.🛞 Which way of moving suits this best: “crossing stepping-stones”? (a) wheels (b) legs (c) tracks (d) propellers
36. 36.📡 A distance sensor sends a sound pulse and hears the echo 8 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
37. 37.🧭 A robot faces west. It does: turn right, turn left. Which way does it face now? (a) west (b) south (c) east (d) north
38. 38.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
39. 39.⚙️ A 24-tooth driver gear turns a 30-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) slower (c) at the same speed
40. 40.🔦 A light sensor reads 20 over black and 90 over white. A good threshold is halfway between them. What is it?

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