Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 506 · 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.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 3 turn? (a) clockwise (b) anticlockwise
2. 2.⚙️ Which gear set-up gives this: “the output is weaker”? (a) big drives small (b) small drives big
3. 3.🔦 A light sensor reads 10 over black and 80 over white. A good threshold is halfway between them. What is it?
4. 4.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
5. 5.True or false: “good for a fast fan” happens when a small gear drives a big one. (a) False (b) True
6. 6.⚙️ A 10-tooth driver gear turns a 36-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) at the same speed (c) faster
7. 7.⚙️ A 30-tooth driver gear turns a 15-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
8. 8.⚙️ A 15-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
9. 9.🧭 A robot should turn right 45°, but its gyro shows it turned 59°. How many degrees must it turn back to the left?
10. 10.Which of these suits legs? (a) flying over a field (b) a smooth classroom floor (c) a muddy building site (d) crossing stepping-stones
11. 11.Which of these suits wheels? (a) a flat road (b) soft snow (c) deep mud (d) moving under water
12. 12.🧭 A robot keeps turning right by 40° at a time. How many turns make one full circle?
13. 13.📡 An object is 340 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
14. 14.🧭 How many degrees is a right-angle turn? (a) 360° (b) 45° (c) 90° (d) 180°
15. 15.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 40 turns a minute and the right wheel at 30 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the left (c) curves to the right
16. 16.🧭 How many degrees is a full turn? (a) 90° (b) 100° (c) 180° (d) 360°
17. 17.🔍 For a robot’s controller, is a sensor an input or an output? (a) a gear (b) an output (c) an input (d) a wheel
18. 18.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
19. 19.⚙️ A 12-tooth driver gear turns a 48-tooth driven gear. The driven gear turns 1 time. How many times did the driver turn?
20. 20.True or false: “the output is weaker” happens when a big gear drives a small one. (a) True (b) False
21. 21.🔦 A light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?
22. 22.⚙️ A 50-tooth driver gear turns a 10-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?
23. 23.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
24. 24.⚙️ A 10-tooth gear drives a 50-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
25. 25.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 80 turns a minute and the right wheel at 70 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
26. 26.🔍 Which sensor helps a robot feel a bump into a wall? (a) a touch sensor (b) a light sensor (c) a temperature sensor (d) a distance sensor
27. 27.⚙️ A 20-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
28. 28.True or false: to start on a hand clap, use a sound sensor. (a) False (b) True
29. 29.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) big drives small (b) small drives big
30. 30.🛞 A robot’s wheels have a diameter of 5 cm. Using π = 3.14, how far does the robot roll when the wheels turn 2 times (in cm)? =
31. 31.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they spread the weight (b) they are shiny (c) they spin in the air (d) they are round
32. 32.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 180°?
33. 33.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 14 cm (use π = 22/7). The motor turns 12 times. How far does the robot roll (in cm)?
34. 34.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 40 turns a minute and the right wheel at 90 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
35. 35.⬛ A reading below the threshold means the sensor is over … (a) the sky (b) white (c) water (d) black
36. 36.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times louder (b) 3 times faster (c) 3 times bigger (d) 3 times slower
37. 37.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
38. 38.🛞 Which way of moving suits this best: “loose sand dunes”? (a) legs (b) tracks (c) propellers (d) wheels
39. 39.⚙️ A 10-tooth driver gear turns a 30-tooth driven gear. The driven gear turns 7 times. How many times did the driver turn?
40. 40.True or false: “the output turns faster” happens when a big gear drives a small one. (a) False (b) True

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