Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 921 · 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 servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
2. 2.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times bigger (b) 3 times faster (c) 3 times slower (d) 3 times louder
3. 3.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
4. 4.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
5. 5.⚙️ An 8-tooth driver gear turns a 24-tooth driven gear. The driven gear turns 9 times. How many times did the driver turn?
6. 6.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
7. 7.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 48. What is under the sensor? (a) the white floor (b) the black line
8. 8.⚙️ A motor makes 200 turns a minute with an 8-tooth gear on it. That gear drives a 16-tooth gear. How many turns a minute does the 16-tooth gear make?
9. 9.⚙️ A 15-tooth driver gear turns a 75-tooth driven gear. The driven gear turns 3 times. How many times did the driver turn?
10. 10.🧭 A robot spins 90° every second. How many seconds does it take to turn 90°?
11. 11.True or false: “a flat road” suits propellers. (a) False (b) True
12. 12.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
13. 13.🛞 The diameter of a wheel is how many times its radius? (a) 4 (b) 1 (c) 3 (d) 2
14. 14.⚙️ A common servo can turn from 0° up to about … (a) 10° (b) 180° (c) 1800° (d) 18°
15. 15.⚙️ A small gear drives a big gear. The big gear turns … (a) not at all (b) faster and weaker (c) at the same speed (d) slower but stronger
16. 16.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) big drives small (b) small drives big
17. 17.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 14 cm (use π = 22/7). The motor turns 4 times. How far does the robot roll (in cm)?
18. 18.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True
19. 19.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
20. 20.True or false: “loose sand dunes” suits legs. (a) False (b) True
21. 21.📡 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)?
22. 22.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
23. 23.🧭 What does a gyro help a robot do? (a) see colours (b) turn by exact angles (c) hear claps (d) smell smoke
24. 24.Which of these suits legs? (a) crossing stepping-stones (b) moving under water (c) hovering over a roof (d) a long factory floor
25. 25.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
26. 26.🛞 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
27. 27.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
28. 28.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 135°. Where does the arm point? (a) points straight up (b) points right (c) points up and right (d) points up and left
29. 29.⚙️ Which gear set-up gives this: “the output is weaker”? (a) big drives small (b) small drives big
30. 30.⚙️ An 8-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
31. 31.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
32. 32.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 30 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
33. 33.🧭 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 left 135°, then left 90°. What does the gyro read now (0° to 359°)?
34. 34.True or false: “reverses if wires swap” is true of a DC motor. (a) False (b) True
35. 35.⚙️ Two gears are meshed together. How do they turn? (a) one up, one down (b) they do not turn (c) in opposite directions (d) the same direction
36. 36.🧭 A robot faces north. It does: turn right, turn around, turn around. Which way does it face now? (a) south (b) west (c) north (d) east
37. 37.🔍 Which sensor helps a robot stay balanced upright? (a) a gyro sensor (b) a touch sensor (c) a sound sensor (d) a distance sensor
38. 38.📡 A robot is 100 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 8 seconds (in cm)?
39. 39.⚙️ Which gear set-up gives this: “the output turns faster”? (a) big drives small (b) small drives big
40. 40.⚙️ 7 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 7 turn? (a) clockwise (b) anticlockwise

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