Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 528 · 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 program runs:
   angle = 30
   angle = angle + 30
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
2. 2.⚙️ A 16-tooth driver gear turns a 15-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) slower (c) faster
3. 3.📡 A robot is 140 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 25 seconds (in cm)?
4. 4.⚙️ DC motor or servo motor: which one has a signal wire? (a) a DC motor (b) a servo motor
5. 5.🔍 For a robot’s controller, is a sensor an input or an output? (a) an input (b) a gear (c) a wheel (d) an output
6. 6.🔍 Which sensor helps a robot stay balanced upright? (a) a gyro sensor (b) a sound sensor (c) a camera (d) a light sensor
7. 7.⚙️ A 10-tooth driver gear turns a 30-tooth driven gear. The driven gear turns 2 times. How many times did the driver turn?
8. 8.⚙️ An 8-tooth gear drives a 32-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
9. 9.True or false: “soft snow” suits propellers. (a) True (b) False
10. 10.📡 A distance sensor sends a sound pulse and hears the echo 15 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
11. 11.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a fan (b) a DC motor (c) a buzzer (d) a servo motor
12. 12.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
13. 13.True or false: “usually turns 0° to 180°” is true of a servo motor. (a) False (b) True
14. 14.🔦 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 white floor (b) the black line
15. 15.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) add more wheels (c) swap its two wires (d) paint it red
16. 16.⚙️ Which gear set-up gives this: “the output is stronger”? (a) big drives small (b) small drives big
17. 17.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
18. 18.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) small drives big (b) big drives small
19. 19.📡 An object is 68 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
20. 20.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 1800° (c) 18° (d) 10°
21. 21.⬛ Why does a light sensor read a LOW number over a black line? (a) black is hot (b) black is wet (c) black is loud (d) black soaks up light
22. 22.🧭 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 180°. It turns right 45°, then right 90°, then left 135°. What does the gyro read now (0° to 359°)?
23. 23.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 100 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
24. 24.🧭 A robot should turn right 45°, but its gyro shows it turned 46°. How many degrees must it turn back to the left?
25. 25.Which job needs a gyro sensor? (a) warn if motors get hot (b) know a button is pressed (c) follow a black line (d) measure a turn angle
26. 26.🛞 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)?
27. 27.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) backwards (b) slower (c) faster (d) nowhere
28. 28.⚙️ A robot fan must spin very fast. The motor’s driver gear meshes with a small gear. What kind of driver gear works best? (a) a big driver gear (b) a small driver gear
29. 29.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 7 times (in cm)?
30. 30.⚙️ 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
31. 31.True or false: “loose sand dunes” suits tracks. (a) True (b) False
32. 32.📡 A robot is 260 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 19 seconds (in cm)?
33. 33.🛞 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?
34. 34.🔍 Which sensor helps a robot find the brightest spot? (a) a distance sensor (b) a sound sensor (c) a light sensor (d) a temperature sensor
35. 35.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
36. 36.🧭 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 180°. It turns right 180°, then right 30°. What does the gyro read now (0° to 359°)?
37. 37.⚙️ A 12-tooth driver gear turns a 60-tooth driven gear. The driver turns 40 times. How many times does the driven gear turn?
38. 38.⚙️ A 10-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
39. 39.Which job needs a touch sensor? (a) follow a black line (b) warn if motors get hot (c) stop before a wall (d) feel a bump into a wall
40. 40.True or false: “moves an arm joint” is true of a servo motor. (a) False (b) True

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