Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 454 · 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’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)? =
2. 2.⚙️ The gear fixed to the motor is called the … (a) driver gear (b) idler gear (c) tyre (d) driven gear
3. 3.📡 A distance sensor sends a sound pulse and hears the echo 6 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
4. 4.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small
5. 5.🦾 A servo moves from 120° to 40°. How many degrees does it turn?
6. 6.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 15 and the right sensor reads 90. Which sensor is over the black line? (a) the right sensor (b) neither sensor (c) the left sensor (d) both sensors
7. 7.🛞 What is the main difficulty with legs for a robot? (a) they are too cheap (b) too fast on floors (c) they never tire (d) harder to balance
8. 8.🦾 A servo program runs:
   angle = 150
   angle = angle − 10
   angle = angle − 60
   angle = angle − 20
   To what angle (in degrees) does the servo turn in the end?
9. 9.📡 Why do we halve the echo’s total path? (a) the sensor is half (b) it goes there and back (c) to make it smaller (d) sound is slow
10. 10.⚙️ A motor changes electrical energy into … (a) sound only (b) water (c) movement (d) light
11. 11.📡 An object is 306 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
12. 12.🧭 A robot faces west. It does: turn right, turn right, turn left, turn right. Which way does it face now? (a) north (b) south (c) west (d) east
13. 13.⚙️ A big gear drives a small gear. The small gear turns … (a) not at all (b) faster but weaker (c) at the same speed (d) slower but stronger
14. 14.🔍 For a robot’s controller, is a sensor an input or an output? (a) an input (b) an output (c) a wheel (d) a gear
15. 15.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
16. 16.🦾 A servo program runs:
    angle = 20
    angle = angle + 30
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
17. 17.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 4 times (in cm)?
18. 18.True or false: “holds a set angle” is true of a DC motor. (a) True (b) False
19. 19.⬛ A reading below the threshold means the sensor is over … (a) the sky (b) black (c) water (d) white
20. 20.🦾 A servo moves from 130° to 10°. How many degrees does it turn?
21. 21.📡 A robot is 150 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 11 seconds (in cm)?
22. 22.⚙️ A 20-tooth gear drives a 100-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
23. 23.True or false: “has a signal wire” is true of a DC motor. (a) True (b) False
24. 24.🧭 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 left 30°, then left 30°. What does the gyro read now (0° to 359°)?
25. 25.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 17. What is under the sensor? (a) the white floor (b) the black line
26. 26.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they spread the weight (b) they are round (c) they spin in the air (d) they are shiny
27. 27.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) backwards (b) slower (c) nowhere (d) faster
28. 28.True or false: “spins round and round” is true of a servo motor. (a) True (b) False
29. 29.🧭 A robot faces east. It does: turn left, turn right, turn left, turn right. Which way does it face now? (a) north (b) west (c) east (d) south
30. 30.🧭 A robot keeps turning right by 30° at a time. How many turns make one full circle?
31. 31.⚙️ A 20-tooth driver gear turns a 60-tooth driven gear. The driver turns 12 times. How many times does the driven gear turn?
32. 32.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 2 turn? (a) anticlockwise (b) clockwise
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 3 times. How far does the robot roll (in cm)?
34. 34.🔢 Gear ratio = driven teeth ÷ … (a) motor volts (b) driver teeth (c) wheel size (d) number of gears
35. 35.🧭 A robot should turn right 45°, but its gyro shows it turned 37°. How many degrees must it turn more to the right?
36. 36.🛞 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)? =
37. 37.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 85 and the right sensor reads 65. Which sensor is over the black line? (a) the right sensor (b) the left sensor (c) neither sensor (d) both sensors
38. 38.🔦 A light sensor reads 30 over black and 80 over white. A good threshold is halfway between them. What is it?
39. 39.⚙️ A 60-tooth driver gear turns a 20-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
40. 40.⚙️ What are the bumps round the edge of a gear called? (a) tyres (b) pins (c) teeth (d) spokes

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