Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 780 · 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 30°?
2. 2.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
3. 3.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
4. 4.🦾 A servo program runs:
   angle = 100
   angle = angle + 30
   angle = angle − 20
   angle = angle − 20
   angle = angle − 20
   To what angle (in degrees) does the servo turn in the end?
5. 5.🔢 Gear ratio = driven teeth ÷ … (a) number of gears (b) driver teeth (c) motor volts (d) wheel size
6. 6.🧭 A robot should turn right 45°, but its gyro shows it turned 40°. How many degrees must it turn more to the right?
7. 7.📡 A distance sensor sends a sound pulse and hears the echo 17 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
8. 8.🔍 Which sensor helps a robot find the brightest spot? (a) a camera (b) a gyro sensor (c) a distance sensor (d) a light sensor
9. 9.🛞 How far does a wheel roll in one full turn? (a) its weight (b) its diameter (c) its circumference (d) its radius
10. 10.True or false: “spins faster with more V” is true of a servo motor. (a) False (b) True
11. 11.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 30 turns a minute and the right wheel at 20 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
12. 12.🛞 Which way of moving suits this best: “a long factory floor”? (a) wheels (b) propellers (c) legs (d) tracks
13. 13.📡 An object is 85 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
14. 14.🧭 A robot should turn right 90°, but its gyro shows it turned 99°. How many degrees must it turn back to the left?
15. 15.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a caster wheel (b) a servo (c) a track (d) a gear
16. 16.Which of these suits wheels? (a) flying over a field (b) moving under water (c) a flat road (d) soft snow
17. 17.🔍 Which sensor helps a robot stop before a wall? (a) a distance sensor (b) a camera (c) a sound sensor (d) a gyro sensor
18. 18.🦾 A servo moves from 80° to 110°. How many degrees does it turn?
19. 19.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how far does the robot roll when the wheels turn 2 times (in cm)?
20. 20.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 340 cm (b) 3 cm (c) 34 cm (d) 1 km
21. 21.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a DC motor (b) a servo motor
22. 22.📡 A distance sensor sends a sound pulse and hears the echo 4 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
23. 23.Which of these suits wheels? (a) deep mud (b) a muddy building site (c) a smooth classroom floor (d) loose sand dunes
24. 24.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
25. 25.📡 A robot is 100 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 6 seconds (in cm)?
26. 26.⚙️ A big gear drives a small gear. The small gear turns … (a) faster but weaker (b) not at all (c) at the same speed (d) slower but stronger
27. 27.⚙️ Which gear set-up gives this: “the output turns faster”? (a) small drives big (b) big drives small
28. 28.🧭 A robot keeps turning right by 60° at a time. How many turns make one full circle?
29. 29.⚙️ A 32-tooth driver gear turns an 8-tooth driven gear. The driver turns 1 time. How many times does the driven gear turn?
30. 30.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 0°. Where does the arm point? (a) points up and right (b) points right (c) points up and left (d) points straight up
31. 31.🧭 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 right 180°. What does the gyro read now (0° to 359°)?
32. 32.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a DC motor (b) a buzzer (c) a servo motor (d) a light sensor
33. 33.🦾 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 right (b) points left (c) points up and right (d) points up and left
34. 34.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
35. 35.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small
36. 36.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
37. 37.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor is stopped. What does the robot do? (a) goes straight back (b) turns right (c) goes straight forward (d) spins right on the spot
38. 38.🔦 A light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?
39. 39.True or false: to find the brightest spot, use a temperature sensor. (a) True (b) False
40. 40.📡 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)?

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