Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 227 · 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 light sensor reads 10 over black and 90 over white. A good threshold is halfway between them. What is it?
2. 2.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a camera (b) a sound sensor (c) a touch sensor (d) a gyro sensor
3. 3.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) faster (b) slower (c) nowhere (d) backwards
4. 4.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
5. 5.⚙️ An 8-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
6. 6.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
7. 7.🦾 A servo program runs:
   angle = 30
   angle = angle − 10
   angle = angle − 20
   angle = angle + 30
   angle = angle − 10
   To what angle (in degrees) does the servo turn in the end?
8. 8.🔍 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
9. 9.⚙️ A 15-tooth driver gear turns a 45-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?
10. 10.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a buzzer (b) a servo motor (c) a DC motor (d) a fan
11. 11.⚙️ 7 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 7 turn? (a) anticlockwise (b) clockwise
12. 12.⚙️ A motor changes electrical energy into … (a) light (b) sound only (c) water (d) movement
13. 13.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a gear (b) a track (c) a caster wheel (d) a servo
14. 14.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 80 turns a minute and the right wheel at 60 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
15. 15.Which job needs a sound sensor? (a) know a button is pressed (b) find the brightest spot (c) hear a whistle (d) feel a bump into a wall
16. 16.📡 Which object is hardest for an echo sensor to notice? (a) a soft foam cushion (b) a wooden box (c) a flat wall (d) a metal door
17. 17.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 22 (b) 7/22 (c) 2/7 (d) 22/7
18. 18.🧭 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 0°. It turns right 90°, then right 135°, then left 30°. What does the gyro read now (0° to 359°)?
19. 19.🦾 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 straight up (b) points up and right (c) points right (d) points up and left
20. 20.🧭 How many degrees is a right-angle turn? (a) 180° (b) 90° (c) 45° (d) 360°
21. 21.True or false: to follow a black line, use a distance sensor. (a) False (b) True
22. 22.🛞 What is the main difficulty with legs for a robot? (a) too fast on floors (b) harder to balance (c) they never tire (d) they are too cheap
23. 23.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
24. 24.📡 A robot is 300 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 56 seconds (in cm)?
25. 25.🛞 Which way of moving suits this best: “a muddy building site”? (a) wheels (b) propellers (c) legs (d) tracks
26. 26.🧭 How many degrees is a half turn (turn around)? (a) 45° (b) 90° (c) 180° (d) 360°
27. 27.🛞 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 forward (b) spins left on the spot (c) turns right (d) spins right on the spot
28. 28.🛞 How far does a wheel roll in one full turn? (a) its diameter (b) its radius (c) its circumference (d) its weight
29. 29.⚙️ Two gears are meshed together. How do they turn? (a) the same direction (b) in opposite directions (c) they do not turn (d) one up, one down
30. 30.⚙️ A 20-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
31. 31.🧭 A robot spins 90° every second. How many seconds does it take to turn 360°?
32. 32.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 95 and the right sensor reads 70. Which sensor is over the black line? (a) the right sensor (b) both sensors (c) neither sensor (d) the left sensor
33. 33.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 75 and the right sensor reads 95. Which sensor is over the black line? (a) neither sensor (b) both sensors (c) the left sensor (d) the right sensor
34. 34.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor runs forward. What does the robot do? (a) spins left on the spot (b) turns left (c) spins right on the spot (d) goes straight forward
35. 35.⚙️ How do you make a DC motor spin the other way? (a) add more wheels (b) swap its two wires (c) paint it red (d) shake it
36. 36.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
37. 37.Which of these suits tracks? (a) a flat road (b) flying over a field (c) hovering over a roof (d) soft snow
38. 38.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
39. 39.⚙️ A motor makes 270 turns a minute with a 12-tooth gear on it. That gear drives a 36-tooth gear. How many turns a minute does the 36-tooth gear make?
40. 40.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False

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