Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 205 · 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.True or false: “moves an arm joint” is true of a servo motor. (a) True (b) False
2. 2.⬛ A reading below the threshold means the sensor is over … (a) water (b) the sky (c) white (d) black
3. 3.📡 A robot is 110 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 14 seconds (in cm)?
4. 4.🦾 A servo moves from 0° to 130°. How many degrees does it turn?
5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
6. 6.🔍 Why do robots need sensors? (a) to be heavier (b) to know their world (c) to use more power (d) to look colourful
7. 7.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
8. 8.⚙️ A 15-tooth driver gear turns a 30-tooth driven gear. The driven gear turns 2 times. How many times did the driver turn?
9. 9.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
10. 10.⚙️ A motor makes 120 turns a minute with a 12-tooth gear on it. That gear drives a 48-tooth gear. How many turns a minute does the 48-tooth gear make?
11. 11.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 3 turn? (a) clockwise (b) anticlockwise
12. 12.⚙️ A robot arm must lift a heavy load slowly. The motor’s driver gear meshes with a big gear. What kind of driver gear works best? (a) a big driver gear (b) a small driver gear
13. 13.True or false: “flying over a field” suits propellers. (a) True (b) False
14. 14.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 40. What is under the sensor? (a) the black line (b) the white floor
15. 15.🧭 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 120°. What does the gyro read now (0° to 359°)?
16. 16.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
17. 17.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 40 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
18. 18.⚙️ Two gears are meshed together. How do they turn? (a) in opposite directions (b) one up, one down (c) the same direction (d) they do not turn
19. 19.🛞 Why do most indoor robots use wheels? (a) they look funny (b) they float (c) they climb stairs (d) fast and easy on floors
20. 20.📡 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)?
21. 21.🛞 A robot’s wheels have a diameter of 20 cm. Using π = 3.14, how far does the robot roll when the wheels turn 4 times (in cm)? =
22. 22.Which job needs a touch sensor? (a) warn if motors get hot (b) stay balanced upright (c) follow a black line (d) know a button is pressed
23. 23.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
24. 24.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 30 turns a minute and the right wheel at 10 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
25. 25.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 70 turns a minute and the right wheel at 20 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
26. 26.🧭 A robot spins 15° every second. How many seconds does it take to turn 120°?
27. 27.⚙️ A 12-tooth driver gear turns a 10-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) faster (c) slower
28. 28.True or false: “the output is stronger” happens when a small gear drives a big one. (a) True (b) False
29. 29.⚙️ A small gear drives a big gear. The big gear turns … (a) slower but stronger (b) not at all (c) at the same speed (d) faster and weaker
30. 30.🛞 What is the main difficulty with legs for a robot? (a) harder to balance (b) they never tire (c) they are too cheap (d) too fast on floors
31. 31.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a DC motor (b) a servo motor
32. 32.🛞 How far does a wheel roll in one full turn? (a) its radius (b) its circumference (c) its diameter (d) its weight
33. 33.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) small drives big (b) big drives small
34. 34.🔍 Which sensor helps a robot warn if motors get hot? (a) a temperature sensor (b) a gyro sensor (c) a camera (d) a touch sensor
35. 35.📡 An object is 102 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
36. 36.Which of these suits legs? (a) a long factory floor (b) soft snow (c) stepping over wide gaps (d) deep mud
37. 37.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 20 turns a minute and the right wheel at 20 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
38. 38.🛞 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) turns right (b) turns left (c) goes straight forward (d) stays still
39. 39.⚙️ A motor changes electrical energy into … (a) light (b) movement (c) sound only (d) water
40. 40.Which job needs a camera? (a) stay balanced upright (b) spot a red ball (c) know a button is pressed (d) feel a bump into a wall

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