Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 638 · 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 20-tooth driver gear turns an 80-tooth driven gear. The driven gear turns 4 times. How many times did the driver turn?
2. 2.🛞 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) turns right (b) goes straight back (c) turns left (d) goes straight forward
3. 3.🦾 A servo program runs:
   angle = 160
   angle = angle − 50
   angle = angle − 40
   To what angle (in degrees) does the servo turn in the end?
4. 4.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
6. 6.🧭 A robot spins 15° every second. How many seconds does it take to turn 255°?
7. 7.📡 A robot is 290 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 7 seconds (in cm)?
8. 8.Which job needs a temperature sensor? (a) read a QR code (b) follow a black line (c) measure how far a box is (d) warn if motors get hot
9. 9.🛞 Which way of moving suits this best: “a hospital corridor”? (a) propellers (b) tracks (c) wheels (d) legs
10. 10.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
11. 11.🛞 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)? =
12. 12.📡 A robot is 180 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 5 seconds (in cm)?
13. 13.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
14. 14.⬛ A reading below the threshold means the sensor is over … (a) white (b) water (c) the sky (d) black
15. 15.🦾 A servo program runs:
    angle = 100
    angle = angle + 20
    angle = angle + 20
    angle = angle − 50
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
16. 16.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
17. 17.🛞 How far does a wheel roll in one full turn? (a) its diameter (b) its circumference (c) its radius (d) its weight
18. 18.📡 A distance sensor sends a sound pulse and hears the echo 20 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
19. 19.🦾 A servo program runs:
    angle = 80
    angle = angle − 10
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
20. 20.🛞 A robot’s wheels have a diameter of 8 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
21. 21.⚙️ Which gear set-up gives this: “the output turns slower”? (a) big drives small (b) small drives big
22. 22.⚙️ A 10-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
23. 23.🔍 Which sensor helps a robot measure a turn angle? (a) a distance sensor (b) a light sensor (c) a touch sensor (d) a gyro sensor
24. 24.True or false: “the output turns slower” happens when a big gear drives a small one. (a) True (b) False
25. 25.⚙️ A 15-tooth driver gear turns a 60-tooth driven gear. The driver turns 16 times. How many times does the driven gear turn?
26. 26.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 3 turn? (a) anticlockwise (b) clockwise
27. 27.Which of these suits legs? (a) a smooth classroom floor (b) hovering over a roof (c) a field of tall boulders (d) a long factory floor
28. 28.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs backward and the right motor runs forward. What does the robot do? (a) stays still (b) goes straight back (c) spins right on the spot (d) spins left on the spot
29. 29.⚙️ A 40-tooth driver gear turns a 20-tooth driven gear. The driver turns 8 times. How many times does the driven gear turn?
30. 30.🦾 A servo program runs:
    angle = 70
    angle = angle − 20
    angle = angle + 30
    To what angle (in degrees) does the servo turn in the end?
31. 31.⚙️ 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 small driver gear (b) a big driver gear
32. 32.🔦 A light sensor reads 20 over black and 70 over white. A good threshold is halfway between them. What is it?
33. 33.🛞 Which way of moving suits this best: “a muddy building site”? (a) legs (b) wheels (c) propellers (d) tracks
34. 34.⚙️ 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 small driver gear (b) a big driver gear
35. 35.🔢 Gear ratio = driven teeth ÷ … (a) driver teeth (b) wheel size (c) number of gears (d) motor volts
36. 36.🛞 What is the main difficulty with legs for a robot? (a) they never tire (b) they are too cheap (c) too fast on floors (d) harder to balance
37. 37.📡 A robot is 100 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 7 seconds (in cm)?
38. 38.⚙️ Two gears are meshed together. How do they turn? (a) one up, one down (b) in opposite directions (c) they do not turn (d) the same direction
39. 39.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a buzzer (c) a light sensor (d) a DC motor
40. 40.🧭 How many degrees is a full turn? (a) 100° (b) 180° (c) 90° (d) 360°

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