Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 436 · 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.⚙️ Which gear set-up gives this: “the output turns slower”? (a) small drives big (b) big drives small
2. 2.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how many full turns must they make to roll 308 cm?
3. 3.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) far behind it (b) under the left sensor (c) under the right sensor (d) between the two sensors
4. 4.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 28 cm (use π = 22/7). The motor turns 10 times. How far does the robot roll (in cm)?
5. 5.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 100 turns a minute and the right wheel at 100 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
6. 6.🛞 How far does a wheel roll in one full turn? (a) its radius (b) its weight (c) its diameter (d) its circumference
7. 7.📡 An object is 289 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
8. 8.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
9. 9.True or false: “loose sand dunes” suits tracks. (a) False (b) True
10. 10.🧭 A robot spins 15° every second. How many seconds does it take to turn 105°?
11. 11.⚙️ A motor makes 220 turns a minute with a 12-tooth gear on it. That gear drives a 24-tooth gear. How many turns a minute does the 24-tooth gear make?
12. 12.🧭 How many degrees is a full turn? (a) 180° (b) 90° (c) 100° (d) 360°
13. 13.True or false: “good for a racing toy” happens when a big gear drives a small one. (a) True (b) False
14. 14.True or false: “the output turns slower” happens when a big gear drives a small one. (a) True (b) False
15. 15.🦾 A servo program runs:
    angle = 50
    angle = angle + 40
    angle = angle − 50
    To what angle (in degrees) does the servo turn in the end?
16. 16.True or false: “the output is weaker” happens when a big gear drives a small one. (a) False (b) True
17. 17.🛞 Which way of moving suits this best: “flying over a field”? (a) legs (b) tracks (c) propellers (d) wheels
18. 18.True or false: “good for a slow crane” happens when a big gear drives a small one. (a) True (b) False
19. 19.Which of these suits propellers? (a) moving under water (b) a smooth classroom floor (c) a flat road (d) stepping over wide gaps
20. 20.🛞 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) stays still (d) goes straight forward
21. 21.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 120°?
22. 22.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) shake it (c) add more wheels (d) paint it red
23. 23.🧭 A robot keeps turning right by 90° at a time. How many turns make one full circle?
24. 24.⚙️ 4 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 4 turn? (a) clockwise (b) anticlockwise
25. 25.True or false: “a hospital corridor” suits tracks. (a) False (b) True
26. 26.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
27. 27.📡 A robot is 120 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 2 seconds (in cm)?
28. 28.⚙️ A small gear drives a big gear. The big gear turns … (a) faster and weaker (b) not at all (c) slower but stronger (d) at the same speed
29. 29.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 67. What is under the sensor? (a) the black line (b) the white floor
30. 30.🛞 The diameter of a wheel is how many times its radius? (a) 3 (b) 1 (c) 4 (d) 2
31. 31.🛞 How does a two-wheeled robot with no steering turn? (a) one wheel runs faster (b) it uses a sail (c) it stops for ever (d) it jumps
32. 32.⚙️ A 45-tooth driver gear turns a 15-tooth driven gear. The driver turns 5 times. How many times does the driven gear turn?
33. 33.🦾 A servo moves from 130° to 30°. How many degrees does it turn?
34. 34.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 65 and the right sensor reads 25. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) the left sensor (d) both sensors
35. 35.🦾 A servo program runs:
    angle = 50
    angle = angle + 60
    angle = angle + 30
    angle = angle + 20
    angle = angle − 20
    To what angle (in degrees) does the servo turn in the end?
36. 36.📡 A distance sensor sends a sound pulse and hears the echo 13 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
37. 37.Which job needs a light sensor? (a) stay balanced upright (b) find the brightest spot (c) feel a bump into a wall (d) stop before a wall
38. 38.⚙️ An 8-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
39. 39.⚙️ A motor makes 80 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?
40. 40.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how many full turns must they make to roll 704 cm?

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