Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 313 · 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 robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
2. 2.⚙️ Which gear set-up gives this: “good for a slow crane”? (a) big drives small (b) small drives big
3. 3.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) zero (b) small (fast, weak) (c) never important (d) big (slow and strong)
4. 4.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 90°?
5. 5.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
6. 6.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times bigger (b) 3 times slower (c) 3 times faster (d) 3 times louder
7. 7.🔍 Which sensor helps a robot spot a red ball? (a) a light sensor (b) a temperature sensor (c) a distance sensor (d) a camera
8. 8.True or false: “moves an arm joint” is true of a DC motor. (a) True (b) False
9. 9.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 5 times (in cm)?
10. 10.⚙️ A 60-tooth driver gear turns a 12-tooth driven gear. The driver turns 3 times. How many times does the driven gear turn?
11. 11.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how far does the robot roll when the wheels turn 7 times (in cm)?
12. 12.⚙️ A motor makes 80 turns a minute with a 15-tooth gear on it. That gear drives a 30-tooth gear. How many turns a minute does the 30-tooth gear make?
13. 13.🦾 A servo program runs:
    angle = 90
    angle = angle − 30
    angle = angle + 10
    angle = angle + 60
    angle = angle − 40
    To what angle (in degrees) does the servo turn in the end?
14. 14.🛞 Which way of moving suits this best: “crossing stepping-stones”? (a) wheels (b) legs (c) tracks (d) propellers
15. 15.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
16. 16.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
17. 17.📡 An object is 51 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
18. 18.🧭 A robot should turn right 180°, but its gyro shows it turned 166°. How many degrees must it turn more to the right?
19. 19.🛞 Which way of moving suits this best: “flying over a field”? (a) propellers (b) wheels (c) tracks (d) legs
20. 20.🧭 A robot faces south. It does: turn right, turn left, turn left. Which way does it face now? (a) north (b) south (c) west (d) east
21. 21.🧭 A robot faces south. It does: turn left, turn right, turn right. Which way does it face now? (a) north (b) south (c) west (d) east
22. 22.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
23. 23.📡 A robot is 290 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 2 seconds (in cm)?
24. 24.True or false: “spins round and round” is true of a DC motor. (a) False (b) True
25. 25.🛞 The diameter of a wheel is how many times its radius? (a) 2 (b) 1 (c) 3 (d) 4
26. 26.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 2 turn? (a) clockwise (b) anticlockwise
27. 27.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
28. 28.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) small drives big (b) big drives small
29. 29.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 21 cm (use π = 22/7). The motor turns 15 times. How far does the robot roll (in cm)?
30. 30.🧭 A robot faces south. It does: turn left, turn around. Which way does it face now? (a) west (b) south (c) north (d) east
31. 31.⚙️ A 40-tooth driver gear turns an 8-tooth driven gear. The driver turns 1 time. How many times does the driven gear turn?
32. 32.🧭 A robot keeps turning right by 90° at a time. How many turns make one full circle?
33. 33.🔍 Which sensor helps a robot start on a hand clap? (a) a sound sensor (b) a camera (c) a touch sensor (d) a distance sensor
34. 34.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a buzzer (b) a servo motor (c) a light sensor (d) a DC motor
35. 35.⚙️ A 50-tooth driver gear turns a 10-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
36. 36.⬛ The threshold of a light sensor is … (a) the top speed (b) the wheel size (c) the battery size (d) the black/white cut-off
37. 37.⚙️ A 60-tooth driver gear turns a 12-tooth driven gear. The driver turns 10 times. How many times does the driven gear turn?
38. 38.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 10 turns a minute and the right wheel at 30 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
39. 39.📡 Which animal finds its way by echoes, like this sensor? (a) a bat (b) a cow (c) a goldfish (d) a snail
40. 40.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 33. What is under the sensor? (a) the white floor (b) the black line

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