Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 295 · 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’s wheels have a diameter of 5 cm. Using π = 3.14, how far does the robot roll when the wheels turn 1 time (in cm)? =
2. 2.Which job needs a camera? (a) spot a red ball (b) measure a turn angle (c) measure how far a box is (d) know a button is pressed
3. 3.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
4. 4.🧭 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 270°. It turns right 135°, then left 180°, then right 30°. What does the gyro read now (0° to 359°)?
5. 5.True or false: to read a QR code, use a camera. (a) False (b) True
6. 6.🦾 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 left (b) points right (c) points up and right (d) points straight up
7. 7.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) slower (b) faster (c) backwards (d) nowhere
8. 8.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 7 cm (use π = 22/7). The motor turns 6 times. How far does the robot roll (in cm)?
9. 9.True or false: “the output is weaker” happens when a small gear drives a big one. (a) False (b) True
10. 10.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) small (fast, weak) (b) zero (c) never important (d) big (slow and strong)
11. 11.🦾 A servo moves from 120° to 0°. How many degrees does it turn?
12. 12.True or false: to start on a hand clap, use a sound sensor. (a) False (b) True
13. 13.⚙️ A 10-tooth driver gear turns a 30-tooth driven gear. The driven gear turns 3 times. How many times did the driver turn?
14. 14.True or false: to read a QR code, use a sound sensor. (a) False (b) True
15. 15.🛞 Which way of moving suits this best: “a flat road”? (a) tracks (b) legs (c) propellers (d) wheels
16. 16.True or false: to know a button is pressed, use a gyro sensor. (a) True (b) False
17. 17.⚙️ A 36-tooth driver gear turns an 8-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) faster (c) at the same speed
18. 18.📡 Which animal finds its way by echoes, like this sensor? (a) a snail (b) a goldfish (c) a cow (d) a bat
19. 19.🛞 A robot’s wheels have a diameter of 5 cm. Using π = 3.14, how far does the robot roll when the wheels turn 4 times (in cm)? =
20. 20.⚙️ A 30-tooth driver gear turns a 24-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) faster (c) at the same speed
21. 21.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 80 and the right sensor reads 25. Which sensor is over the black line? (a) the right sensor (b) neither sensor (c) both sensors (d) the left sensor
22. 22.🛞 The diameter of a wheel is how many times its radius? (a) 4 (b) 2 (c) 1 (d) 3
23. 23.⚙️ The gear fixed to the motor is called the … (a) idler gear (b) driver gear (c) tyre (d) driven gear
24. 24.⚙️ A 12-tooth driver gear turns a 48-tooth driven gear. The driver turns 32 times. How many times does the driven gear turn?
25. 25.True or false: to stay balanced upright, use a camera. (a) False (b) True
26. 26.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
27. 27.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 5 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
28. 28.📡 A robot is 160 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 7 seconds (in cm)?
29. 29.Which job needs a temperature sensor? (a) warn if motors get hot (b) start on a hand clap (c) feel a bump into a wall (d) stay balanced upright
30. 30.🔍 Which sensor helps a robot find the brightest spot? (a) a touch sensor (b) a gyro sensor (c) a sound sensor (d) a light sensor
31. 31.🧭 A robot keeps turning right by 36° at a time. How many turns make one full circle?
32. 32.🛞 Which way of moving suits this best: “a smooth classroom floor”? (a) propellers (b) tracks (c) wheels (d) legs
33. 33.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how many full turns must they make to roll 1320 cm?
34. 34.⚙️ 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
35. 35.⚙️ A 10-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 10 times. How many times did the driver turn?
36. 36.🦾 A servo program runs:
    angle = 120
    angle = angle − 10
    angle = angle − 40
    angle = angle + 10
    angle = angle + 20
    To what angle (in degrees) does the servo turn in the end?
37. 37.📡 A distance sensor sends a sound pulse and hears the echo 8 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
38. 38.📡 A distance sensor sends a sound pulse and hears the echo 2 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
39. 39.⚙️ An 8-tooth driver gear turns a 40-tooth driven gear. The driven gear turns 9 times. How many times did the driver turn?
40. 40.⚙️ Which gear set-up gives this: “the output is stronger”? (a) small drives big (b) big drives small

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