Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 449 · 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 7 cm. Using π = 22/7, how many full turns must they make to roll 44 cm?
2. 2.📡 An object is 34 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
3. 3.True or false: “the output is stronger” happens when a small gear drives a big one. (a) False (b) True
4. 4.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 30 and the right sensor reads 60. Which sensor is over the black line? (a) both sensors (b) the left sensor (c) neither sensor (d) the right sensor
5. 5.🧭 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 left 90°, then right 120°, then right 45°. What does the gyro read now (0° to 359°)?
6. 6.📡 A distance sensor sends a sound pulse and hears the echo 11 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
7. 7.⚙️ A 10-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
8. 8.⚙️ A 15-tooth driver gear turns a 60-tooth driven gear. The driven gear turns 3 times. How many times did the driver turn?
9. 9.⚙️ A 12-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
10. 10.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 26. What is under the sensor? (a) the white floor (b) the black line
11. 11.Which of these suits legs? (a) a smooth classroom floor (b) flying over a field (c) soft snow (d) a field of tall boulders
12. 12.True or false: “the output is stronger” happens when a big gear drives a small one. (a) False (b) True
13. 13.Which of these suits wheels? (a) a field of tall boulders (b) a flat road (c) crossing stepping-stones (d) loose sand dunes
14. 14.⚙️ A 10-tooth driver gear turns a 50-tooth driven gear. The driver turns 15 times. How many times does the driven gear turn?
15. 15.⚙️ Which gear set-up gives this: “the output is weaker”? (a) big drives small (b) small drives big
16. 16.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 14 cm (use π = 22/7). The motor turns 10 times. How far does the robot roll (in cm)?
17. 17.True or false: to hear a whistle, use a sound sensor. (a) True (b) False
18. 18.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
19. 19.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 5 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
20. 20.🔍 Which sensor helps a robot read a QR code? (a) a gyro sensor (b) a sound sensor (c) a camera (d) a touch sensor
21. 21.🔦 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
22. 22.True or false: “a flat road” suits wheels. (a) True (b) False
23. 23.Which of these suits wheels? (a) hovering over a roof (b) moving under water (c) loose sand dunes (d) a smooth classroom floor
24. 24.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
25. 25.📡 An object is 272 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
26. 26.⚙️ A 15-tooth driver gear turns a 30-tooth driven gear. The driven gear turns 6 times. How many times did the driver turn?
27. 27.🛞 Which way of moving suits this best: “crossing stepping-stones”? (a) wheels (b) legs (c) tracks (d) propellers
28. 28.🦾 A servo program runs:
    angle = 50
    angle = angle − 50
    angle = angle + 40
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
29. 29.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) driver teeth (c) number of gears (d) motor volts
30. 30.🛞 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 backward. What does the robot do? (a) turns right (b) goes straight forward (c) turns left (d) goes straight back
31. 31.True or false: “loose sand dunes” suits wheels. (a) False (b) True
32. 32.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 10 turns a minute and the right wheel at 60 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right
33. 33.📡 An object is 221 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
34. 34.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 14 cm (use π = 22/7). The motor turns 9 times. How far does the robot roll (in cm)?
35. 35.🛞 Which way of moving suits this best: “a hospital corridor”? (a) legs (b) wheels (c) tracks (d) propellers
36. 36.📡 A robot is 260 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 8 seconds (in cm)?
37. 37.🛞 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) spins right on the spot (c) stays still (d) turns left
38. 38.🧭 A robot faces west. It does: turn around, turn right. Which way does it face now? (a) south (b) west (c) east (d) north
39. 39.⚙️ A 50-tooth driver gear turns a 10-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
40. 40.Which job needs a temperature sensor? (a) feel a bump into a wall (b) hear a whistle (c) warn if motors get hot (d) know a button is pressed

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