Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 290 · 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 diameter of 7 cm. Using π = 22/7, what is its circumference (in cm)?
2. 2.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
3. 3.Which of these suits wheels? (a) moving under water (b) loose sand dunes (c) crossing stepping-stones (d) a hospital corridor
4. 4.🛞 How far does a wheel roll in one full turn? (a) its circumference (b) its radius (c) its weight (d) its diameter
5. 5.Which of these suits wheels? (a) a field of tall boulders (b) stepping over wide gaps (c) moving under water (d) a smooth classroom floor
6. 6.🔍 For a robot’s controller, is a sensor an input or an output? (a) a gear (b) an output (c) a wheel (d) an input
7. 7.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) number of gears (c) driver teeth (d) motor volts
8. 8.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 7 times (in cm)?
9. 9.📡 A robot is 150 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)?
10. 10.⚙️ A 10-tooth driver gear turns a 30-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?
11. 11.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor is stopped. What does the robot do? (a) stays still (b) goes straight forward (c) goes straight back (d) turns right
12. 12.⬛ The threshold of a light sensor is … (a) the black/white cut-off (b) the top speed (c) the wheel size (d) the battery size
13. 13.🛞 A robot’s wheels have a diameter of 6 cm. Using π = 3.14, how far does the robot roll when the wheels turn 4 times (in cm)? =
14. 14.🦾 A servo program runs:
    angle = 140
    angle = angle − 50
    angle = angle − 50
    angle = angle − 10
    angle = angle + 60
    To what angle (in degrees) does the servo turn in the end?
15. 15.🔍 Which sensor helps a robot know a button is pressed? (a) a gyro sensor (b) a light sensor (c) a sound sensor (d) a touch sensor
16. 16.🔍 Which sensor helps a robot measure how far a box is? (a) a light sensor (b) a sound sensor (c) a touch sensor (d) a distance sensor
17. 17.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 95 and the right sensor reads 65. Which sensor is over the black line? (a) the left sensor (b) the right sensor (c) neither sensor (d) both sensors
18. 18.🛞 A robot’s wheels have a diameter of 21 cm. Using π = 22/7, how many full turns must they make to roll 132 cm?
19. 19.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
20. 20.Which job needs a camera? (a) stop before a wall (b) spot a red ball (c) measure how far a box is (d) feel a bump into a wall
21. 21.🛞 The diameter of a wheel is how many times its radius? (a) 3 (b) 1 (c) 2 (d) 4
22. 22.🛞 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)? =
23. 23.🦾 A servo moves from 90° to 20°. How many degrees does it turn?
24. 24.⚙️ Pulley A turns anticlockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
25. 25.⚙️ Two gears are meshed together. How do they turn? (a) they do not turn (b) the same direction (c) in opposite directions (d) one up, one down
26. 26.⬛ Why does a light sensor read a LOW number over a black line? (a) black soaks up light (b) black is loud (c) black is wet (d) black is hot
27. 27.⚙️ A 12-tooth driver gear must make the driven gear turn 5 times slower. How many teeth must the driven gear have?
28. 28.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how far does the robot roll when the wheels turn 4 times (in cm)?
29. 29.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 45°. Where does the arm point? (a) points up and left (b) points straight up (c) points right (d) points up and right
30. 30.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
31. 31.Which job needs a temperature sensor? (a) warn if motors get hot (b) follow a black line (c) know a button is pressed (d) feel a bump into a wall
32. 32.🧭 What does a gyro help a robot do? (a) see colours (b) smell smoke (c) hear claps (d) turn by exact angles
33. 33.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 48. What is under the sensor? (a) the black line (b) the white floor
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 big driver gear (b) a small driver gear
35. 35.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 55. What is under the sensor? (a) the black line (b) the white floor
36. 36.🧭 A robot keeps turning right by 36° at a time. How many turns make one full circle?
37. 37.True or false: “spins faster with more V” is true of a DC motor. (a) False (b) True
38. 38.🦾 A servo program runs:
    angle = 40
    angle = angle − 40
    angle = angle + 60
    angle = angle − 10
    angle = angle − 30
    To what angle (in degrees) does the servo turn in the end?
39. 39.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 90 and the right sensor reads 70. Which sensor is over the black line? (a) the right sensor (b) both sensors (c) the left sensor (d) neither sensor
40. 40.🔦 A light sensor reads 30 over black and 70 over white. A good threshold is halfway between them. What is it?

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