Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 521 · 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.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) backwards (b) nowhere (c) slower (d) faster
2. 2.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how many full turns must they make to roll 396 cm?
3. 3.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how far does the robot roll when the wheels turn 6 times (in cm)?
4. 4.📡 In these lessons, sound travels about how far in 1 millisecond? (a) 34 cm (b) 340 cm (c) 3 cm (d) 1 km
5. 5.True or false: to know a button is pressed, use a touch sensor. (a) True (b) False
6. 6.🧭 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 90°. It turns left 60°, then left 180°. What does the gyro read now (0° to 359°)?
7. 7.🔦 A light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?
8. 8.Which of these suits tracks? (a) deep mud (b) a field of tall boulders (c) a long factory floor (d) flying over a field
9. 9.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a servo motor (b) a DC motor
10. 10.🦾 A servo moves from 60° to 90°. How many degrees does it turn?
11. 11.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
12. 12.True or false: “a flat road” suits wheels. (a) True (b) False
13. 13.⚙️ The gear fixed to the motor is called the … (a) driven gear (b) tyre (c) idler gear (d) driver gear
14. 14.📡 What does an ultrasonic distance sensor send out? (a) water drops (b) sound too high to hear (c) radio music (d) bright light
15. 15.⚙️ 3 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 3 turn? (a) anticlockwise (b) clockwise
16. 16.Which of these suits legs? (a) crossing stepping-stones (b) a muddy building site (c) a flat road (d) deep mud
17. 17.⚙️ Which gear set-up gives this: “the output is stronger”? (a) small drives big (b) big drives small
18. 18.🧭 A robot should turn right 90°, but its gyro shows it turned 81°. How many degrees must it turn more to the right?
19. 19.True or false: “a field of tall boulders” suits legs. (a) True (b) False
20. 20.🧭 A robot should turn right 180°, but its gyro shows it turned 176°. How many degrees must it turn more to the right?
21. 21.⚙️ 6 gears are in a row, each meshed with the next. Gear 1 turns clockwise. Which way does gear 6 turn? (a) clockwise (b) anticlockwise
22. 22.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 28. What is under the sensor? (a) the black line (b) the white floor
23. 23.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 25. What is under the sensor? (a) the white floor (b) the black line
24. 24.🔍 Which sensor helps a robot measure a turn angle? (a) a temperature sensor (b) a gyro sensor (c) a camera (d) a touch sensor
25. 25.⚙️ A motor makes 300 turns a minute with a 20-tooth gear on it. That gear drives a 60-tooth gear. How many turns a minute does the 60-tooth gear make?
26. 26.🛞 Which way of moving suits this best: “stepping over wide gaps”? (a) tracks (b) propellers (c) legs (d) wheels
27. 27.⚙️ A 24-tooth driver gear turns a 40-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) faster (c) slower
28. 28.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 50 turns a minute and the right wheel at 60 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the left (c) curves to the right
29. 29.⚙️ 4 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 4 turn? (a) anticlockwise (b) clockwise
30. 30.⚙️ A common servo can turn from 0° up to about … (a) 180° (b) 18° (c) 1800° (d) 10°
31. 31.True or false: “good for a fast fan” happens when a big gear drives a small one. (a) False (b) True
32. 32.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) number of gears (c) motor volts (d) driver teeth
33. 33.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
34. 34.🧭 A robot should turn right 45°, but its gyro shows it turned 43°. How many degrees must it turn more to the right?
35. 35.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 35 and the right sensor reads 10. Which sensor is over the black line? (a) the right sensor (b) neither sensor (c) the left sensor (d) both sensors
36. 36.🔢 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)
37. 37.🛞 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 2 times. How far does the robot roll (in cm)?
38. 38.🧭 A robot keeps turning right by 36° at a time. How many turns make one full circle?
39. 39.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
40. 40.True or false: “good for a fast fan” happens when a small gear drives a big one. (a) True (b) False

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