Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 189 · 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 big gear drives a small gear. The small gear turns … (a) not at all (b) at the same speed (c) faster but weaker (d) slower but stronger
2. 2.Which of these suits wheels? (a) loose sand dunes (b) a flat road (c) stepping over wide gaps (d) deep mud
3. 3.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 10 turns a minute and the right wheel at 100 turns a minute. What does the robot do? (a) goes straight forward (b) curves to the left (c) curves to the right
4. 4.⚙️ A 12-tooth driver gear turns a 24-tooth driven gear. The driver turns 12 times. How many times does the driven gear turn?
5. 5.🔦 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) neither sensor (b) the right sensor (c) the left sensor (d) both sensors
6. 6.🧭 A robot should turn right 90°, but its gyro shows it turned 84°. How many degrees must it turn more to the right?
7. 7.True or false: “the output turns faster” happens when a big gear drives a small one. (a) False (b) True
8. 8.📡 An object is 323 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
9. 9.🦾 A servo program runs:
   angle = 120
   angle = angle − 50
   angle = angle + 20
   To what angle (in degrees) does the servo turn in the end?
10. 10.⚙️ DC motor or servo motor: which one usually turns 0° to 180°? (a) a DC motor (b) a servo motor
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 runs forward. What does the robot do? (a) goes straight forward (b) goes straight back (c) spins right on the spot (d) turns left
12. 12.⚙️ Which gear set-up gives this: “the output turns faster”? (a) small drives big (b) big drives small
13. 13.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 30 turns a minute and the right wheel at 40 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
14. 14.🛞 Why do most indoor robots use wheels? (a) they look funny (b) they climb stairs (c) they float (d) fast and easy on floors
15. 15.🛞 What is the main difficulty with legs for a robot? (a) they are too cheap (b) too fast on floors (c) they never tire (d) harder to balance
16. 16.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
17. 17.🔍 A light sensor gets the most reflected light from … (a) a dark tunnel (b) a white surface (c) a black line (d) a black surface
18. 18.📡 A distance sensor sends a sound pulse and hears the echo 17 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
19. 19.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 90°. Where does the arm point? (a) points left (b) points straight up (c) points up and right (d) points right
20. 20.True or false: “good for a fast fan” happens when a small gear drives a big one. (a) True (b) False
21. 21.📡 Which animal finds its way by echoes, like this sensor? (a) a snail (b) a bat (c) a goldfish (d) a cow
22. 22.True or false: “spins round and round” is true of a DC motor. (a) True (b) False
23. 23.🧭 A robot faces west. It does: turn left, turn right, turn left, turn right. Which way does it face now? (a) north (b) west (c) south (d) east
24. 24.⚙️ Which gear set-up gives this: “good for a racing toy”? (a) small drives big (b) big drives small
25. 25.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 21 cm (use π = 22/7). The motor turns 6 times. How far does the robot roll (in cm)?
26. 26.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times faster (b) 3 times louder (c) 3 times bigger (d) 3 times slower
27. 27.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) never important (b) big (slow and strong) (c) small (fast, weak) (d) zero
28. 28.🧭 A robot faces south. It does: turn around, turn around. Which way does it face now? (a) east (b) north (c) west (d) south
29. 29.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 57. What is under the sensor? (a) the white floor (b) the black line
30. 30.⚙️ A 10-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
31. 31.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how far does the robot roll when the wheels turn 3 times (in cm)?
32. 32.🔦 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 left sensor (b) the right sensor (c) both sensors (d) neither sensor
33. 33.⚙️ A motor makes 240 turns a minute with a 10-tooth gear on it. That gear drives a 20-tooth gear. How many turns a minute does the 20-tooth gear make?
34. 34.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 2 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
35. 35.⚙️ A small gear drives a big gear. The big gear turns … (a) not at all (b) faster and weaker (c) at the same speed (d) slower but stronger
36. 36.🔢 Gear ratio = driven teeth ÷ … (a) motor volts (b) number of gears (c) wheel size (d) driver teeth
37. 37.⚙️ 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 small driver gear (b) a big driver gear
38. 38.True or false: “good for lifting loads” happens when a big gear drives a small one. (a) False (b) True
39. 39.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
40. 40.🛞 A robot’s wheels have a diameter of 20 cm. Using π = 3.14, how far does the robot roll when the wheels turn 2 times (in cm)? =

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