Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 504 · 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.True or false: “good for lifting loads” happens when a small gear drives a big one. (a) True (b) False
2. 2.True or false: “good for a racing toy” happens when a big gear drives a small one. (a) False (b) True
3. 3.🛞 A robot wheel has a diameter of 35 cm. Using π = 22/7, what is its circumference (in cm)?
4. 4.⚙️ A 36-tooth driver gear turns a 30-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) slower (c) faster
5. 5.⚙️ A 20-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
6. 6.⚙️ Which gear set-up gives this: “the output is stronger”? (a) big drives small (b) small drives big
7. 7.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
8. 8.📡 A robot is 160 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 5 seconds (in cm)?
9. 9.📡 What does an ultrasonic distance sensor send out? (a) water drops (b) radio music (c) bright light (d) sound too high to hear
10. 10.🧭 A robot keeps turning right by 60° at a time. How many turns make one full circle?
11. 11.📡 A robot is 140 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 5 seconds (in cm)?
12. 12.🧭 A robot spins 15° every second. How many seconds does it take to turn 135°?
13. 13.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times slower (b) 3 times bigger (c) 3 times louder (d) 3 times faster
14. 14.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 9 times (in cm)?
15. 15.⚙️ DC motor or servo motor: which one turns to an exact angle? (a) a servo motor (b) a DC motor
16. 16.True or false: “good for a slow crane” happens when a small gear drives a big one. (a) True (b) False
17. 17.🧭 A robot should turn right 45°, but its gyro shows it turned 47°. How many degrees must it turn back to the left?
18. 18.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
19. 19.🛞 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) goes straight back (b) goes straight forward (c) turns right (d) spins right on the spot
20. 20.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 60 turns a minute and the right wheel at 60 turns a minute. What does the robot do? (a) curves to the right (b) curves to the left (c) goes straight forward
21. 21.🧭 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 180°. It turns left 135°, then left 30°, then left 45°. What does the gyro read now (0° to 359°)?
22. 22.📡 An object is 204 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
23. 23.⚙️ Two gears are meshed together. How do they turn? (a) in opposite directions (b) they do not turn (c) one up, one down (d) the same direction
24. 24.⚙️ DC motor or servo motor: which one has just two wires? (a) a servo motor (b) a DC motor
25. 25.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 45. What is under the sensor? (a) the black line (b) the white floor
26. 26.⚙️ DC motor or servo motor: which one spins round and round? (a) a DC motor (b) a servo motor
27. 27.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 180°. Where does the arm point? (a) points straight up (b) points right (c) points left (d) points up and left
28. 28.True or false: to stop before a wall, use a gyro sensor. (a) True (b) False
29. 29.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
30. 30.⬛ Why does a light sensor read a LOW number over a black line? (a) black is loud (b) black is hot (c) black soaks up light (d) black is wet
31. 31.⚙️ A motor makes 120 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?
32. 32.⚙️ A robot arm must lift a heavy load slowly. The motor’s driver gear meshes with a big gear. What kind of driver gear works best? (a) a small driver gear (b) a big driver gear
33. 33.🛞 How far does a wheel roll in one full turn? (a) its radius (b) its weight (c) its diameter (d) its circumference
34. 34.🛞 What is the main difficulty with legs for a robot? (a) harder to balance (b) too fast on floors (c) they are too cheap (d) they never tire
35. 35.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how far does the robot roll when the wheels turn 4 times (in cm)?
36. 36.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
37. 37.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 34. What is under the sensor? (a) the black line (b) the white floor
38. 38.🧭 A robot faces north. It does: turn right, turn left, turn around, turn left. Which way does it face now? (a) west (b) south (c) east (d) north
39. 39.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) swap its two wires (c) add more wheels (d) paint it red
40. 40.🛞 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 forward. What does the robot do? (a) stays still (b) spins left on the spot (c) goes straight back (d) turns right

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