Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 33 · 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 servo moves from 100° to 80°. How many degrees does it turn?
2. 2.⚙️ A 24-tooth driver gear turns a 12-tooth driven gear. The driver turns 4 times. How many times does the driven gear turn?
3. 3.⚙️ A 10-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
4. 4.🔦 A light sensor reads 40 over black and 70 over white. A good threshold is halfway between them. What is it?
5. 5.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 3 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
6. 6.🛞 A robot’s wheels have a diameter of 8 cm. Using π = 3.14, how far does the robot roll when the wheels turn 1 time (in cm)? =
7. 7.🔦 A light sensor reads 10 over black and 90 over white. A good threshold is halfway between them. What is it?
8. 8.⚙️ Two gears are meshed together. How do they turn? (a) the same direction (b) they do not turn (c) one up, one down (d) in opposite directions
9. 9.⚙️ An 8-tooth driver gear turns a 16-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
10. 10.🛞 A robot wheel has a diameter of 28 cm. Using π = 22/7, what is its circumference (in cm)?
11. 11.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor runs backward. What does the robot do? (a) spins left on the spot (b) stays still (c) spins right on the spot (d) goes straight forward
12. 12.True or false: “flying over a field” suits propellers. (a) False (b) True
13. 13.🧭 A robot should turn right 45°, but its gyro shows it turned 37°. How many degrees must it turn more to the right?
14. 14.📡 A robot is 170 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 16 seconds (in cm)?
15. 15.⚙️ A motor makes 180 turns a minute with a 15-tooth gear on it. That gear drives a 30-tooth gear. How many turns a minute does the 30-tooth gear make?
16. 16.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
17. 17.🛞 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?
18. 18.True or false: “reverses if wires swap” is true of a servo motor. (a) True (b) False
19. 19.⚙️ A 32-tooth driver gear turns an 8-tooth driven gear. The driver turns 2 times. How many times does the driven gear turn?
20. 20.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 35 and the right sensor reads 40. Which sensor is over the black line? (a) both sensors (b) neither sensor (c) the right sensor (d) the left sensor
21. 21.🛞 A robot’s wheels have a diameter of 10 cm. Using π = 3.14, how far does the robot roll when the wheels turn 4 times (in cm)? =
22. 22.⬛ Why does a light sensor read a LOW number over a black line? (a) black is loud (b) black is hot (c) black is wet (d) black soaks up light
23. 23.🔍 Which sensor helps a robot find the brightest spot? (a) a distance sensor (b) a light sensor (c) a camera (d) a temperature sensor
24. 24.🛞 A robot’s wheels have a diameter of 6 cm. Using π = 3.14, how far does the robot roll when the wheels turn 1 time (in cm)? =
25. 25.True or false: “the output turns slower” happens when a small gear drives a big one. (a) False (b) True
26. 26.⚙️ A motor makes 250 turns a minute with an 8-tooth gear on it. That gear drives a 40-tooth gear. How many turns a minute does the 40-tooth gear make?
27. 27.🔍 Which sensor helps a robot warn if motors get hot? (a) a gyro sensor (b) a light sensor (c) a temperature sensor (d) a distance sensor
28. 28.🛞 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) goes straight forward (b) turns left (c) goes straight back (d) turns right
29. 29.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 15 and the right sensor reads 65. Which sensor is over the black line? (a) the right sensor (b) both sensors (c) neither sensor (d) the left sensor
30. 30.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?
31. 31.Which of these suits legs? (a) moving under water (b) soft snow (c) stepping over wide gaps (d) hovering over a roof
32. 32.🔍 Which sensor helps a robot follow a black line? (a) a light sensor (b) a camera (c) a distance sensor (d) a sound sensor
33. 33.⬛ The threshold of a light sensor is … (a) the battery size (b) the black/white cut-off (c) the wheel size (d) the top speed
34. 34.🔍 For a robot’s controller, is a sensor an input or an output? (a) a gear (b) a wheel (c) an input (d) an output
35. 35.🧭 A robot faces north. It does: turn right, turn around. Which way does it face now? (a) north (b) south (c) east (d) west
36. 36.⚙️ A motor makes 200 turns a minute with a 20-tooth gear on it. That gear drives a 40-tooth gear. How many turns a minute does the 40-tooth gear make?
37. 37.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times slower (b) 3 times louder (c) 3 times faster (d) 3 times bigger
38. 38.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
39. 39.True or false: “good for a fast fan” happens when a big gear drives a small one. (a) True (b) False
40. 40.🛞 A robot’s wheels have a diameter of 28 cm. Using π = 22/7, how many full turns must they make to roll 528 cm?

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