Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 986 · 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 program runs:
   angle = 0
   angle = angle + 10
   angle = angle + 20
   angle = angle + 10
   To what angle (in degrees) does the servo turn in the end?
2. 2.🔍 For a robot’s controller, is a sensor an input or an output? (a) an output (b) an input (c) a wheel (d) a gear
3. 3.⚙️ A motor makes 180 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?
4. 4.⚙️ An 8-tooth gear drives a 32-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
5. 5.🧭 A robot spins 30° every second. How many seconds does it take to turn 150°?
6. 6.⚙️ A motor makes 480 turns a minute with a 20-tooth gear on it. That gear drives an 80-tooth gear. How many turns a minute does the 80-tooth gear make?
7. 7.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a light sensor (b) a servo motor (c) a buzzer (d) a DC motor
8. 8.🧭 A robot should turn right 180°, but its gyro shows it turned 167°. How many degrees must it turn more to the right?
9. 9.🧭 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 270°. It turns left 120°, then right 120°. What does the gyro read now (0° to 359°)?
10. 10.🔍 Which sensor helps a robot measure how far a box is? (a) a touch sensor (b) a gyro sensor (c) a distance sensor (d) a camera
11. 11.⚙️ A 12-tooth driver gear turns a 36-tooth driven gear. The driven gear turns 10 times. How many times did the driver turn?
12. 12.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how many full turns must they make to roll 264 cm?
13. 13.🦾 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 left (b) points right (c) points up and left (d) points straight up
14. 14.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
15. 15.🛞 Which way of moving suits this best: “a hospital corridor”? (a) tracks (b) propellers (c) wheels (d) legs
16. 16.⚙️ A 15-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
17. 17.🛞 A robot wheel has a radius of 21 cm. Using π = 22/7, what is its circumference (in cm)?
18. 18.🛞 A motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 35 cm (use π = 22/7). The motor turns 8 times. How far does the robot roll (in cm)?
19. 19.True or false: to find the brightest spot, use a distance sensor. (a) False (b) True
20. 20.⚙️ DC motor or servo motor: which one reverses if wires swap? (a) a servo motor (b) a DC motor
21. 21.⚙️ A 12-tooth driver gear turns a 40-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) faster (b) at the same speed (c) slower
22. 22.📡 A distance sensor sends a sound pulse and hears the echo 8 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
23. 23.🧭 A robot should turn right 180°, but its gyro shows it turned 185°. How many degrees must it turn back to the left?
24. 24.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 7 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
25. 25.📡 A robot is 170 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 9 seconds (in cm)?
26. 26.True or false: to start on a hand clap, use a gyro sensor. (a) False (b) True
27. 27.🔍 Which sensor helps a robot warn if motors get hot? (a) a touch sensor (b) a temperature sensor (c) a sound sensor (d) a distance sensor
28. 28.True or false: “moves an arm joint” is true of a DC motor. (a) False (b) True
29. 29.🧭 A robot keeps turning right by 40° at a time. How many turns make one full circle?
30. 30.📡 A robot stops if an object is closer than 60 cm. Its distance sensor hears the echo after 6 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
31. 31.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 8 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
32. 32.⚙️ A 45-tooth driver gear turns a 15-tooth driven gear. The driver turns 9 times. How many times does the driven gear turn?
33. 33.True or false: “the output turns faster” happens when a big gear drives a small one. (a) False (b) True
34. 34.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are shiny (b) they are round (c) they spin in the air (d) they spread the weight
35. 35.🧭 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 right 180°, then right 120°. What does the gyro read now (0° to 359°)?
36. 36.🛞 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?
37. 37.🛞 Which way of moving suits this best: “loose sand dunes”? (a) tracks (b) legs (c) wheels (d) propellers
38. 38.🔦 A light sensor reads 30 over black and 90 over white. A good threshold is halfway between them. What is it?
39. 39.🔦 A light sensor reads 20 over black and 80 over white. A good threshold is halfway between them. What is it?
40. 40.⚙️ A 15-tooth driver gear turns a 30-tooth driven gear. The driver turns 12 times. How many times does the driven gear turn?

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