Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 584 · 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 a racing toy” happens when a big gear drives a small one. (a) True (b) False
2. 2.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 10 and the right sensor reads 30. Which sensor is over the black line? (a) the right sensor (b) neither sensor (c) both sensors (d) the left sensor
3. 3.🔦 A light sensor reads below 60 over a black line and above 60 over the white floor. It reads 54. What is under the sensor? (a) the white floor (b) the black line
4. 4.⚙️ How do you make a DC motor spin the other way? (a) paint it red (b) swap its two wires (c) add more wheels (d) shake it
5. 5.🛞 A robot’s wheels have a diameter of 20 cm. Using π = 3.14, how far does the robot roll when the wheels turn 1 time (in cm)? =
6. 6.⚙️ Which gear set-up gives this: “good for lifting loads”? (a) big drives small (b) small drives big
7. 7.True or false: “stepping over wide gaps” suits legs. (a) True (b) False
8. 8.🛞 How does a two-wheeled robot with no steering turn? (a) it uses a sail (b) one wheel runs faster (c) it stops for ever (d) it jumps
9. 9.🛞 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)?
10. 10.⚙️ A 20-tooth driver gear turns a 60-tooth driven gear. The driven gear turns 2 times. How many times did the driver turn?
11. 11.📡 A robot is 280 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 27 seconds (in cm)?
12. 12.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 45°. Where does the arm point? (a) points right (b) points up and right (c) points straight up (d) points up and left
13. 13.🧭 How many degrees is a right-angle turn? (a) 360° (b) 45° (c) 90° (d) 180°
14. 14.Which of these suits tracks? (a) a smooth classroom floor (b) soft snow (c) stepping over wide gaps (d) a long factory floor
15. 15.🦾 A servo moves from 40° to 50°. How many degrees does it turn?
16. 16.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how many full turns must they make to roll 88 cm?
17. 17.⚙️ DC motor or servo motor: which one moves an arm joint? (a) a servo motor (b) a DC motor
18. 18.🔍 For a robot’s controller, is a sensor an input or an output? (a) an output (b) a gear (c) an input (d) a wheel
19. 19.⚙️ Two gears are meshed together. How do they turn? (a) in opposite directions (b) the same direction (c) they do not turn (d) one up, one down
20. 20.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
21. 21.📡 A robot is 230 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 3 seconds (in cm)?
22. 22.True or false: “has just two wires” is true of a servo motor. (a) True (b) False
23. 23.Which of these suits wheels? (a) crossing stepping-stones (b) stepping over wide gaps (c) a flat road (d) soft snow
24. 24.🛞 A robot wheel has a diameter of 7 cm. Using π = 22/7, what is its circumference (in cm)?
25. 25.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 2/7 (b) 7/22 (c) 22/7 (d) 22
26. 26.Which of these suits propellers? (a) crossing stepping-stones (b) a field of tall boulders (c) a flat road (d) moving under water
27. 27.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) small (fast, weak) (b) never important (c) big (slow and strong) (d) zero
28. 28.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
29. 29.⚙️ DC motor or servo motor: which one has a signal wire? (a) a servo motor (b) a DC motor
30. 30.🔦 A light sensor reads 40 over black and 80 over white. A good threshold is halfway between them. What is it?
31. 31.🔦 A light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?
32. 32.⚙️ Which motor is best for spinning a robot’s wheels round and round? (a) a servo motor (b) a light sensor (c) a DC motor (d) a buzzer
33. 33.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 95 and the right sensor reads 90. Which sensor is over the black line? (a) neither sensor (b) the right sensor (c) both sensors (d) the left sensor
34. 34.📡 A robot stops if an object is closer than 50 cm. Its distance sensor hears the echo after 5 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
35. 35.Which of these suits wheels? (a) a long factory floor (b) crossing stepping-stones (c) deep mud (d) a muddy building site
36. 36.📡 A distance sensor sends a sound pulse and hears the echo 2 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
37. 37.📡 A robot is 180 cm from a wall and drives straight at it at 10 cm per second. How far from the wall is it after 6 seconds (in cm)?
38. 38.🦾 A servo moves from 130° to 180°. How many degrees does it turn?
39. 39.⚙️ A 24-tooth driver gear turns an 8-tooth driven gear. The driver turns 6 times. How many times does the driven gear turn?
40. 40.🔍 Which sensor helps a robot measure how far a box is? (a) a camera (b) a distance sensor (c) a touch sensor (d) a sound sensor

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