Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 94 · 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 motor’s 10-tooth gear drives a 20-tooth gear on the wheel axle. The wheels have a diameter of 42 cm (use π = 22/7). The motor turns 4 times. How far does the robot roll (in cm)?
2. 2.🛞 Circumference = π × … (a) weight (b) diameter (c) speed (d) radius only
3. 3.Which of these suits wheels? (a) soft snow (b) a long factory floor (c) a field of tall boulders (d) moving under water
4. 4.True or false: “deep mud” suits legs. (a) False (b) True
5. 5.🔍 A light sensor gets the most reflected light from … (a) a black surface (b) a dark tunnel (c) a black line (d) a white surface
6. 6.📡 Which animal finds its way by echoes, like this sensor? (a) a bat (b) a cow (c) a goldfish (d) a snail
7. 7.⚙️ A 12-tooth driver gear must make the driven gear turn 3 times slower. How many teeth must the driven gear have?
8. 8.🛞 A robot’s wheels have a diameter of 7 cm. Using π = 22/7, how far does the robot roll when the wheels turn 4 times (in cm)?
9. 9.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 7/22 (b) 22 (c) 22/7 (d) 2/7
10. 10.Which of these suits propellers? (a) flying over a field (b) a smooth classroom floor (c) stepping over wide gaps (d) a flat road
11. 11.⚙️ A 60-tooth driver gear turns a 20-tooth driven gear. The driver turns 8 times. How many times does the driven gear turn?
12. 12.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 2 turn? (a) anticlockwise (b) clockwise
13. 13.True or false: to stop before a wall, use a light sensor. (a) False (b) True
14. 14.True or false: “a hospital corridor” suits tracks. (a) True (b) False
15. 15.🛞 Which way of moving suits this best: “a flat road”? (a) wheels (b) propellers (c) tracks (d) legs
16. 16.🛞 Which way of moving suits this best: “a long factory floor”? (a) tracks (b) legs (c) wheels (d) propellers
17. 17.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 150°?
18. 18.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?
19. 19.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
20. 20.🔦 A light sensor reads 20 over black and 80 over white. A good threshold is halfway between them. What is it?
21. 21.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
22. 22.Which of these suits legs? (a) a long factory floor (b) soft snow (c) flying over a field (d) stepping over wide gaps
23. 23.True or false: “good for a racing toy” happens when a small gear drives a big one. (a) False (b) True
24. 24.⚙️ A 20-tooth driver gear turns an 80-tooth driven gear. The driver turns 40 times. How many times does the driven gear turn?
25. 25.🔦 A light sensor reads below 30 over a black line and above 30 over the white floor. It reads 38. What is under the sensor? (a) the black line (b) the white floor
26. 26.🧭 A robot keeps turning right by 60° at a time. How many turns make one full circle?
27. 27.🛞 How far does a wheel roll in one full turn? (a) its radius (b) its circumference (c) its weight (d) its diameter
28. 28.⚙️ Pulley A turns anticlockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) anticlockwise (b) clockwise
29. 29.📡 A distance sensor sends a sound pulse and hears the echo 10 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
30. 30.🧭 A robot spins 45° every second. How many seconds does it take to turn 90°?
31. 31.🦾 A servo program runs:
    angle = 80
    angle = angle + 40
    angle = angle − 30
    angle = angle − 60
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
32. 32.⚙️ Two gears are meshed together. How do they turn? (a) they do not turn (b) the same direction (c) in opposite directions (d) one up, one down
33. 33.🛞 A robot wheel has a diameter of 35 cm. Using π = 22/7, what is its circumference (in cm)?
34. 34.🔢 Gear ratio = driven teeth ÷ … (a) wheel size (b) motor volts (c) number of gears (d) driver teeth
35. 35.Which of these suits wheels? (a) a muddy building site (b) flying over a field (c) deep mud (d) a smooth classroom floor
36. 36.⚙️ Which motor is best for turning a robot arm to exactly 45°? (a) a DC motor (b) a buzzer (c) a servo motor (d) a fan
37. 37.True or false: “spins faster with more V” is true of a DC motor. (a) True (b) False
38. 38.📡 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)?
39. 39.🛞 A robot’s wheels have a diameter of 6 cm. Using π = 3.14, how far does the robot roll when the wheels turn 3 times (in cm)? =
40. 40.🛞 A robot wheel has a radius of 14 cm. Using π = 22/7, what is its circumference (in cm)?

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