Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 96 · 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 robot’s wheels have a diameter of 14 cm. Using π = 22/7, how many full turns must they make to roll 132 cm?
2. 2.🧭 How many degrees is a full turn? (a) 90° (b) 360° (c) 100° (d) 180°
3. 3.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
4. 4.⚙️ 2 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 2 turn? (a) clockwise (b) anticlockwise
5. 5.⚙️ 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 big driver gear (b) a small driver gear
6. 6.🦾 A servo moves from 90° to 140°. How many degrees does it turn?
7. 7.⚙️ Which gear set-up gives this: “the output is weaker”? (a) small drives big (b) big drives small
8. 8.🦾 A servo program runs:
   angle = 10
   angle = angle + 30
   angle = angle + 30
   angle = angle − 10
   angle = angle − 20
   To what angle (in degrees) does the servo turn in the end?
9. 9.True or false: “reverses if wires swap” is true of a DC motor. (a) True (b) False
10. 10.🧭 A robot spins 45° every second. How many seconds does it take to turn 360°?
11. 11.🧭 A robot keeps turning right by 36° at a time. How many turns make one full circle?
12. 12.🦾 A servo moves from 50° to 140°. How many degrees does it turn?
13. 13.🦾 A servo moves from 20° to 80°. How many degrees does it turn?
14. 14.📡 A distance sensor sends a sound pulse and hears the echo 4 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
15. 15.📡 Why do we halve the echo’s total path? (a) to make it smaller (b) it goes there and back (c) sound is slow (d) the sensor is half
16. 16.⚙️ A 36-tooth driver gear turns a 12-tooth driven gear. The driver turns 7 times. How many times does the driven gear turn?
17. 17.True or false: “spins faster with more V” is true of a servo motor. (a) True (b) False
18. 18.True or false: “good for lifting loads” happens when a small gear drives a big one. (a) False (b) True
19. 19.🦾 A servo moves from 20° to 60°. How many degrees does it turn?
20. 20.🔦 A light sensor reads 10 over black and 70 over white. A good threshold is halfway between them. What is it?
21. 21.🛞 How far does a wheel roll in one full turn? (a) its weight (b) its radius (c) its diameter (d) its circumference
22. 22.🧭 A robot spins 45° every second. How many seconds does it take to turn 225°?
23. 23.🛞 Which value of π is easiest for wheels of 7 cm, 14 cm or 21 cm? (a) 2/7 (b) 7/22 (c) 22 (d) 22/7
24. 24.🧭 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 0°. It turns right 60°, then right 120°, then left 135°. What does the gyro read now (0° to 359°)?
25. 25.True or false: “good for a slow crane” happens when a big gear drives a small one. (a) True (b) False
26. 26.🧭 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 180°, then right 30°. What does the gyro read now (0° to 359°)?
27. 27.⚙️ A 24-tooth driver gear turns an 8-tooth driven gear. The driver turns 1 time. How many times does the driven gear turn?
28. 28.🛞 A robot’s wheels have a diameter of 10 cm. Using π = 3.14, how far does the robot roll when the wheels turn 2 times (in cm)? =
29. 29.⚙️ A 10-tooth gear drives a 20-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
30. 30.🔍 For a robot’s controller, is a sensor an input or an output? (a) a wheel (b) an output (c) a gear (d) an input
31. 31.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 14 cm (use π = 22/7). The motor turns 12 times. How far does the robot roll (in cm)?
32. 32.🧭 A robot keeps turning right by 90° at a time. How many turns make one full circle?
33. 33.True or false: “usually turns 0° to 180°” is true of a DC motor. (a) True (b) False
34. 34.⬛ In a two-sensor line follower, both sensors see white. Where is the line? (a) between the two sensors (b) under the left sensor (c) under the right sensor (d) far behind it
35. 35.⚙️ An 8-tooth driver gear turns a 32-tooth driven gear. The driver turns 24 times. How many times does the driven gear turn?
36. 36.🧭 How many degrees is a right-angle turn? (a) 45° (b) 90° (c) 360° (d) 180°
37. 37.True or false: to stop before a wall, use a distance sensor. (a) False (b) True
38. 38.🛞 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 2 times. How far does the robot roll (in cm)?
39. 39.⚙️ Pulley A turns anticlockwise and drives pulley B with a crossed belt (it makes an X). Which way does pulley B turn? (a) clockwise (b) anticlockwise
40. 40.🧭 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 0°. It turns left 45°, then left 180°. What does the gyro read now (0° to 359°)?

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