Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 976 · 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: “soft snow” suits tracks. (a) False (b) True
2. 2.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
3. 3.📡 A robot is 100 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)?
4. 4.⚙️ 5 gears are in a row, each meshed with the next. Gear 1 turns anticlockwise. Which way does gear 5 turn? (a) clockwise (b) anticlockwise
5. 5.🔢 Gear ratio = driven teeth ÷ … (a) number of gears (b) motor volts (c) wheel size (d) driver teeth
6. 6.⚙️ Which gear set-up gives this: “good for a fast fan”? (a) small drives big (b) big drives small
7. 7.📡 A distance sensor sends a sound pulse and hears the echo 11 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
8. 8.🔦 A light sensor reads 10 over black and 60 over white. A good threshold is halfway between them. What is it?
9. 9.🔦 A light sensor reads 10 over black and 70 over white. A good threshold is halfway between them. What is it?
10. 10.🔍 Which sensor helps a robot stay balanced upright? (a) a touch sensor (b) a sound sensor (c) a temperature sensor (d) a gyro sensor
11. 11.⚙️ DC motor or servo motor: which one holds a set angle? (a) a DC motor (b) a servo motor
12. 12.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) big (slow and strong) (b) zero (c) small (fast, weak) (d) never important
13. 13.Which of these suits legs? (a) a muddy building site (b) loose sand dunes (c) a field of tall boulders (d) soft snow
14. 14.🔍 Which sensor helps a robot know a button is pressed? (a) a temperature sensor (b) a touch sensor (c) a gyro sensor (d) a light sensor
15. 15.⚙️ 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 small driver gear (b) a big driver gear
16. 16.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) clockwise (b) anticlockwise
17. 17.🧭 A robot should turn right 180°, but its gyro shows it turned 185°. How many degrees must it turn back to the left?
18. 18.⚙️ A common servo can turn from 0° up to about … (a) 18° (b) 180° (c) 10° (d) 1800°
19. 19.⚙️ A 36-tooth driver gear turns a 24-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) faster (c) at the same speed
20. 20.📡 A distance sensor sends a sound pulse and hears the echo 19 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
21. 21.🔢 A gear ratio of 3 (driven ÷ driver) means the driven gear turns … (a) 3 times louder (b) 3 times bigger (c) 3 times slower (d) 3 times faster
22. 22.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how far does the robot roll when the wheels turn 9 times (in cm)?
23. 23.True or false: “drives the wheels” is true of a servo motor. (a) True (b) False
24. 24.True or false: “good for a slow crane” happens when a small gear drives a big one. (a) True (b) False
25. 25.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how many full turns must they make to roll 1056 cm?
26. 26.⚙️ DC motor or servo motor: which one spins faster with more V? (a) a servo motor (b) a DC motor
27. 27.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 30°?
28. 28.🛞 A robot’s wheels have a diameter of 42 cm. Using π = 22/7, how many full turns must they make to roll 924 cm?
29. 29.🔦 A light sensor reads below 40 over a black line and above 40 over the white floor. It reads 20. What is under the sensor? (a) the white floor (b) the black line
30. 30.🛞 A small free-turning wheel that only helps a robot balance is called … (a) a gear (b) a track (c) a servo (d) a caster wheel
31. 31.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor runs forward. What does the robot do? (a) goes straight forward (b) turns left (c) spins left on the spot (d) goes straight back
32. 32.True or false: to start on a hand clap, use a gyro sensor. (a) True (b) False
33. 33.⚙️ A 20-tooth gear drives a 40-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
34. 34.🦾 A servo turns 60° every 100 ms. How many milliseconds does it take to turn 60°?
35. 35.🛞 Which way of moving suits this best: “crossing stepping-stones”? (a) tracks (b) legs (c) wheels (d) propellers
36. 36.🛞 With the same motor speed, a bigger wheel makes the robot go … (a) backwards (b) slower (c) faster (d) nowhere
37. 37.True or false: “the output is stronger” happens when a small gear drives a big one. (a) False (b) True
38. 38.📡 A robot is 300 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 8 seconds (in cm)?
39. 39.🛞 A robot wheel has a diameter of 42 cm. Using π = 22/7, what is its circumference (in cm)?
40. 40.True or false: “flying over a field” suits propellers. (a) False (b) True

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