Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 602 · 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 21 cm. Using π = 22/7, how many full turns must they make to roll 462 cm?
2. 2.⚙️ How do you make a DC motor spin the other way? (a) swap its two wires (b) add more wheels (c) shake it (d) paint it red
3. 3.True or false: “the output is stronger” happens when a small gear drives a big one. (a) True (b) False
4. 4.📡 A robot stops if an object is closer than 100 cm. Its distance sensor hears the echo after 1 ms (sound: about 34 cm per ms). Does the robot stop? (a) No (b) Yes
5. 5.🦾 A servo program runs:
   angle = 170
   angle = angle − 30
   angle = angle + 10
   To what angle (in degrees) does the servo turn in the end?
6. 6.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 21 cm (use π = 22/7). The motor turns 15 times. How far does the robot roll (in cm)?
7. 7.📡 What does an ultrasonic distance sensor send out? (a) sound too high to hear (b) radio music (c) bright light (d) water drops
8. 8.⚙️ A 12-tooth gear drives a 36-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
9. 9.📡 A robot is 250 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 12 seconds (in cm)?
10. 10.🛞 A robot wheel has a diameter of 35 cm. Using π = 22/7, what is its circumference (in cm)?
11. 11.🧭 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 135°, then right 120°. What does the gyro read now (0° to 359°)?
12. 12.🔍 For a robot’s controller, is a sensor an input or an output? (a) a gear (b) an output (c) a wheel (d) an input
13. 13.True or false: “the output turns slower” happens when a big gear drives a small one. (a) True (b) False
14. 14.🧭 How many degrees is a half turn (turn around)? (a) 180° (b) 360° (c) 90° (d) 45°
15. 15.📡 A robot stops if an object is closer than 30 cm. Its distance sensor hears the echo after 4 ms (sound: about 34 cm per ms). Does the robot stop? (a) Yes (b) No
16. 16.🛞 Circumference = π × … (a) radius only (b) diameter (c) weight (d) speed
17. 17.🔍 Which sensor helps a robot stop before a wall? (a) a gyro sensor (b) a light sensor (c) a distance sensor (d) a sound sensor
18. 18.⚙️ DC motor or servo motor: which one drives the wheels? (a) a servo motor (b) a DC motor
19. 19.⚙️ Which gear set-up gives this: “the output is weaker”? (a) small drives big (b) big drives small
20. 20.🧭 A robot should turn right 90°, but its gyro shows it turned 94°. How many degrees must it turn back to the left?
21. 21.True or false: “drives the wheels” is true of a DC motor. (a) False (b) True
22. 22.🛞 Which way of moving suits this best: “a smooth classroom floor”? (a) legs (b) tracks (c) wheels (d) propellers
23. 23.Which of these suits legs? (a) crossing stepping-stones (b) a muddy building site (c) soft snow (d) loose sand dunes
24. 24.⚙️ A 15-tooth driver gear must make the driven gear turn 2 times slower. How many teeth must the driven gear have?
25. 25.🛞 A robot wheel has a diameter of 14 cm. Using π = 22/7, what is its circumference (in cm)?
26. 26.⚙️ A 50-tooth driver gear turns a 10-tooth driven gear. The driver turns 9 times. How many times does the driven gear turn?
27. 27.🛞 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)?
28. 28.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 75 and the right sensor reads 80. Which sensor is over the black line? (a) neither sensor (b) both sensors (c) the right sensor (d) the left sensor
29. 29.🧭 A robot spins 15° every second. How many seconds does it take to turn 300°?
30. 30.📡 An object is 306 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
31. 31.⚙️ A 15-tooth driver gear turns a 30-tooth driven gear. The driver turns 18 times. How many times does the driven gear turn?
32. 32.🧭 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 left 135°, then right 120°. What does the gyro read now (0° to 359°)?
33. 33.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 15 and the right sensor reads 40. Which sensor is over the black line? (a) the right sensor (b) the left sensor (c) both sensors (d) neither sensor
34. 34.🔍 Which sensor is just a tiny switch pressed by a bump? (a) a sound sensor (b) a gyro sensor (c) a touch sensor (d) a camera
35. 35.🧭 A robot should turn right 180°, but its gyro shows it turned 191°. How many degrees must it turn back to the left?
36. 36.⚙️ A 20-tooth gear drives an 80-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
37. 37.📡 A robot is 120 cm from a wall and drives straight at it at 15 cm per second. How far from the wall is it after 5 seconds (in cm)?
38. 38.🔦 A light sensor reads 20 over black and 60 over white. A good threshold is halfway between them. What is it?
39. 39.🧭 A robot spins 15° every second. How many seconds does it take to turn 90°?
40. 40.⚙️ A 36-tooth driver gear turns a 10-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) slower (b) at the same speed (c) faster

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