Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 950 · 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 wheel has a diameter of 21 cm. Using π = 22/7, what is its circumference (in cm)?
2. 2.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor runs forward and the right motor runs backward. What does the robot do? (a) goes straight back (b) turns right (c) goes straight forward (d) spins right on the spot
3. 3.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are shiny (b) they spread the weight (c) they spin in the air (d) they are round
4. 4.True or false: “drives the wheels” is true of a servo motor. (a) False (b) True
5. 5.🦾 A servo moves from 60° to 170°. How many degrees does it turn?
6. 6.⚙️ A 10-tooth gear drives a 30-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
7. 7.⚙️ A 16-tooth driver gear turns an 8-tooth driven gear. The driver turns 7 times. How many times does the driven gear turn?
8. 8.🔦 A light sensor reads 40 over black and 70 over white. A good threshold is halfway between them. What is it?
9. 9.True or false: “has a signal wire” is true of a servo motor. (a) True (b) False
10. 10.🛞 A robot’s wheels have a diameter of 6 cm. Using π = 3.14, how far does the robot roll when the wheels turn 2 times (in cm)? =
11. 11.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) add more wheels (c) paint it red (d) swap its two wires
12. 12.🦾 A servo program runs:
    angle = 180
    angle = angle − 60
    angle = angle + 10
    angle = angle + 50
    To what angle (in degrees) does the servo turn in the end?
13. 13.🔦 A robot has a left and a right light sensor. Below 50 means black. The left sensor reads 40 and the right sensor reads 70. Which sensor is over the black line? (a) the left sensor (b) the right sensor (c) neither sensor (d) both sensors
14. 14.🛞 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?
15. 15.🛞 A robot’s wheels have a diameter of 35 cm. Using π = 22/7, how far does the robot roll when the wheels turn 3 times (in cm)?
16. 16.⚙️ An 8-tooth driver gear turns a 24-tooth driven gear. The driven gear turns 9 times. How many times did the driver turn?
17. 17.📡 What does an ultrasonic distance sensor send out? (a) radio music (b) bright light (c) sound too high to hear (d) water drops
18. 18.📡 A robot is 230 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 1 second (in cm)?
19. 19.True or false: “the output is weaker” happens when a big gear drives a small one. (a) False (b) True
20. 20.📡 A robot is 230 cm from a wall and drives straight at it at 5 cm per second. How far from the wall is it after 16 seconds (in cm)?
21. 21.🛞 The diameter of a wheel is how many times its radius? (a) 3 (b) 1 (c) 4 (d) 2
22. 22.True or false: “soft snow” suits legs. (a) False (b) True
23. 23.🦾 A servo arm points right at 0°, straight up at 90° and left at 180°. It is set to 90°. Where does the arm point? (a) points left (b) points straight up (c) points up and right (d) points right
24. 24.🧭 A robot should turn right 90°, but its gyro shows it turned 88°. How many degrees must it turn more to the right?
25. 25.Which job needs a light sensor? (a) measure how far a box is (b) follow a black line (c) know a button is pressed (d) read a QR code
26. 26.🛞 A robot’s wheels have a diameter of 20 cm. Using π = 3.14, how far does the robot roll when the wheels turn 4 times (in cm)? =
27. 27.🛞 Circumference = π × … (a) speed (b) radius only (c) diameter (d) weight
28. 28.True or false: “good for a fast fan” happens when a big gear drives a small one. (a) False (b) True
29. 29.Which job needs a light sensor? (a) measure a turn angle (b) know a button is pressed (c) stop before a wall (d) find the brightest spot
30. 30.⚙️ Which gear set-up gives this: “the output is stronger”? (a) big drives small (b) small drives big
31. 31.True or false: “good for a racing toy” happens when a small gear drives a big one. (a) False (b) True
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 270°. It turns right 135°, then right 45°. What does the gyro read now (0° to 359°)?
33. 33.🧭 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 180°. It turns right 180°, then left 90°, then right 135°. What does the gyro read now (0° to 359°)?
34. 34.⚙️ An 8-tooth driver gear must make the driven gear turn 4 times slower. How many teeth must the driven gear have?
35. 35.🔍 Which sensor helps a robot feel a bump into a wall? (a) a camera (b) a light sensor (c) a temperature sensor (d) a touch sensor
36. 36.🛞 Why do most indoor robots use wheels? (a) fast and easy on floors (b) they float (c) they look funny (d) they climb stairs
37. 37.🔦 A light sensor reads below 50 over a black line and above 50 over the white floor. It reads 30. What is under the sensor? (a) the black line (b) the white floor
38. 38.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 90 turns a minute and the right wheel at 90 turns a minute. What does the robot do? (a) curves to the left (b) curves to the right (c) goes straight forward
39. 39.True or false: to feel a bump into a wall, use a touch sensor. (a) False (b) True
40. 40.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 10 turns a minute and the right wheel at 60 turns a minute. What does the robot do? (a) curves to the left (b) goes straight forward (c) curves to the right

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