Robotics Worksheet: Part 2 Test

Robotics lesson 20: Part 2 test: how robots move and sense · Set 810 · 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.🛞 What is the main difficulty with legs for a robot? (a) they never tire (b) they are too cheap (c) harder to balance (d) too fast on floors
2. 2.⚙️ A 20-tooth gear drives a 100-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
3. 3.🛞 Why do tracks (caterpillar belts) grip soft ground well? (a) they are round (b) they are shiny (c) they spread the weight (d) they spin in the air
4. 4.⚙️ Which gear set-up gives this: “the output is weaker”? (a) small drives big (b) big drives small
5. 5.⚙️ An 8-tooth driver gear turns a 24-tooth driven gear. The driver turns 12 times. How many times does the driven gear turn?
6. 6.🛞 The diameter of a wheel is how many times its radius? (a) 1 (b) 3 (c) 4 (d) 2
7. 7.🛞 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?
8. 8.⚙️ An 8-tooth driver gear turns a 40-tooth driven gear. The driver turns 15 times. How many times does the driven gear turn?
9. 9.📡 A distance sensor sends a sound pulse and hears the echo 17 ms later. Sound travels about 34 cm every millisecond. How far away is the object (in cm)?
10. 10.🧭 A robot faces north. It does: turn left, turn right. Which way does it face now? (a) east (b) west (c) south (d) north
11. 11.True or false: to stay balanced upright, use a gyro sensor. (a) False (b) True
12. 12.🛞 How far does a wheel roll in one full turn? (a) its radius (b) its diameter (c) its weight (d) its circumference
13. 13.🛞 A robot wheel has a radius of 7 cm. Using π = 22/7, what is its circumference (in cm)?
14. 14.🛞 Both wheels of a two-wheeled robot turn forward. The left wheel turns at 90 turns a minute and the right wheel at 50 turns a minute. What does the robot do? (a) curves to the right (b) goes straight forward (c) curves to the left
15. 15.⚙️ DC motor or servo motor: which one has just two wires? (a) a DC motor (b) a servo motor
16. 16.⚙️ A 10-tooth driver gear turns a 30-tooth driven gear. The driver turns 15 times. How many times does the driven gear turn?
17. 17.🛞 Which way of moving suits this best: “hovering over a roof”? (a) tracks (b) propellers (c) legs (d) wheels
18. 18.True or false: “turns to an exact angle” is true of a DC motor. (a) True (b) False
19. 19.🛞 A robot’s wheels have a diameter of 14 cm. Using π = 22/7, how many full turns must they make to roll 440 cm?
20. 20.🧭 How many degrees is a full turn? (a) 100° (b) 360° (c) 90° (d) 180°
21. 21.⚙️ Pulley A turns clockwise and drives pulley B with an open belt (no cross). Which way does pulley B turn? (a) anticlockwise (b) clockwise
22. 22.🛞 A robot has one motor on its left wheel and one on its right wheel. The left motor is stopped and the right motor is stopped. What does the robot do? (a) goes straight forward (b) stays still (c) spins right on the spot (d) goes straight back
23. 23.Which job needs a distance sensor? (a) warn if motors get hot (b) find the brightest spot (c) spot a red ball (d) measure how far a box is
24. 24.True or false: to follow a black line, use a light sensor. (a) False (b) True
25. 25.⚙️ A 10-tooth driver gear turns a 20-tooth driven gear. The driver turns 10 times. How many times does the driven gear turn?
26. 26.🛞 A robot wheel has a diameter of 7 cm. Using π = 22/7, what is its circumference (in cm)?
27. 27.⚙️ An 8-tooth driver gear turns a 24-tooth driven gear. The driven gear turns 3 times. How many times did the driver turn?
28. 28.Which of these suits wheels? (a) stepping over wide gaps (b) loose sand dunes (c) a muddy building site (d) a long factory floor
29. 29.🦾 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 right (b) points left (c) points straight up (d) points up and right
30. 30.⚙️ DC motor or servo motor: which one spins round and round? (a) a servo motor (b) a DC motor
31. 31.🧭 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 135°, then left 45°. What does the gyro read now (0° to 359°)?
32. 32.Which of these suits legs? (a) a field of tall boulders (b) flying over a field (c) a long factory floor (d) hovering over a roof
33. 33.🔢 To climb a steep ramp, a robot needs a gear ratio that is … (a) never important (b) small (fast, weak) (c) big (slow and strong) (d) zero
34. 34.⚙️ A 10-tooth driver gear turns a 10-tooth driven gear. Compared with the driver, how does the driven gear turn? (a) at the same speed (b) slower (c) faster
35. 35.⚙️ An 8-tooth gear drives a 40-tooth gear. What is the gear ratio (driven teeth ÷ driver teeth)?
36. 36.📡 An object is 187 cm from a distance sensor. Sound travels about 34 cm every millisecond. After how many milliseconds does the echo come back?
37. 37.🔢 Gear ratio = driven teeth ÷ … (a) driver teeth (b) wheel size (c) motor volts (d) number of gears
38. 38.📡 A robot is 120 cm from a wall and drives straight at it at 20 cm per second. How far from the wall is it after 4 seconds (in cm)?
39. 39.🛞 A motor’s 10-tooth gear drives a 30-tooth gear on the wheel axle. The wheels have a diameter of 35 cm (use π = 22/7). The motor turns 6 times. How far does the robot roll (in cm)?
40. 40.⚙️ How do you make a DC motor spin the other way? (a) shake it (b) swap its two wires (c) add more wheels (d) paint it red

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