CHAPTER 5 - COLLISION DETECTION

1. If the threshold value is set to high, rero:micro ........

• not avoid rero:micro damaged

• can avoid false triggers

• can register a collision even though the impact is not strong enough

• not register a collision if the impact is not strong enough

2. What is the measurement unit used to measure acceleration in an inbuilt accelerometer ?

• gram (g)

• kilogram (kg)

• miligram (mg)

• nanogram (ng)

3. 1 g of gravitational acceleration is

• 9.81 m/s²

• ~9.801 m/s²

• ~9.8001 m/s²

• ~9.81 m/s²

4. Accelerometers are used for the following functions, EXCEPT ______

• Car crash detection

• Smartphone screen rotation

• Obtain geographical location

• Drone stabilisation

5. What is motion sensor on the micro:bit?

• Accelerometer

• Compass sensor

• Micro:bit doesn't have a motion sensor

• Combination of Accelerometer and Compass

6. We use centimeter (cm) to measure reading of ultrasonic sensor. What is the measurement unit used to mesure readings on "accelerometer"?

• mg, as in "1/1000th of a single unit of g (gravitational acceleration)"

• ⁰, as in "degrees"

• g, as in "gram"

• kg, as in "kilogram"

7. Based on coding below,I want to programmed my micro:bit to display "Excuse Me" on the LED matrix. Which block you need to change?

• pause(ms) 100

• acceleration (mg) y

• show string "Hello"

• y-axis

8. Where you can find acceleration block in the toolbox?

• Variables

• Basic

• Input

• Logic

9. Image below shows 3 different axis of an accelerometer. Can you help matching (A), (B) and (C), with the matching is correct?

• A - Z axis

• B - L axis

• C - Y axis

10. Accelerometer are widely used in ___________

• in space shuttle navigation

• drone stabilisation

• smartphone screen rotation

• car crash detection