pxt-calliope/docs/lessons/glowing-pendulum/quiz-answers.md
2016-04-01 16:22:47 -07:00

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# glowing pendulum quiz answers
construct a pendulum that glows using acceleration.
## Name
## Directions
Use this activity document to guide your work in the [glowing pendulum tutorial](/microbit/lessons/glowing-pendulum/tutorial)
Answer the questions while completing the tutorial. Pay attention to the dialogues!
## 1. Why are you creating a 'forever' loop?
<br/>
We are creating a forever loop to constantly display the appropriate brightness on the LED display.
## 2. Write the line of code to measure the acceleration with respect to the "y" axis and store this value in a local variable called 'acceleration'.
<br/>
```blocks
let acceleration = input.acceleration("y")
```
## 3. After storing the acceleration in a variable, write the code to take the absolute value of the acceleration, and store this value inside 'acceleration'.
<br/>
```blocks
let acceleration = input.acceleration(Dimension.X)
let accelerationAbsolute = Math.abs(acceleration)
```
## 4. Write the code to use the acceleration value from question 3 to set the brightness on the BBC micro:bit.
<br/>
```blocks
let accelerationX = input.acceleration(Dimension.X)
let accelerationAbsolute = Math.abs(accelerationX)
let accelerationDivided = accelerationX / 4
led.setBrightness(accelerationX)
```
## 5. Write the code that tuns all the LEDs on (as the image displays below)
![](/static/mb/lessons/glowing-pendulum-1.png)
<br/>
```
led.plotAll()
```