The micro:bit has an accelerometer on board, you can see this in the picture below
When you flash the program, you should see a reading of the accelerometer x axis being printed at the bottom of the Mu application. You can move the Micro:bit around and the values should change
Code
from microbit import *
while True:
x = accelerometer.get_x()
print(x)
sleep(1000)
You can also use the get_y and get_z() methods to find out the readings on the other axes. here is an example showing this
from microbit import *
while True:
x = accelerometer.get_x()
y = accelerometer.get_y()
z = accelerometer.get_z()
print ("x: " + str(x) + " y: " + str(y) + " z: "+ str(z))
sleep(1000)