A Is For 'A'! Letters F & G

"F Is For 'F'!"

     When 
temp's portray'd in 
Centigrade at 
31 de-
grees,
     if 
'F' I write (for 
'Farenheit'), who'd 
not expect to 
freeze...?!

"G Is For 'G'!"

  Though
gravity reads
'1' at sea, in-
side my centri-
fuge
     I 
crank up 'G's (a 
prank!) by threes and 
simulate a 
luge.