Forces By Demons (FBDs)

A follow-up to Friction does not oppose motion, for Shruba and the Twisted Mouse:

Forces by demons,
and by engine elves,
and forces of motion
belong on same shelves.

Friction does not oppose motion!

You can’t, of course
walk or drive, with
no friction force.
Please tell your kith
and tell your kin:
You can’t begin
without friction.

cautionary example

or “mechanical disadvantage”:

Alas poor Spidey, poor Spidey is dead!
She’s hunted her last, and now she is spread
flat as a pancake, behind the door.
She made a mistake, and now she’s no more.

F=ma (is over-rated)

Newton’s second
is all they know –