Respuesta :

CeciliaHampton
Gravity is pulling you down and friction is slowing you down so you don't plummet to the ground at super high speeds.
AL2006
1). The force of bravado, machismo, and testosterone, propelling you forward, to DO THIS and impress your woman.

2). The force of reason and self preservation, telling you that this is crazy, and you must NOT jump out of a perfectly good airplane that's not on the ground.