Posted by Angie on Monday, January 25, 2010 at 12:23am.
a) If 669 N is the upward pull and 682 is the downward pull, what additional force is needed to make a net force of zero?
The net force must be zero because (they say) the skydiver has constant speed.
b) They have already told you what the forces are; air resistance, gravity an the parachute straps pulling up. The "interacting partners" are the things applying those forces; (1) the atmosphere (2) the earth and (3) the parachute.
c) The parachute is acted upon by the atmosphere, the cords leading to the skydiver and gravity (its own weight). You figure out the reaction partners.
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