If a 60kg girl jumps out of a helicoptor, draw diagrams to show the forces (with values) acting on her when a) she is in freefall, b) she is accelerating at half of g (g = 10 m/s^2), c) she is travelling at a constant speed?
a) 600N arrow down for weight, no air resistance arrow, acceleration = 10m/s^2
b) 600N arrow down, 300N arrow up for air resistance, acceleration = 5m/s^2 (Using F = ma)
c) 600N arrows up and down (forces balanced), no acceleration
EJ
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