CP Workbook
Falling and Air Resistance
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Bronco skydives and parachutes from a stationary helicopter. Various stages of fall are shown in positions
a
through
f
in the table shown below. Using Newton's 2nd law, find Bronco's acceleration at each position.
a = net F/m
a = (W - R)/m
You need to know that Bronco's mass,
m
, is 100 kg so his weight,
W
, is a constant 1000 N. The author is using the approximation, g = 10 m/sec
^{2}
. Air resistance
R
varies with speed and cross-sectional area.
a
b
c
d
e
f
Position
Acceleration
(m/sec
^{2}
)
a
b
c
d
e
f
When Bronco's speed is least, his acceleration is
least
most
In which position(s) does Bronco experience a downward acceleration?
a
b
c
d
e
f
In which position(s) does Bronco experience an upward acceleration?
a
b
c
d
e
f
When Bronco experiences an upward acceleration, his velocity is
still downward
upward also
In which position(s) is Bronco's velocity constant?
a
b
c
d
e
f
In which position(s) does Bronco experience terminal velocity?
a
b
c
d
e
f
In which position(s) is terminal velocity greatest?
a
b
c
d
e
f
If Bronco were heavier, his terminal velocity would be
greater
less
the same
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Paul G. Hewitt
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