4.4 forces and motion Flashcards
1
Q
lift problems
(vertical motion)
A
acceleration (net) = acceleration up - g
F(net) = m(net acceleration)
2
Q
pulley problem quantities
A
m = mass of total system
acceleration/force = purely component of the system acting along that axis
3
Q
what is a fluid
A
anything that flows
(gas = compressible)
(liquid = incompressible)
4
Q
what is a drag force
A
a resistive force caused my moving through a fluid
(opposes the motion of an object)
5
Q
what is the magnitude of drag (air res) the instant an object starts falling)
A
0N
velocity is still 0 soo no force applied
