This was a experiment using the Atwood Machine, and graphs were plotted (net force vs. aexp)...
This was a experiment using the Atwood Machine, and graphs were plotted (net force vs. aexp) Describe how the following factors would increase or decrease the values you found for aexp (a) Air Resistance (b) Pulley Friction: (c) String Mass (d) Rotational Inertia of the Pulley
Homework Answers
If I understand correctly then 
is the
acceleration. Please correct me through the comments if that is not
the case.
(a) Air resistance is the force which always acts in a direction
opposite to the motion, therefore it will decrease .
(b) Pulley friction also provides a force which acts in a
direction opposite to the motion, hence again will
decrease.
(c) String mass will also decrease the acceleration ,
because some of the energy of the potential energy of the masses
will be used to provide kinetic energy to the string as it has mass
now.
(d)Finally, if the pulley has mass then then it will have
rotational inertial. Then a certain amount of the potential energy
of the masses will go to increase the rotational kinetic energy of
the pulley, therefore acceleration will again
decrease.
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