1. When the quantity m2 - m1 is increased for an Atwood machine,

(a) the acceleration decreases,
(b) F is maintained constant,
(c) the total mass may be maintained constant,
(d) mass is necessarily added to the system.

2. When the quantity m2 - m1 is increased and the quantity m2 + m1 is kept constant,

(a) the acceleration decreases,
(b) the acceleration does not change,
(c) the acceleration increases,
(d) it is impossible to change one quantity without changing the other.

3. When the quantity m2 + m1 is maintained constant in the experiment,

(a) mass is added and/or removed,
(b) the acceleration remains constant for all trials,
(c) the system moves with a constant velocity,
(d) the force is varied by transferring mass.

4. When the quantity m2 + m1 is increased and the quantity m2 - m1 is kept constant,

(a) the acceleration decreases,
(b) the acceleration does not change,
(c) the acceleration increases,
(d) it is impossible to change one quantity without changing the other.

5. If both m2 - m1 and m2 + m1 are varied for each experimental trial, then

(a) mass is necessarily added to the system,
(b) it is possible for the acceleration to remain constant,
(c) the net force remains constant,
(d) the total mass remains constant.