Apply: force, mass, and acceleration

Three teams of students are designing an experiment to study the relationship between the mass of an object and its acceleration due to a force. All three teams are using the variation of an atwood machine shown below.

Team 1 varies the mass of $M_{\text{b}}$‍ and measures the time $M_{\text{b}}$‍ takes to reach the floor for each mass.

Team 2 adds low-friction wheels to $M_{\text{a}}$‍. Then, they vary the mass of $M_{\text{b}}$‍ and measure the time that $M_{\text{b}}$‍ takes to reach the floor for each mass.

Team 3 adds low-friction wheels to $M_{\text{a}}$‍. Then, they measure the time it takes $M_{\text{b}}$‍ to reach the floor.