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Apply: force, mass, and acceleration

Problem

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.
A device with a pulley system rests on the ground. The device has a flat bottom and top. Resting on the left side of the top is mass M sub a. A string extends from this mass to the right edge of the surface where the string goes over a pulley and down to a small house shaped frame with a flat shelf on the bottom. Two small rectangular shapes rest on the shelf. The entire framed shelf, labeled M sub b, is suspended by the string just above the ground.
Team 1 varies the mass of M, start subscript, start text, b, end text, end subscript and measures the time M, start subscript, start text, b, end text, end subscript takes to reach the floor for each mass.
Team 2 adds low-friction wheels to M, start subscript, start text, a, end text, end subscript. Then, they vary the mass of M, start subscript, start text, b, end text, end subscript and measure the time that M, start subscript, start text, b, end text, end subscript takes to reach the floor for each mass.
Team 3 adds low-friction wheels to M, start subscript, start text, a, end text, end subscript. Then, they measure the time it takes M, start subscript, start text, b, end text, end subscript to reach the floor.
Which team’s procedure would best determine how force affects a mass’s acceleration?
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