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#2 Can someone help me with the question, I’m confused.

Which of the following changes would best help students to determine how force affects a mass's
acceleration?
Choose 1 answer:
Attach wheels to M, to lower the friction between the mass and the table.
Vary the mass of M, over their different runs.
Vary the distance that M is allowed to travel.

A group of students is using the version of an atwood machine shown below to identify how an object's
mass affects its acceleration due to a force. The students have attached low-friction surfaces to the table
and the bottom of M. They are going to drop M, multiple times and measure M,'s acceleration on each
run.
Ma
Mb

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