Forces and Motion Question
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Morgan has a job working in a mine. She walks up and begins pushing a large rock that is sitting still. After a lot of shoving, she makes it start sliding across the floor. She pushes it to the edge of a cliff where it falls through the air onto a rolling conveyor belt which carries it to a machine to be crushed. At what point did the rock have the strongest friction?
- when it was sitting still
- when Morgan was pushing it
- when it was falling through the air
- when it was rolling on the conveyor belt