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Misconception FMM116:

When force arrows are used to represent opposing forces, students think the greater force wins so that the total force is equal to the value of the greater force (AAAS Project 2061, n.d.).

Items that test for misconception FMM116 in this project (Original Project) and key idea (The magnitude of two forces can be …)
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The length of force arrows pointing on an object from opposite directions can be used to determine the total force on the object.