AP Physics 1 Question 141: Answer and Explanation
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1. Which of the following force diagrams could represent the forces acting on a block that slides to the right while slowing down?
Correct Answer: A
A-There's no such thing as the "force of motion," so motion does not belong on a force diagram. The block slows down, so the block has acceleration in the opposite direction of motion, or left. That means there must be a leftward force.