S08Prelim1

# S08Prelim1 - Part I Multiple Choice Questions(50 points...

1 Part I: Multiple Choice Questions (50 points total) 1 . [1 point each] An object is moving along the x -axis. Given the sign of v x and the sign of a x , decide whether the object is speeding up or slowing down, and put a check mark ( ) in the appropriate boxes of the table: v x a x speeding up slowing down > 0 > 0 > 0 < 0 < 0 > 0 < 0 < 0 2. [3 points] You are skiing straight down a slope which is not steep but bumpy. Snow conditions are such that the coefficient of kinetic friction is the same everywhere. The friction force between you and the slope is strongest (A) On top of the bumps (B) In the dips between the bumps (C) Nowhere -- it is the same everywhere on the slope Answer __________ 3. [3 points] You are sitting on a chair. Newton’s Third Law partner to your weight is the force of
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