S08Prelim1

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

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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 (A) The chair on you. (B) You on the chair. (C) The earth on the chair. (D) The chair on the earth (E) The earth on you. (F) You on the earth Answer __________

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2 4 . [6 points] The F–x graph shown at the right was obtained with LoggerPro using a single spring. Each graph below was obtained using two springs identical to this one, connected either in series or in parallel. (a) The springs that resulted in Graph (a) were connected in A) series B) parallel ____________ (b) The springs that resulted in Graph (b) were connected in A) series B) parallel _____________ (c) The springs that resulted in Graph (c) were connected in A) series B) parallel ___________ 0 5 10 15 20 25 0.00 0.05 0.10 0.15 0.20 0.25 Distance (m) Force (N) 0 5 10 15 20 25 0.00 0.05 0.10 0.15 0.20 0.25 Distance (m) 0 5 10 15 20 25 0.00 0.10 0.20 Distance (m) 0.30 0.40 0.50 0 5 10 15 20 25 0.00 0.05 0.10 0.15 0.20 0.25 Distance (m)
3 5. [1 point each] You are bouncing a beach ball in the lab. In each case, indicate whether the force is (A) Up (B) Down (C) Zero When the ball is in the air on its way up, the forces acting Gravity

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## This note was uploaded on 02/25/2009 for the course PHYS 1112 taught by Professor Leclair,a during the Fall '07 term at Cornell.

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

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