Center of Circular Turn - General Physics - Past Paper, Exams of Physics

Download Center of Circular Turn - General Physics - Past Paper and more Exams Physics in PDF only on Docsity! St. Vincent College PH 111: General Physics I Exam III 10/15/2004 The exam consists of 4 questions. There will be 50 minutes to complete the exam. The questions may not be worth the same number of points, read the entire exam before beginning work. Put your name on all pages. Problem 1 25 Problem 2 20 Problem 3 30 Problem 4 25 Total 100 1. (25 pts) a) (5 pts) Is the force of friction on an object that is not moving always equal to µsN? (Explain.) b) (5 pts) Which would require less force to keep an object moving at a constant speed across a hori- zontal surface with friction (and why): (a) Pushing the object to the right and slightly downward or (b) pulling on the object to the right and slightly upward? c) (5 pts) A block rests on an inclined plane with enough friction to prevent sliding down. To start the block moving, is it easier to push it up the plane, down the plane, or sideways? Why? d) (5 pts) How does increasing the bank of a curved road help the cars round the turn in less-than-ideal (ie. more slippery) conditions? (It may help to think about, or draw, the forces acting on the car towards the center of the circular turn.) e) (5 pts) An astronaut is in orbit around the earth. How does her weight while in orbit compare to her weight when on the ground? Explain your answer.