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Unformatted text preview: MASSACHUSETTS INSTITUTE OF TECHNOLOGY Physics Department 8.01 Physics I Fall Term 2010 Exam 1, Solutions Name Section Table and Group With the exception of Problem 1, answers without work shown will not be given any credit. Comments on how you are approaching the problem and what you are doing at any given point will be helpful to the grader in awarding partial credit, as will carefully drawn free body diagrams when appropriate. Problem 1 (20 points) Problem 2 (25 points) Problem 3 (30 points) Problem 4 (25 points) Total (100 points) 1 Problem 1a (5 points) You are standing by a window and see a ball (thrown from below) moving up past the window. The ball is visible for a time interval Δ t up . On its way down the ball is visible for a time interval Δ t down . Neglecting the effects of air resistance, how do Δ t up and Δ t down compare? 1. Δ t up < Δ t down 2. Δ t up = Δ t down 3. Δ t up > Δ t down 4. Not enough information is given to determine an answer. Answer: 2 2 Problem 1b (5 points) X6D X32 X6D θ You place a single and a double brick on a level board and then slowly raise one end of the board. The double brick has twice the mass and twice the surface contact area as the single brick. The coefficients of static friction and kinetic friction are the same for each of the two bricks. Enter the numbers of any of the correct statements on the answer line below. 1. The single brick slides before the double brick. 2. The single brick slides after the double brick. 3. The single brick and double brick begin to slide at the same time. 4. The single brick has a greater acceleration than the double brick. 5. The single brick has a smaller acceleration than the double brick. 6. The single brick and the double brick have the same acceleration....
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This note was uploaded on 04/13/2011 for the course PHYSICS 8.01 taught by Professor Guth during the Fall '09 term at MIT.
 Fall '09
 guth
 Physics, Mass, Work

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