# Lab_2 - Phys 151 Lab 2 Name Duties Name Duties Name Duties...

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Phys 151 Lab 2 Name ______________ Duties ______________________________________ Name ______________ Duties ______________________________________ Name ______________ Duties ______________________________________ For this lab you will complete two exercises. Below are the prelab write-ups that you should read and understand before you show up for the class. Print out a copy to bring to the lab . Exercise 1 Title: ACCELERATION OR Why did the Egg Cross the Road? Because it had the Inclination! Purpose Measure the time elapsed for a given distance that an object travels as it rolls down an incline, and graphically analyze its changing speed so as to demonstrate and “prove” the behavior of uniformly-accelerated motion in a straight line. Concept/Theory An object whose velocity is changing is said to be accelerating. When an object is sitting on a straight incline, its “effective weight” down the incline is modified from its true weight by a constant factor (less than 1) which depends upon the slope of the incline. Thus, if it is “unhindered” (i.e. free to move), the object will travel down the incline with an acceleration that is constant (since the slope of a rigid track does not change) but smaller than that of free- fall. This tweaking of the Earth’s gravitational acceleration provides us with the means to “slow down” free-fall so as to be able to see all of its effects. All the equations of the true free-fall-from-rest motion are retained here except for the value of the acceleration, where a is no longer 10 m/s 2 . Acceleration = a, v 0 = 0, v = a.t, v av = (v 0 + v)/2 = 1/2.a.t, d = 1/2.v.t = 1/2.a. t 2 = v av .t Materials stopwatch; meter stick; inclined ramp; books; steel ball. Procedure Part A - Low Incline 1. Set one end of an inclined ramp on a few books so that the ball will roll down on its own. 2. Mark 5 (about 15 cm apart) points on the ramp - use some of the holes along the ramp as these markers.

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3. Measure the time it takes the ball to travel from point A to the bottom of the ramp (BR) and record the segment time A-BR (t) and segment distance (d) in the table below. Do this a few times and take an average for each. 4. For the next set of rolls of the ball, measure the time it takes the ball to travel from point B to point BR (new t).
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## This note was uploaded on 02/08/2011 for the course PHYS 151 taught by Professor Lim during the Winter '10 term at Drexel.

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Lab_2 - Phys 151 Lab 2 Name Duties Name Duties Name Duties...

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