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Help with Acceleration

by Mirole
Tags: acceleration, average
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Mirole
#1
Sep7-09, 01:01 AM
P: 33
1. The problem statement, all variables and given/known data
The figure shows the motion diagram, made at two frames of film per second, of a ball rolling along a track. The track has a 3.0m-long sticky section.

http://img30.imageshack.us/img30/2278/screenshotkh.png <-- The graph with the coordinates
2. Relevant equations
a=v/t


3. The attempt at a solution
a=1.98-0/1.5-1
=3.96
a=3-2/2-1 = 1 + 3.96

I've tried a bunch of ways but could not get it
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loveequation
#2
Sep7-09, 01:35 AM
P: 39
You are asked to figure out the acceleration of the ball in the sticky section of the track.

(1) First determine the initial speed [itex] V_i [/itex]?
(2) Then determine the final speed [itex] V_f [/itex]?
(3) What is the distance [itex] x [/itex] over which this change in speed occurs?
(4) Have you learnt a formula which relates these three quantities? The formula
I am thinking of is [tex] V_f^2 - V_i^2 = 2 a x [/tex]. Then use this formula and
and ask your teacher if it is legitimate to do so.
Mirole
#3
Sep7-09, 04:01 PM
P: 33
Ok, I got it. Thanks!


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