# Guide to calculate the Friction Coefficient using CBR and

### Pages to are hidden for

"Guide to calculate the Friction Coefficient using CBR and"

```					   Guide to calculate the Friction
Coefficient using
CBR and a Graphing Calculator
Make sure you
have the graphing     Photo 1

calculator   (model
TI-83 Plus), a CBR
motion sensor and     APPS

a connecting cable.

ON

Oct. 5th, 2005                       1
Turn the calculator ON,
by pressing the button
on the bottom left.
You might get an          Photo 2

opening screen that
looks like this

Then press the blue
APPS button, to get
this screen:
Photo 3

Oct. 5th, 2005                      2
Press            , to get this screen:

Photo 4

Press any key. You will
get this screen:
Photo 5

Press            (Data Logger).
Oct. 5th, 2005                              3
Make sure that the following
set-up is repeated:         Photo 6

( Use the arrow keys                  for selection).

Click the “down” arrow                 until the word
“GO…” is highlighted.

Press             (Enter)
Oct. 5th, 2005                                         4
The following
screen should
appear:
Photo 7
Press

Press
Photo 8

Oct. 5th, 2005             5
Make sure that the
connecting cable is
attached to the
calculator from the
Photo 9
CBR.
Press

Set the CBR down on the ground, so that it is
.

lying on its side. Point it in the direction you will
roll your ball. Hold the ball up against the motion
sensor. When you are ready to begin collecting
data, have one partner press ENTER and roll your
ball in a straight line away from the CBR
Oct. 5th, 2005                                   6
It may take a few          Photo 10

tries before you can
get your ball to roll in
a straight line in front
of the sensor, but
eventually, you
should get a graph
that looks like this:      Photo 11

Oct. 5th, 2005                        7
Using the left and right arrow keys                , choose
the first point of the graph when the curve just
starts to depart from the horizontal axis. Call this
point t , x   t , 0 . Choose another two points on
0    o   0

the curve and call them t1 , x1 and t 2 , x2 .
Both Vo and  can be calculated using the
relation:

g
x  xo  Vo t  t o          t  t    2
o
2

Oct. 5th, 2005                                              8
Using t1 , x1  and t 2 , x2  , you will obtain two
equations in two unknowns,Vo ,  , which can be
solved by either substitution or elimination. Please
refer to the handout for a detailed solution of the
present problem.

Oct. 5th, 2005                                    9

```
DOCUMENT INFO
Shared By:
Categories:
Stats:
 views: 33 posted: 5/8/2010 language: English pages: 9