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C
OPYING PERMITTED PROVIDED
TI
COPYRIGHT NOTICE IS INCLUDED
30
G
ETTING
S
TARTED WITH
CBR
© 1997 T
EXAS
I
NSTRUMENTS
I
NCORPORATED
Activity 5—Rolling ball
parabolic
Data collection
➊
Answer question 1 on the activity sheet
. Set the ramp at a 15° incline. Attach the
clamp to the top edge of the ramp. Attach the
CBR
to the clamp. Open the sensor head
and position it perpendicular to the ramp. Attach the calculator to the
CBR
.
Mark a spot on the ramp 0.5 meters (1.5 feet) from the
CBR
. Have one student hold the
ball at this mark, while a second student holds the calculator.
Hints:
Aim the sensor directly at the ball and make sure that there is nothing in the
clear zone
(see page 7).
➋
Run the
RANGER
program (see page 5 for keystrokes for each calculator). From the
MAIN
MENU
choose
SETUP
à
SAMPLE
.
➌
Press
›
to display the settings. For this activity, they should be:
REALTIME:
NO
TIME (S):
3 SECONDS
DISPLAY:
DISTANCE
BEGIN ON:
[ENTER]
SMOOTHING:
LIGHT
UNITS:
METERS
Instructions for changing a setting are on page 38.
➍
When the settings are correct, choose
START NOW
. Press
›
to begin sampling.
➎
When the clicking begins, release the ball immediately (don’t push) and step back.
➏
When the sample is complete, the Distance-Time plot is displayed automatically.
Answer questions 2 and 3.
➐
Press
›
to display the
PLOT MENU
. Choose
PLOT TOOLS
, and then choose
SELECT
DOMAIN
. Move the cursor to where the ball was released, and then press
›
. Move
the cursor to where the ball reached the end of the ramp, and then press
›
. The
plot is redrawn, focusing on the portion of the sample that corresponds to the ball
rolling down the ramp.
Answer questions 4 and 5.