1. Specialist experiment
Goal
See how air effect motion of the balls with your eyes
Obtain data as accurate as possible
Tools
Sony video camera HDRPJ540TC tripod
Different balls
Vernier caliper ,Electronic balance
Projector, PC

2. Recording Select 5 different size / weight balls Set camera Drop balls
Drop from here
Select 5 different size / weight balls
Set camera
Drop balls
Measure size of tiles
Measure Height

3. Preparation of Big graph paper
Draw axis
Time(sec)
15/15
10/15
5/15 ０

4. Prepareation PC Connect USB on camera to PC Find MTS files
Copy them onto desktop
Right click on the file> select open with > select windows media player
Connect PC to projector
Right click on the windows media player>enhancements>play speed settings
Find first frame the ball dropped then pause video

5. Big graph paper
Set initial dropping position on point O
Draw axis
Time(sec)
15/15
10/15
5/15 ０
Plot lines every 10 blocks on the wall

6. Set initial dropping position on point O
Time(sec)
15/15
10/15
5/15 ０
Click forward button 4 time to
proceed 4 frame( 1/15 sec)

7. Set initial dropping position on point O
Time(sec) ０
10/15
5/15
15/15
Move paper

8. Set initial dropping position on point O
Time(sec) ０
10/15
5/15
15/15
Do until ball reached to the ground

9. Measure length of tiles on the paper
Find calibration curve
Set initial dropping position on point O
Time(sec) ０
10/15
5/15
15/15
Measured value
Unit>[cm]
10 tiles
=A4*A$2/100
20 tiles
30 tiles
40 tiles
50 tiles
Unit>[m]
60 tiles
New tab
Make graph
Right click any dot
Choose add trend line
Check polynomial
Order >2
Check Show formula

10. estimated curve ( ** this formula is example. Find your own!!)
Measure length of tiles on the paper
Find calibration curve
Set initial dropping position on point O
Time(sec) ０
10/15
5/15
15/15
Measure positions of balls
10 tiles
You can use same as theory tab
20 tiles
30 tiles
40 tiles
50 tiles
60 tiles
=(D7-D5)/2/A$2
New tab
= *C5^ *C
y = x x
estimated curve ( ** this formula is example. Find your own!!)
=(E8-E6)/2/A$2