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

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

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

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

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

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)

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

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

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

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 =-0.0007*C5^2+0.2211*C5+0.0268 y = -0.0007x2 + 0.2211x + 0.0268 estimated curve ( ** this formula is example. Find your own!!) =(E8-E6)/2/A$2