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# AS3/ Expt-g/ Lekia

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### AS3/ Expt-g/ Lekia

1. 1. To Determine g HOMEWORK Date:05/10/09 AS3 Lekia
2. 2. Use Ticker Timer...
3. 3. G=mg We know the formula: F=ma The picture of ball breaker’s force analysis In the picture above,F=G. Because : F=ma,G=mg, Then : ma=mg a=g
4. 4. Like this… Steps: 1.Open ticker timer. 2.Release the top clip. 3.When the tape leave ticker timer,close the ticker timer. 4.Do like this for four times. 5.Gather the tapes.
5. 5. We get the tapes like this… Calculate a(average) 1.Choose three points on the tape,markO,A,B 2.MeasureOA and OB 3. △S ＝ OB-OA 4.Use the frequency of the ticker timer to calculate T 5.Because△S=at2,a=△S/t2 6.Deal with four tapes like these steps, then we get a1,a2,a3,a4 △S＝at2 We know the formula: f=1/T
6. 6. △ S/T2(m/s2) Average 4 3 2 1 △ S/m OB/m OA/m Make the table like this: Calculate a(average)=(a1+a2+a3+a4)/4= Because g=a g=a(average)=(a1+a2+a3+a4)/4=
7. 7. The source of errors: 1.The length of OA,OB 2.The resistance on the ball breaker
8. 8. Thank you 05/10/09 THE END