AS3/ Expt-g/ Ann


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AS3/ Expt-g/ Ann

  1. 1. Physical Experiment Name: Ann Class:AS3
  2. 2. Aims : To determine g (acceleration of free fall) <ul><li>Instruments to be used: </li></ul><ul><li>-Ticker Timer & meter ruler & stand </li></ul>
  3. 3. Steps in doing experiment: <ul><li>Fix a slip of paper in the Ticker Timer and fix a counterweight on one side of the slip. </li></ul><ul><li>Fix the Ticker Timer on the stand which is on a level desk and make sure the slip is perpendicular. </li></ul><ul><li>Turn on the Ticker Timer and let it start dotting, then release the slip. </li></ul><ul><li>After the slip leaving the Ticker Timer , stopping the Ticker Timer . </li></ul><ul><li>Take the slip of paper and chose one part of the slip whose dots on it are clear ,then use the meter ruler to measure the length of this part as S /m. </li></ul><ul><li>Count the number of the dots in that part and record the number as n , then t =0.02s*( n -1). </li></ul><ul><li>The picture will be shown on the next page. </li></ul>
  4. 4. Picture: How to calculate g : 1.Using the equation of motion: s=ut+1/2 at*t (u=0) 2. Substituting L and t into the equation. 3.Caculating the quantity of a . 4. Do the experiment more than 3times and get the average quantity of a . 5. a is equal to g .
  5. 5. Source of errors: <ul><li>We may take wrong readings when we measure the length of the dots-- s . </li></ul><ul><li>We may take wrong readings when we calculate the acceleration . </li></ul><ul><li>We may take wrong readings because there is air resistance and friction when we are making experiment. </li></ul>
  6. 6. To decrease the errors------ We have to do the experiment at least three times!
  7. 8. Thanks for watching!