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# AS3/ Expt-g/ Sarah

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### AS3/ Expt-g/ Sarah

1. 1. How to measure “g” AS3 SARAH
2. 2. THE FIRST METHOD <ul><li>Let the stone of a known mass “m” hanging over the spring balance. </li></ul><ul><li>After the balance , read the reading of “G” </li></ul><ul><li>Use the fornula : G=mg to deduce g=G/m </li></ul>
3. 3. THE SECOND METHOD <ul><li>Regulating the valve of taps . Let the drop drops in the same time . </li></ul><ul><li>Use the watch to measure the time (T) of N drop drops (N between 50 to 100) </li></ul><ul><li>Use the ruler to measure the height (h) of the distance which drop drops . </li></ul><ul><li>Use the formula t=T/(N+1) and (1/2)g(2t)^2=H to deduce that </li></ul>
4. 4. THE THIRD METHOD <ul><li>Let the pendulum fixed to the formwork table. </li></ul><ul><li>Use the ruler to measure the length of thread (l) . Use the ruler and triangle to measure the diameter (d) of swing ball. Calculate the length of swing L=l+d/2 </li></ul><ul><li>Let the pendulum swing in a small range in the same plane. Starting the time from the lowest point . Calculate n times that it swing (n between 30 to 50) . The time of Vibrationis t . Calculate T=t/n </li></ul><ul><li>The formula is g=4π^2L/t </li></ul>
5. 5. THE FORTH METHOD <ul><li>Use ticker timer to have the experiment. </li></ul><ul><li>Measure the distance of the random two ponits. </li></ul><ul><li>Use the formula △s=at^2 to deduce g=(△s)/t^2 </li></ul>
6. 6. THE FIFTH METHOD <ul><li>Let the Pendulum do uniform circular motion in horizontal . </li></ul><ul><li>Use the ruler to measure the height of the cone (h) . </li></ul><ul><li>Use the watch to measure the time (t) which the swing ball swing n times . </li></ul><ul><li>Then the angular of swing ball is ω=2πn/t </li></ul><ul><li>The Centripetal of swing ball is F=mgtgθ . </li></ul><ul><li>tgθ=r/h so mgtgθ=mω2r </li></ul><ul><li>The final formula is g=4π2n2h/t2. </li></ul>
7. 7. THE SIXTH METHOD <ul><li>Let the ball fall over from H . Ball from the bottom end of the level of speed v for Horizontal Projectile Motion . Falls on the end of the level from its pedal slots for H’ level on the ground . Pedal with the landing point of the horizontal distance of S . Use stop watch to measure the time t which passed H’ . The first velocity which the ball do horizontal projectile motion is v=S/t. </li></ul><ul><li>By the law of conservation of mechanical energy was mgH=mv2/2 . So g=v2/2H=S2/2Ht2 </li></ul>