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A simple Pendulum.

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Introduction

A simple Pendulum. AIM My aim in this experiment was to see if the length of the string the bob was attached to effected the time taken for one oscillation. RESEARCH What a pendulum is: A pendulum is a body suspended by a fixed point so it can swing back and forth under the influence of gravity. Pendulums are frequently used in clocks because the interval of time for each complete oscillation, called the period, is constant. What effects the time for one period? When the bob is moved from equilibrium either left or right and then is released, it oscillates in a vertical plane in the shape of an arc of a circle. This is then reversed back to its starting position. The weight pulling down on the pendulum bob causes the bob to accelerate towards its normal resting point. This acceleration can be calculated by the formula a = -gA. The angle size can also be linked to the arc length, this is shown in the formula, x = LA. With L being the length of the string. ...read more.

Middle

Below are some simple guidelines to ensure that our testing is fair. Procedure/Object Problem Solution Clamp Stand Could rock Place a heavy mass on the base to prevent this. Mass of the bob (see note below) If we use different bobs there mass could be different Make sure we use the same bob Angle Angle could be different Make sure we measure the angle accurately Gravity If we move to another area of the world, the effects of gravity will be slightly different Stay in the same area of the earth as much as possible. Human error Human error between releasing the bob and starting the stopwatch. Make sure the same person does each task every time, use a standard pre-release method, i.e. 3,2,1, go. We should also let the pendulum swing for ten periods and then divide by 10 to reduce the effect of human error. Note: Although during my research I ascertained that the mass of the bob does not effect the period of the pendulum, I should still keep this constant, as I should only have one variable in my experiment. ...read more.

Conclusion

My line of best fit shows that the time taken increases in a linear fashion and does not go through the point of origin. This shows me that the period does increase relative to the length of string, this supports my prediction that because of the length of the arc increasing with the length of the string that the period would increase. EVALUATION I believe that my experiment went reasonably well, the results we collected would seem to be very good and we had no accidents. I also believe that the method we used to obtain these results was an accurate one, but it could have been improved with the use of light gates and a computer because this would have removed the element of human error. I would like to take this investigation further by continuing to increase the lengths of the string until about one-meter. I would also like to try this experiment with different angles to see what effect that has on the results and then compare the results to these ones. The evidence I have here is only just enough to support a firm conclusion, but does show a trend appearing. ?? ?? ?? ?? Kenny Larsen Page 1 01/05/2007 ...read more.

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