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Pendulum Investigation

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Introduction

Pendulum Investigation A Pendulum is an object that swings back and forth around a fixed point if it is pulled aside and let go. Gravity makes it swing back and forth at a regular rate. The simple pendulum consists of a weight hanging at the end of a string or wire. The path travelled by the weight is called the arc of the pendulum. The period of oscillation is the time it takes the weight to pass back and forth once over this arc. The Italian physicist Galileo discovered the laws of the pendulum. He noticed that a hanging lamp would swing with an almost constant period, whether the arc was large or small. ...read more.

Middle

Therefore, in the above diagram, we can prove that the shorter the length of string, the faster it swings. D1 has the length of string 4, D2 9, and D3 16. If we put that into the formula, then we see that: D1. T= 2 D2. T= 3 D3. T= 4 This shows that my prediction was correct, D3 would take longer to swing. I also predict that different weight on the end of the string will make no difference to how fast the pendulum swings. I used my scientific knowledge, and a formula to work this out. Here is the formula : Acceleration is always the same, and all mass hits the ground at the same time. ...read more.

Conclusion

We used the range 10 cm, 20 cm, 30 cm, 40 cm, 50 cm, and 60 cm. We used the angle 90"a and weight 50 g. We timed 3 swings for each length and then worked out the average. Then we changed the angle we dropped the pendulum from. We used the range of degrees 30"a, 60"a, 90"a, 120"a, 150"a, 180"a. We used the weight 50 g and the length of string 30 cm. We then worked out the average again. All the results and averages were round up to 2 decimal places. Here are the results that we got: For weight change: For length change: For angle change: We made our results into graphs. My results show that my predictions were correct.. As you can see from the Pendulum Weight Changing Graph, the average is directly proportional to the length of string. As one increases, so does the other. ...read more.

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