Physics Hl Lab Report No1

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Konstantinos Tsagaris LAB REPORT 1 (the simple pendulum) Research question: The point of this experiment was to observe and justify how the time it takes for a pendulum to do an oscillation depends on the length of the rod holding the bob. Independent variable: length of the massless rod Dependent variable: period of a swing Control variables: mass of the bob, limited pivot, amplitude Hypothesis: I expect the period of the oscillation to be proportional to the length of the rod. Apparatus used: frictionless pivot, massless rod, massive bob, stopwatch, ruler, calculator How I change the IV: Since the massless rod, in my case, was a string tied around the pivot I changed its length by unwrapping it and I measured it with the ruler. How I measure the DV: In order to have more valid results I measured the time it took for the bob to oscillate 5 times with the stopwatch. Keeping the controlled variables constant: By doing some calculations and finding the position from which I would let the bob start to swing I measured its distance from the horizontal of the pivot by using the ruler in order to keep a constant amplitude. Also I used the same ruler and stopwatch in every data collection so that I wouldn’t have different uncertainties. Range of the IV: 40cm,60cm,80cm,100cm,120cm Times of DV measurement: 5 measurements for each value of the IV Raw data: Time taken for 5 oscillations (s) +0.1s (because of the decimal limit of the stopwatch I used) | Length (cm)+0.1cm | 1st trial | 2nd trial | 3rd trial | 4th trial | 5th trial | All trials | 6.4 | 6.4 | 6.3 | 6.3 | 6.4 | 40.0 | 7.7 | 7.8 | 7.7 | 7.8 | 7.8 | 60.1 | 9.1 | 9.1 | 9.1 | 9.0 | 9.0 | 81.7 | 10.1 | 9.7 | 10.2 | 9.8 | 10.1 | 100.2 | 10.9 | 11.1 | 11.0 |

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