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PENDULUM

Transcript: Galileo Galilei is an italian astronomer,scientist, physicist, mathematician, philosopher and inventor. Some of his inventions were telescopes, a compass and a thermometer. Galileo studied in the University of Pisa. Galileo studied medicine but soon changed to study maths. The pendulum was noticed by Galileo Galilei, but made into a clock later by Christiaan Huygens. A pendulum is an object connected to a fixed support in such a way that it is free to swing back and forth under the influence of gravity. It is used to tell time or sometimes to tell if there was going to be an earthquakes. By-Aaisha.S Links- The pendulum: http://dictionary.reference.com/browse/pendulum When it was created and who created it: http://en.wikipedia.org/wiki/Pendulum Galileo Galilei: *http://www.britannica.com/EBchecked/topic/224058/Galileo *http://www.biography.com/people/galileo-9305220#early-life *http://www.sciencekids.co.nz/sciencefacts/scientists/galileogalilei.html How it works: Galileo Galilei Pendulum An example of a pendulum Bibliography It impacted the world because people could finally tell time most accurately. People could schedule their days and spend quality time doing things by this. An example of a Pendulum clock How did this invention impact Italy and the rest of the world PENDULUM A pendulum is made up of a string or solid rod with a weight attached to the end. Gravity is the force that keeps the pendulum moving. Pendulums are often used in clocks. The amount of time it takes for a pendulum to swing from one side to the other and back again is called a “period.” A pendulum whose period is 4 seconds takes 2 seconds to swing to the left and 2 seconds to swing back to the right. No not anymore due to modern technology but you can still use them if you want. Galileo Galilei was in the process of making the first pendulum clock in 1602 but he unfortunately died in 1642. Later on it was created into a clock by a dutch mathematician and scientist Christiaan Huygensen 1656. How it works When it was created and who created it? Is the invention still relevant?

Pendulum

Transcript: pendulums- Definition,independent,dependent variable and controlled Expiriment- Pendulum by Brooklyn Gould Variable means-anything that you can change that might effect the outcome.Pendulum means-a mass that hangs from a fixed point that is free to swing back and forth.Cycle means-any kind of motion that is able to repeat itself.And,the standard pendulum system means-a regular pendulum that measures 38 cm. And swings from a 90 degree angle! Definitions,Variable,Pendulum,Cycle and the Standard pendulum systems- SCIENTIFIC METHOD- First find a question,then do some research and construct hypotheses. warning,you may have to try again and will become false so,go to construct hypotheses again then test with experiments.And lastly,analyze results-draw conclusion.Then,you may find if hypotheses is true or false! F.Y.I.,the longer the pendulum,the less amount of swings you get!But,the smaller the pendulum,the more swings you get! First,you will need a string, a paperclip,a ruler and some tape.Next,lay the ruler flat to the table then,attach the tape to the ruler and make sure it sticks!with the string,make a loop and put it through the ruler that extends from the table.And,tie the string to the paperclip and slide the penny through the bottom end of the paperclip! Independent variable means-a variable that stands alone and unchanged the one you know before the expiriment.Dependent variables means-a variable that depends on other ones and is changed, the one you know after the expiriment.And controlled expiriment means-An expiriment in which one and only one variable is changed. How to make a pendulum-

Pendulum

Transcript: Pendulum Investigations We set out to investigate the effect of the length of string on the time period for one oscillation of a pendulum. We also set out to measure the effect of the height and ultimately the effect of GPE on the time period for one oscillation Method for investigating the effect of the length of string on the time period for the oscillation of a pendulum Set up pendulum at a 15 degree angle to the vertical and let pendulum go. Then time, using a stopclock, the amount of time taken for 20 oscillations and the divide by 20 to find the time period of one oscillations. Take readings at different values of length of string of intervals of 10 cm from 80-10cm. Length of String (cm) Time for 20 Time for 1 Oscillation (s) Oscillations (s) 80 72.20 3.61 70 69.00 3.45 60 61.20 3.06 50 52.40 2.62 40 43.80 2.19 30 35.20 1.76 20 29.20 1.46 10 19.60 0.98 Graph of Time of one Oscillation against Length of String squared This graph shows to us that the root of length of string on a pendulum is proportional to the time taken for one oscillation. Experiment 2 Set up pendulum at a height of 17.5cm above its position at rest let the pendulum go. Then time, using a stopclock, the amount of time taken for 20 oscillations and the divide by 20 to find the time period of one oscillations. Take readings at different values of height of string of intervals of 5 cm from 17.5-22.5cm. Height Total time Time/oscillation 17.5 32.38 1.619 22.5 32.56 1.628 27.5 32.93 1.647 32.5 33.35 1.6675 37.5 33.79 1.6895 42.5 34.40 1.7201 The Graph is curved says Bond Therefore that is all that matters Conclusion Results for investiating the effect of amplitude on the time for one oscillation. Method for investigating the effect of amplitude on the time of one oscillation RESULTS Thank You for Watching

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