We didn't create a human pendulum, but we did play with the length of the pendulum to see how it affects the period and frequency. Each group used a weight, or bob, on a long string to create a pendulum. Then, they measured the frequency (# of swings in a minute) and figured out period length (how long it takes for one complete swing.) Then, it was time to shorten the string. After testing several lengths, the results were pretty clear! We went over how to plot the results on a line graph, learning how to label the axis and then find each data point from the table on the graph. Once the points were all marked, they drew lines to connect the dots, giving them a picture of what happens as the string in our pendulum went from 10 cm to 90 cm. Lots of discussion today about precision and accuracy in measurement and being consistent so we could be sure we were testing one variable and not unintended variables. The groups did their best to set up their pendulum the same for each test with only the string length changing. The youngest class spent some time playing with the pendulums, timing the difference between three different length pendulums, as well as one that was a different weight. They diagramed the difference between a long pendulum and a short one in their lab books. We talked about how gravity causes the pendulums motion, and then read part of You Wouldn't Want to Live Without Gravity. Then, we did a couple other tests involving gravity, first by dropping a weighted sock from different heights onto a scale so we could see the differences in force. And, finally, we played with paper airplanes and air foils, trying to create something that could take advantage of the lift caused by the air to conteract gravity. Additional ActivitiesArticles & Books & More:
All Work and No Play An article that explains what work means in physics. We will be moving on to this topic next week, so please prepare by reading and/or watching something that discusses work. Brains On: The Mystery of Gravity This podcast is a favorite at our house. Check out the show they did on gravity, or browse their other episodes to find more topics that interest you. Videos: Sand Pendulum Make your own sand pendulum. This also discusses some of the motions you can see. Pendulum Wave Demonstration This is a great visual of the relationship between pendulum length and period! Definitely worth the 3 minutes to watch. Energy, Work, and Power Quick explanation for how these 3 concepts are related. Will help explain what we will be doing next in class.
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May 2020
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