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Swinging force for dummies

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Units serve as guides to a particular content or subject area. Nested under units are lessons in purple and hands-on activities in blue. Note that not all lessons and activities will exist under a unit, and instead may exist as "standalone" curriculum. How do pendulums work?
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Trig and forces: the pendulum

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Swinging: Measuring forces with oscillations -- ScienceDaily

Introduction Did you know that playground swings can provide a good lesson in physics—as well as lots of fun? The back-and-forth motion of a swing is an example of a pendulum. We see pendulums in other areas of our lives as well, such as in grandfather also known as longcase clocks. But pendulums can do more than provide fun at recess and help tell the time—among other scientific applications, they can show that the earth is huge! This is because the swinging motion of a pendulum is due to the force of gravity generated by the earth's size. Other factors, including a pendulum's length, can also affect its motion.
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Swinging with a Pendulum

Most people enjoy going to playgrounds and playing on the swings. Understanding their movement has helped people tell time, keep the beat or rhythm in music, and protect buildings against Earthquakes. Do you know what causes a swing to move back and forth if you only raise it and release it?
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Occasionally there are physics lab demonstrations that I think are pretty awesome but that my students just think are "meh. The basic idea in this demo, which I used in my class at Southeastern Louisiana University, is to swing a mass around in a horizontal circle. But wait! There's a cooler part: By running the string through a vertical tube and attaching it to another mass, we can control the tension in the string.
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