Reference Frame | Describing Motion
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Reference Frame | Describing Motion

Reference Frame of Describing Motion A reference frame is how we define what is “stationary.” We define the frame of reference as stationary. All positions of measurement are made from a frame of reference. The most common reference frame is the Earth. Trains and speed Trains are useful for thinking about reference frames. If we...

Earth’s Gravitational Field
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Earth’s Gravitational Field

Earth’s Gravitational Field People have always known that free objects drop to the ground, but it was not until the early seventeenth century that philosophers started to formulate theories as to why this happened. Galileo was intrigued by gravity. People of his day thought that heavier objects fell more quickly than lighter objects, and that...