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The terms in bold link to topics in the AQA, Edexcel, OCR, WJEC and CCEA A-level specifications, as well as the IB, Pre-U and SQA exam specifications.
The motion of a single object can be described using Newton’s laws. Orbits are often modelled as if the object being orbited has infinite mass, using the mathematics of circular motion. In a more sophisticated model both objects orbit a common centre of mass. This leads to new insights into angular momentum, and observable effects in astrophysics and atomic physics.
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