Teaching Videos
Why Does The Earth Spin?
markwarner » 10am - Dec 9, 2011
The Earth spins on its axis, completing a full revolution every day....
Rating: 2.6 (17 Votes)
Category: Space
Tags: science, space, forces, physics, inertia, German friendship globe, spin, spinning, science literacy, mass, Newtons Laws, keystage2, keystage3
The Earth spins on its axis, completing a full revolution every day. By why does it do this? One of the most common misconceptions in physics is the belief that constant motion requires a constant force. So many people believe there must be some force in the Earth (e.g. gravity, centrifugal force) that keeps it spinning. In truth, no force is required because a fundamental property of mass is that it maintains its state of motion in the absence of external forces. This property is called inertia.
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