GCSE Physics

More Perpetual Motion

On the surface of the Earth, to start a body moving, we must first overcome the Earth's gravitational field and the force of friction or drag. Anchored to the ground, only relatively large forces bring an object into motion.

But in the vacuum of space, to bring a body into motion, we need not overcome the Earth's gravitational field or the force of friction or drag. Suspended in space, even very slight forces bring an object into motion.


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