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GCSE Physics - Resultant Forces

When a moving object has a net resultant force of 0 the object will travel at a constant speed. In a vacuum when an object is moving at a constant speed why is there always an equal resultant force acting in the opposite direction? There is no air resistance to act in the opposite direction. What forces act on the object as it moves at a constant speed?
(edited 7 months ago)
Reply 1
Have you got an example?

E.g. the moon has a fairly strong gravitational field but no atmosphere, objects dropped on the moon will just accelerate due to gravity at a constant rate until they collide with something... never reaching a terminal velocity.


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