The law of inertia, also known as Newton's first law of motion,
basically says that an object will continue doing what it is already doing,
unless an external force is applied to the
object.
What this means, simply, is that once you start moving, you
should continue moving at the same rate forever. However, even on a level surface you are
encountering several types of forces that try to slow your bike down. These include wind, air
resistance, friction within the wheels of the bike, and probably most important, the friction
between the bike tires and the road. So you must continue to apply enough force to equal the
various friction forces acting on your bike so that you move at a constant speed. If you stop
pedaling you will slow down, and if you pedal faster you can accelerate. All according to
Newton's first law of motion.
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