Why is less force needed to keep an object moving than to start the object in motion?

An object in motion needs less force to continue moving because the inertia or the resistance to change in motion was already overcome and the sliding friction that opposes a moving object is also lesser. Therefore, it is easier to move an object at constant velocity as you only need to overcome the resisting forces of the object.

only about ten percent of the energy at one trophic level is passed on to organisms at the next trophic level. the remainder of the energy is used in life processes or lost as heat.