Why do you push harder on the pedals of the bicycle when first starting out than when moving at constant speed?
Basically, as a body accelerates, the forces acting upon it are unbalanced. However, as one reaches uniform speed (constant speed) you are no longer accelerating, so the force…s acting upon the bike are now balanced. Newton's second law of motion states that when something is moving, it will continue to move at the same velocity until another force is applied (inertia). Because of this, the bike will be moving "on its own" after you stop peddling, so there is less need to pedal. (MORE)