i was just wondering about the relationship between force and acceleration. from what i have learned in school and at university is that when a force is applied to an object, the object is accelerated. But what i am a bit confused about is why objects accelerate. this is what i think but am not sure if it is right. it takes a certain amount of force to start an object moving, but as soon as the object starts moving the force required to keep it moving is less than the force to get to start moving in the first place. so if the initial force is keep constant then there will be acceleration? but eventually the friction from air resistance or whatever will eventually work against the acceleration and acceleration will be zero. is this right?