There are two objects, lets go with the classic cannon ball and football. These objects are both equal in size and shape but they obviously have different masses (the cannon ball being heavier). My question is, will these two objects fall and hit the ground at the same time if dropped from the same height on Earth and if their is drag (air resistance) acting upon them? Some people that I have discussed this with say that momentum would make a difference and one would accelerate faster, whilst others say that the cannon ball would have more drag and so would travel at a slower speed but I have now become so lost in what to believe. I went back to basics and looked at this video: http://www.bbc.co.uk/learningzone/clips/gravity-momentum-and-air-resistance-on-falling-objects/10897.html but I thought that they should have hit the ground at the same time or was the result of that experiment just human error and the bottles needed to be falling at the same angle? Can someone please explain to me where I have gone wrong?