I have just returned from a holiday in turkey, and the resort we stayed at had a water slide that ran into the pool. When sunbathing, I noticed that any children who attempted the water slide seemed to descend at at a slower rate than when a larger/fatter adult tried it. Now, I am firm in my belief that all objects accelerate to the earth at the same rate due to gravity, and that it is gravitational attraction that causes both the child and the larger adults to whiz down the slide into the pool below. So what is happening? Why do people with bigger masses fall quicker down the slide than people with smaller masses? Is it to do with frictional forces and surface areas? Or is it an illusion, where in fact people of all masses go down the water slide at the same speed?