ocr: Getting things moving To start an object moving over the surface of another one, you have to push with enough force to overcolle the triction between the surfaces of the tWo objects. The amount of - force you need to apply to an object to make it move. depends on: what its made of its weight the smoothness of its surface the surface that its resting on However, you can't move an object more easily by making its surface area smaller. A rolled up rug, for instance, is no easier to slide over a floor than when its flat. This is partly because the rugs weight is the same whether its rolled up or n ...
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