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Force IS defined as the first derivative of Energy, F = dW/dr.
It depends on the density on the item. The density of water is 1.0 so if the density of the item is lower then that it will float, if the density is greater then that, then the item will sink.
any item that can be traded for another item
A weighing machine will give you the mass of an item. The weight of an item is the amount of force that an item exerts on the earths surface.
A name of a measuring item used in science is MEASURING CUP
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