A big box of mass (M) is sitting on a scale. From the ceiling of the box hangs a load of bricks of mass (m). The scale reads a total weight (W). The rope from which the bricks are hanging snaps, and the bricks start falling down inside the box. As the bricks fall down, but before they hit the bottom, will the weight shown by the scale be larger than, smaller than, or equal to the weight (W)?

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Electric Charges and Fields

One of the fundamental properties is the electromagnetic property. Charge cannot be destroyed by any process and this contributes formally to the law of charge conservation.