... y multiplying the weight of the bag by the height that the bag is lifted up to. In letters: Ep = (W) * H, or (M * G) * H (M) W (weight, N) is the same as M (mass, Kg) * G (gravitational pull, N/Kg) When we apply this formula to the situation with the schoolbags, and use average numbers for weight of school bag and height of student, this formula is obtained: Ep = M * G * H = 7.5(Kg) * 9.81 * 1.60(M) = 73.575 * 1.60 = 117.72 = 118 (J) to 3 S.F. (significant figures) The potential energy is equal to the work done because instead of multiplying the weight (or force) by the height, it is multiplied by the distance. Work: W = F * D (or height) W/Ep = F * H (or distance) There are also different forms of energy in this simple and short (series of) ...

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