Luke Edition Compulsory Two Chapter 2 "Energy Transformation and Conservation" ppt (two methods can be used for combining external forces to do work: one is to find the combined external forces first, and then to calculate according to the formula W = F combined · S · cosα; Find the work of each external force, and then find the algebraic sum of the work of each external force.) (1) The work done by gravity on an object is only related to the position of the starting point and the end point, but not to the path of the object's movement. (2) Gravity does positive work on the object, the gravity potential energy of the object decreases, and the reduced gravity potential energy is equal to the work done by gravity; gravity does negative work (the object does work against gravity), the gravity potential energy increases, and the increased gravity potential energy equals to overcome gravity The work done.
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