PHYA11H3 Chapter 10: Chapter 10 Energy
12 Dec 2016
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Total energy of a system: the sum of the various forms of energy: is not changed between the transformation between the different forms of energy. Energy can also be transferred from one system to another. Work: the mechanical transfer of energy to a system via forces. Conservation law for free-fall motion: the quantity vy. 2 + 2gy has the same value after free fall (regardless of whether the motion is upward or downward) that it had before free fall. Newton"s second law for one dimensional motion along the y-axis vfy. Kinetic energy: an energy of motion, 1 kg m2/s2 = 1 joule (j: depends on the object"s speed but not its location. Gravitational potential energy: an energy of position, 1 kg m2/s2 = 1 joule (j: depends on the object"s position but not its speed. The sum of kinetic energy and gravitational potential energy is not changed by free fall. Energy is a scalar, not a vector.
