Textbook Guide Physics: Elastic Energy, Conservative Force, Gravitational Energy
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PHY131H1 Full Course Notes
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In a situation in which w1=-w2 is always true, the other type of energy is a potential energy and the force is said to be a conservative force. The gravitational force and the spring force are both conservative: a force that is not conservative is called a nonconservative force. The kinetic frictional force and drag force are nonconservative. Determining potential energy values: gravitational potential energy. The gravitational potential energy associated with a particle earth system depends only on the vertical position y (or height) of the particle relative to the reference position y = 0, not on the horizontal position. U(y) = mgy: elastic potential energy. The mechanical energy emec of a system is the sum of its potential energy u and the kinetic energy k of the objects within it: emec = k + u (mechanical energy) The relationship between force and potential energy: