MATH116 Lecture Notes - Lecture 14: Gravitational Potential, Net Force
9 Dec 2015
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Friday, december 4 lecture 36 : applications : work and energy (refers to section 7. 4 in your text) Expectations : compute the work performed while moving objects over given distances. 36. 1 work performed by a constant force on a mass over a distance d. suppose a constant force f is exerted on an object producing a constant acceleration a over a distance d. Recall newton"s second law of motion: it states that f = ma. We will suppose that f is a net force in the sense that any force opposing the movement is already taken into account inside f. The force will give to the mass m kinetic energy, k = (1/2)mv2. The energy provided to the mass m by this force is then where kf is the final kinetic energy and ki is the kinetic energy already possessed by the mass when this net force starts acting on it.
