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Published byRodger Daniel Modified over 9 years ago
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NM Unit 6 Topic: Work and Energy Learning Goals: Identify the types of energy that make up the total energy of a system Predict changes in mechanical energy when positive or negative work is done on the center of mass Analyze a system and categorize the internal energy as potential, kinetic, or some combination of potential and kinetic. Solve problems involving work, power, and/or energy Solve problems involving the Work-Energy Theorem
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Work and Energy Both scalar quantities Both have units of Joules Oh, and there is this weird equation thing...
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Work changes energy? What kind of energy (or energies) do we have? Specifically how can work change that type of energy?
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Work and Kinetic Energy A 9kg bag is being pushed from rest 5m across a smooth floor with a force of 11N. After being pushed 5m the bag has a velocity of 3.5 m/s (a) Calculate the work done on the bag (b) Calculate the change in kinetic energy
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Work and Potential Energy A factory worker lowers a 15kg crate from a shelf 1.78 m above the ground to the ground. The crate is being lowered at a constant velocity. (a) What is the work done on the crate by the worker? (b) What is the change in gravitational potential energy of the crate?
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Power and Energy/Work Revisit Power is the rate at which work is done or energy is converted. Watts are J/s The wattage of something is the “conversion rate”. A 60W lightbulb converts 60J/s of electrical energy into heat and light.
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