Energy and Work.

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Presentation transcript:

Energy and Work

What does the word “energy” mean to you? Energy is ___________________________________ ___________________________________________ ___________________________________________ ___________________________________________

Energy Storage and Transfer Mechanical energy Kinetic energy (____) – ______________________________ Example – __________________________________ Potential energy (____) – ____________________________ __________________________________________________ Elastic potential energy (____) – ______________________ __________________________________________________

Energy Storage and Transfer Electrical energy Energy stored in an _______________ (used to make __________________ – ___________________________) Example – __________________________________ Chemical potential energy _______________________________________________ Sound energy

Energy Storage and Transfer Light energy ____________________ Example – __________________________________ Nuclear energy ____________________________________________________________________________________________________ Thermal energy __________________________________________________

Kinetic energy Energy associated with _________________ Note that the energy is based on the ________ of an object ______________ _________ the energy does not mean that the object has ________ of the speed it used to have _______________ the speed makes the energy increase by a factor of _______!

Calculating Kinetic Energy What is the kinetic energy of a 100 kg person running at 4 m/s?

Gravitational potential energy Energy stored by the _______________________ __________________________ Measure of how much energy ___________________ ____________________________ Depends on ______________________, ___________ ______________________, and___________________

Gravitational potential energy

Calculating EG What is the gravitational potential energy of a 2 kg book that is sitting on a shelf 2.5 meters above the floor?

Energy conversion in a system Energy can be _____________________ form within a system Energy flows ________________________ within a system What is a “system?” ___________________ ____________________________________ Example - pendulum swinging The system is __________________________

Energy Conversion

Energy Conversion

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