Work and Energy Pre-class study material Slide show mode recommended.

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Presentation transcript:

Work and Energy Pre-class study material Slide show mode recommended

Energy and Work 2 Energy: the ability to do work – money in bank accounts Work: energy transferred to or from an object by means of a force acting on the object – money transferred between accounts

Types of Energy 3 Mechanical Electrical Electromagnetic Chemical Nuclear Thermal

Types of Energy - Mechanical 4 h v Kinetic energy - Energy of a moving object Gravitational protential energy - Energy an object contains due to its position Derivation of energy equation will be discussed in class

Types of Energy - Mechanical 5 Elastic potential energy - Energy stored in an object that is being stretched, squashed, twisted, you name it! Kinetic energy - Energy of a moving object Gravitational protential energy - Energy an object contains due to its position Derivation of energy equation will be discussed in class

Types of Energy - Mechanical 6 Elastic potential energy - Energy stored in an object that is being stretched, squashed, twisted, you name it! Kinetic energy - Energy of a moving object Gravitational protential energy - Energy an object contains due to its position Sound energy - Associated with the potential and kinetic energy of air molecules What can you hear in vacuum? “Shimmering air”

Types of Energy Electrical energy -Supplied by the combination of electric current and electrical potential that is delivered by the circuit -Caused by movement of electrons 7

Types of Energy Electromagnetic energy -Energy emitted and absorbed by charged particles which exhibits wave-like behavior as they travel through space -Radio bands -Microwave -Infrared -Visible light -Ultraviolet -X-rays -Gamma rays 8 Light energy

Types of Energy Chemical energy -Potential of a chemical substance to undergo a transformation through a chemical reaction -Breaking or making of chemical bonds 9 Nuclear energy -Energy released when the nuclei of atoms are split or fused shale rocks containing oil sugar

10 Types of Energy Thermal energy -Energy of a substance or system related to its temperature, i.e., the energy of moving or vibrating molecules What’s the relationship between thermal energy and heat?

11 Work and Energy Conversion Doing work = Transferring energy –The transfer of energy sometimes accompanies the conversion between different types of energy  I lift a heavy box: I apply force to increase the gravitational potential energy of the box  The tungsten bulb lights up: electrical energy heats up the filament, i.e. increase thermal energy, which converts to electromagnetic energy (light)  Name some work and energy conversion you see in daily life  Relationship between thermal energy and heat: heat is the energy transferred from one body to another by thermal interactions

12 Work and Energy Are you ready for a 3-minute quiz? See you in class!

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