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Potential and Kinetic Energy Potential and Kinetic Energy

How is all energy divided? All Energy Potential Energy Gravitation Potential Energy Elastic Potential How is all energy divided? All Energy Potential Energy Gravitation Potential Energy Elastic Potential Energy Kinetic Energy Chemical Potential Energy

What is Potential Energy? o Energy that is stored and waiting to be used What is Potential Energy? o Energy that is stored and waiting to be used later

What is Gravitational Potential Energy? o Potential energy due to an object’s position Don’t What is Gravitational Potential Energy? o Potential energy due to an object’s position Don’t look down, Rover! Good boy! o P. E. = mass x height x gravity

What is Elastic Potential Energy? o Potential energy due compression or expansion of an What is Elastic Potential Energy? o Potential energy due compression or expansion of an elastic object. Notice the ball compressing and expanding

What is Chemical Potential Energy? o Potential energy stored within the chemical bonds of What is Chemical Potential Energy? o Potential energy stored within the chemical bonds of an object

What is Kinetic Energy? o Energy an object has due to its motion o What is Kinetic Energy? o Energy an object has due to its motion o K. E. =. 5(mass x speed 2)

TYPES OF ENERGY Mechanical, Electromagnetic, Electrical, Chemical and Thermal TYPES OF ENERGY Mechanical, Electromagnetic, Electrical, Chemical and Thermal

What is Mechanical Energy? o Energy due to a object’s motion (kinetic) or position What is Mechanical Energy? o Energy due to a object’s motion (kinetic) or position (potential). The bowling ball has mechanical energy. When the ball strikes the pins, mechanical energy is transferred to the pins!

Examples of Mechanical Energy Examples of Mechanical Energy

What is Electromagnetic Energy? o Light energy o Includes energy from gamma rays, xrays, What is Electromagnetic Energy? o Light energy o Includes energy from gamma rays, xrays, ultraviolet rays, visible light, infrared rays, microwave and radio bands

What is Electrical Energy? o Energy caused by the movement of electrons o Easily What is Electrical Energy? o Energy caused by the movement of electrons o Easily transported through power lines and converted into other forms of energy

What is Chemical Energy? o Energy that is available for release from chemical reactions. What is Chemical Energy? o Energy that is available for release from chemical reactions. The chemical bonds in a matchstick store energy that is transformed into thermal energy when the match is struck.

Examples of Chemical Energy Examples of Chemical Energy

What is Thermal Energy? o Heat energy o The heat energy of an object What is Thermal Energy? o Heat energy o The heat energy of an object determines how active its atoms are. A hot object is one whose atoms and molecules are excited and show rapid movement. A cooler object's molecules and atoms will show less movement.

QUIZ TIME! What type of energy cooks food in a microwave oven? ELECTROMAGNETIC ENERGY QUIZ TIME! What type of energy cooks food in a microwave oven? ELECTROMAGNETIC ENERGY What type of energy is the spinning plate inside of a microwave oven? MECHANICAL ENERGY

QUIZ TIME! Electrical energy is transported to your house through power lines. When you QUIZ TIME! Electrical energy is transported to your house through power lines. When you plug an electric fan to a power outlet, electrical energy is transform into what type of energy? MECHANICAL ENERGY

QUIZ TIME! What energy transformation occurs when an electric lamp is turned on? ELECTRICAL QUIZ TIME! What energy transformation occurs when an electric lamp is turned on? ELECTRICAL ENERGY ELECTROMAGNETIC ENERGY

What types of energy are shown below? Mechanical and Thermal Energy (Don’t forget friction) What types of energy are shown below? Mechanical and Thermal Energy (Don’t forget friction)

What type of energy is shown below? Chemical Energy What type of energy is shown below? Chemical Energy

What types of energy are shown below? Electrical, Mechanical and Electromagnetic Energy What types of energy are shown below? Electrical, Mechanical and Electromagnetic Energy

What type of energy is shown below? Chemical Energy (yummy) What type of energy is shown below? Chemical Energy (yummy)

What type of energy is shown below? Thermal Energy What type of energy is shown below? Thermal Energy

Heat Transfer Conduction, Convection and Radiation Heat Transfer Conduction, Convection and Radiation

What is Conduction? • Conduction – heat transferred by particles colliding into one another, What is Conduction? • Conduction – heat transferred by particles colliding into one another, such as in a metal. • Transfer of energy by touch • Not an effective transfer in a gas. • Primarily solids

Conduction Conduction

What is Convection? • Convection – heat transferred by the circulation of a fluid What is Convection? • Convection – heat transferred by the circulation of a fluid (or gas), such as in a heating system at home; important near the surface of the Sun. • Hot air rises cool air falls

Convection Convection

What is Radiation? • Radiation – heat transferred by the flow of electromagnetic radiation, What is Radiation? • Radiation – heat transferred by the flow of electromagnetic radiation, like heat felt from the campfire. • Radiation is the only type of heat transfer that can happen in a vacuum. • Heat transfer through waves

Radiation Radiation

Heat Transfer Sum It Up • CONDUCTION: the transfer of energy through matter by Heat Transfer Sum It Up • CONDUCTION: the transfer of energy through matter by direct contact of particles. This can happen in solids, liquids and gases. • CONVECTION: the transfer of energy because of the movement of bulk masses of particles. This can happen only in liquids and gases not in solids. • RADIATION: the transfer of energy by electromagnetic waves. Energy can move by radiation in air like the heat from your electric stove top, or in the vacuum of space the way the Sun heats the Earth. In radiation, the energy does not have to transfer through mass (particles).

Conduction, Convection, or Radiation? Walking on Hot Coals Conduction, Convection, or Radiation? Walking on Hot Coals