- Количество слайдов: 33
Potential and Kinetic Energy
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 later
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 elastic object. Notice the ball compressing and expanding
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 K. E. =. 5(mass x speed 2)
TYPES OF ENERGY Mechanical, Electromagnetic, Electrical, Chemical and Thermal
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
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 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. The chemical bonds in a matchstick store energy that is transformed into thermal energy when the match is struck.
Examples of Chemical Energy
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 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 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 ENERGY ELECTROMAGNETIC ENERGY
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 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? Thermal Energy
Heat Transfer Conduction, Convection and Radiation
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
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
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
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