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ENERGY

ENERGY. Energy the ability to do work. E  F  W Work= Force x Distance (W=F x D) Work is done- same direction of F & D ex: throwing a ball, pushing/pulling a chair No work is done - different direction of F & D and if no displacement/distance

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ENERGY

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  1. ENERGY

  2. Energy • the ability to do work.E  F  W • Work= Force x Distance (W=F x D) • Work is done- same direction of F & D ex: throwing a ball, pushing/pulling a chair • No work is done- different direction of F & D and if no displacement/distance ex: pushing a tree *Unit of measurement--- J Joules (N x m)

  3. KINDS OF ENERGY: • Kinetic Energy (KE) -is energy in motion -E of moving object) ex: flowing water, flying bat • Potential Energy (PE) -is energy at rest (due to its position) -stored energy -E of stationary/not moving objects ex: water in a glass, chicken adobo

  4. Forms of Energy: 1. Chemical Energy (CE) 2. Mechanical Energy (ME) 3. Electrical Energy (EE) 4. Sound Energy (SE) 5. Heat Energy (HE) 6. Radiant Energy (RE) a. Solar E (UV Rays/Sunlight) b. Light E (visible light) c. Infrared Rays d. X-rays e. Radiation 7. Nuclear Energy (NE)

  5. Law of Conservation of Energy “Energy is neither created nor destroyed, it is only changed from one form to another.” • Energy Transformation • Sun – main source of energy Ex: washing machine ( EE to ME) barking dog (CE to SE) Television (EE to LE,HE,SE) flash light (CE to LE,HE)

  6. Sources of Energy: 1. Renewable (unlimited) - sources that can be replaced within a short time after we use them a. Solar (sun) b. Water c. Tide (waves) d. Geothermal Energy (steam/vapor) e. Wind

  7. 2. Non-renewable (limited) -- sources that we are using faster than they can replaced a. fossil fuels (remains of plants and animals) - petroleum products –diesel, gasoline, kerosene, LPG, paraffin, grease - coal - natural gas (methane) b. biofuel/biomass –from living things - trees, sugarcane(alcogas),bacteria

  8. Methods of Heat Transfer • Heat energy or thermal energy is the energy present due to the motion of itsmolecules. • Heat always transfers, travels, or flows from a high temperature to a low temperature(hot to cold). 1.Conduction– is the transfer of heat between substances that are in direct contact with each other. • The better the conductor, the more rapidly heat will transfer. • Metals are good conductors of heat. • Solids (fastest) Liquid (faster) Gas (fast)

  9. 2.Convection – is the up and down movement of gases and liquids caused by heat transfer. (sinking of dense ,cold gas/liquid and rising of less dense, hot gas/liquid). 3.Radiation – is a method of heat transfer in which energy is transmitted by waves through space. (no direct contact) • When the radiant energy strikes a body where it is absorbed, the body becomes hot. • The three methods of heat transfer can be observed when boiling water in a beaker.

  10. Heat allows us to do work (cook food, etc.); causes phase change; causes expansion and contraction; and causes chemical change (combustion/burning).

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