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PowerPoint Notes

Student Notes

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Energy is the ABILITY TO DO WORK. There are 2 different Types of Energy. Potential Energy is any form of stored energy. Gravity Springs Kinetic Energy is energy in motion. Falling Apple Moving Vehicle There are 3 different Categories of Energy. Exhaustible / Non-renewable Renewable Inexhaustible Examples of Nonrenewable Energy: Petroleum Based Fuels Nuclear Energy Renewable Energy is sometimes called Bio-conversion. Examples of Renewable Energy: Human Energy Wood Alcohol / Methanol / Bio-diesel Trash? Examples of Inexhaustible Energy: Wind Hydro / Wave Solar Geo-Thermal Cold Water? 6 Forms of Energy & Their Uses Thermal Manufacturing Chemical Batteries / Food Mechanical Motion Radiant Solar Heat Electrical Movement of electrons Nuclear Fission / Fusion Law of Conservation of Energy - Energy cannot be created nor destroyed, however it can be converted from one form to another. Second Law of Thermodynamics - No energy system can be a 100% efficient. Energy Measurements Joule BTU Calorie Work Work is the application of force that moves an object a certain distance. Work can be calculated through the following equation: Work = Force Applied x Distance Power Power is the amount of work being done over a period of time. It is a measure of how quickly work is/can be done. Energy is useful ONLY when it is converted into power. Power = Force x Rate 3 Components of Power Control Transmission Storage To use power effectively, we must be able to control it. Controlling power enables one to start, stop, or change direction. Energy Transmission - Movement of energy within or into another energy system. Mechanical Advantage is an increase in force provided by a machine. Simple Machines Lever Pulley Gear Incline Plane Wheel and Axle Fluid Power Hydraulics Systems are those that control and transmit energy through liquids. Pneumatic Systems are those that control and transmit energy through gases. Newton’s Laws of Motion Newton's First Law: A body of mass in a state of rest tends to remain at rest and a body or mass in motion tends to remain in motion, unless acted upon by another force. Newton's Second Law: An unbalance of force on a body tends to produce an acceleration in the direction of the force. Newton's Third Law: For every acting force there is an equal and opposite reacting force.

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