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Transcript
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 How Much Potential Energy? Depends on height above the Earth and weight. The higher it is, the more PE it has The heavier it is, the more PE it has What is Elastic Potential Energy? o Potential energy due to 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 speed2) How Much Kinetic Energy? Increasing the speed and/or mass of an object increases the kinetic energy. Mechanical Energy Energy possessed by an object due to its motion or position (the objects combined potential and kinetic energy) ME=PE+KE Law of Conservation of Energy No matter how energy is transferred or transformed, all of the energy is still present somewhere in one form or another. Skateboard Ramp Top of skateboard ramp is 100% PE because gravity can pull him down but there is no velocity so no KE Going down the ramp PE is decreasing because elevation is decreasing but KE is increasing because velocity increases 50/50 Bottom of ramp KE is 100% because gravity cannot pull him down more Examples When on a rollercoaster, when do you have the maximum PE? KE? When you climb a waterslide, what type of energy are you gaining? A lump of coal and a can of gasoline are examples of what type of energy? More Examples Which is an example of the conversion of PE to KE? a. Catching a baseball b. Recharging your cell phone battery c. Stretching a rubber band d. Coasting downhill on your bicycle
