ENERGY The SI unit of energy is the Joule.

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Presentation transcript:

ENERGY The SI unit of energy is the Joule. the ability (capacity) to do work The SI unit of energy is the Joule. Energy, like work, is a scalar quantity.

FORMS OF ENERGY MECHANICAL - energy relating to moving objects HEAT- energy related to the vibration of the particles that make up an object CHEMICAL - energy related to the bonds that hold particles together ELECTROMAGNETIC - energy related to moving electrical charges NUCLEAR - energy related to the decay of the nucleus of atoms

KINETIC ENERGY – energy of motion KE = 1/2 mv2 KE - the kinetic energy in J m - mass of the object in kg v - speed of the object in m/s

WORK –ENERGY THEOREM The net work done on an object is equal to its change in kinetic energy

GRAVITATIONAL POTENTIAL ENERGY – energy of position PE = mgh PE - the potential energy in J m - mass of the object in kg g – acceleration due to gravity (9.8 m/s2) h - height of the object in m

LAW OF CONSERVATION OF ENERGY Energy can neither be created nor be destroyed; it can only be transformed The sum of all types of energy before the event is equal to all types of energy after the event

LAW OF CONSERVATION OF ENERGY A cyclist slows down as it approaches the summit of the mountain (High PE-Low KE) and speeds up as he descends from the mountain (Low PE-High KE)

POWER - rate at which work is being done POWER (Watt) = WORK (Joule) TIME (Second) 1 HP = 550 foot-lbs/sec = 745.7 watts