Energy and Work2.ppt

8/10/2019 Energy and Work2.ppt

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Types of Energy Forms of Energy

Law of Conservationof Energy

Amusement ParkPhysics and Activities

Work

Renewable andNonrenewable Sources


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Renewable NonrenewableMain Menu


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Kinetic Energy Potential Energy

Main Menu


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Radiant ElectricalChemical

Thermal Nuclear

Magnetic

Sound

Mechanical

Main Menu


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Radiant energy is also called electromagnetic energy. Radiant energy isthe movement of photons. All life on earth is dependent on radiant energyfrom the sun. Examples of radiant energy include radio waves (AM, FM,TV), microwaves, X-rays, and plant growth. Active solar energy uses

photovoltaic panels and light to turn radiant energy into chemical energy.

Forms ofEner


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Chemical energy is the energy stored inthe bonds of atoms and molecules. This aform of potential energy until the bondsare broken. Fossil fuels and biomass storechemical energy. Products that containchemical energy include: TNT, bakingsoda, and a match. Biomass, petroleum,natural gas, propane and coal areexamples of stored chemical energy.

Forms ofEner


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Electrical energy is the movementof elections. Lightning and staticelectricity are examples ofelectrical energy that occurnaturally. Science hasn't found away to use natural forms ofelectrical energy, like lightning.Instead, we use different energysources to create electrical energy

by using generators and turbines.

Forms ofEner


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Nuclear energy is the energystored in the nucleus of an atom. Nuclear energy is unusual in thatit can give off energy in the formof light or heat, but it is thechange in the atom's makeup that

produces the energy. Submarines, power plants, and smoke detectorsall use nuclear energy. Nuclear

power plants use uranium, aradioactive element, to createelectricity.

Forms ofEner


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Thermal energy is the internal energyin substances-the vibration andmovement of atoms and moleculeswithin substance. Thermal energy iscreated in the movement of atoms.Boiling water, burning wood, andrubbing your hands together really fastare all examples of heat energy.Geothermal and passive solar are

sources of heat energy, but biomass (atype of chemical energy) can be burnedto produce heat energy.

Forms ofEner


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Sound energy is the movementmolecules in the air that producesvibrations. Alarms, music, speech,ultrasound medical equipment all

use sound energy. VCR tapeschange sound energy into electricalenergy. The electrical energyrecords the sound using magnetictape. Speakers read the magnetictape and change it back into sound.

Forms ofEner


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Mechanical energy is the movementof machine parts. Mechanical energyis also the total amount of kinetic and

potential energy in a system. Wind-up toys, grandfather clocks, and pogosticks are examples of mechanicalenergy. Wind power uses mechanicalenergy to help create electricity.

Potential energy + Kinetic energy = Next


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Potential energy + Kinetic energy = Mechanical energy

Forms ofEner

Example of energychanges in a swingor pendulum.


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Magnetic energy is the attraction ofobjects made of iron. Medicalequipment, compass, refrigeratormagnets are all examples of

magnetic energy. Any type ofenergy source that uses a generatorin the process to make electricityuses magnetic energy.

Forms ofEner


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Kinetic energy exists whenever an object which has mass is in motionwith some velocity. Everything you see moving about has kineticenergy. The kinetic energy of an object in this case is given by therelation:

KE = (1/2)mv2

m=mass of the object

V=velocity of the object

The greater the mass or velocity of a moving object, the more kineticenergy it has.

Kinetic Energy Lab

Next
http://www.jersey.uoregon.edu/vlab/KineticEnergy/http://jersey.uoregon.edu/vlab/Potential%20Energy/http://www.jersey.uoregon.edu/vlab/KineticEnergy/http://jersey.uoregon.edu/vlab/Potential%20Energy/


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The greater the mass or velocity of a moving object, the more kineticenergy it has.

Kinetic Energy Lab Types ofEnergy
http://www.jersey.uoregon.edu/vlab/KineticEnergy/http://jersey.uoregon.edu/vlab/Potential%20Energy/http://www.jersey.uoregon.edu/vlab/KineticEnergy/http://jersey.uoregon.edu/vlab/Potential%20Energy/


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Law of Conservation of Energy- Energy can neither becreated nor destroyed. Energy is always changing fromone kind to another. The total energy of an object neverchanges.

Potential energy + Kinetic energy = Total energy andTotal energy Kinetic energy = Potential energy andTotal energy - Potential energy = Kinetic energy

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Work is the transfer of energy through motion. In order forwork to take place, a force must be exerted through a distance.The amount of work done depends on two things: the amountof force exerted and the distance over which the force isapplied. There are two factors to keep in mind when decidingwhen work is being done: something has to move and themotion must be in the direction of the applied force. Work can

be calculated by using the following formula: Work=force x

distance


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Main MenuMain Menu

Work is done on the

books when they are being lifted, but no workis done on them whenthey are being held or

carried horizontally.


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Energy and Work2.ppt