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Energy - PowerPoint PPT Presentation

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Energy. Energy. The ability to do work. Work : a transfer of energy. Both energy and work are measured in Joules J Energy and work are related. When work is done on an object energy is being transferred to the object. Law of Conservation of Energy.

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Presentation Transcript
  • The ability to do work.
  • Work : a transfer of energy.
  • Both energy and work are measured in Joules J
  • Energy and work are related. When work is done on an object energy is being transferred to the object.
law of conservation of energy
Law of Conservation of Energy
  • Energy can not be created nor destroyed only changed to a new form.
  • Basically means in a closed system that amount of energy going in will equal the amount of energy coming out.
  • In some situations energy may be lost due to friction forces and changed to heat.
energy conversions
Energy Conversions
  • Energy can be converted from one form to another. Conversions are constantly occurring.
types of energy
Types of Energy
  • There are many forms of energy either renewable or non-renewable.
types of energy1
Types of Energy
  • 1. Mechanical (kinetic or Potential)
  • 2. Thermal/Heat
  • 3. Chemical
  • 4.Electromagnetic
  • 5. Nuclear
  • 6. Electrical
mechanical energy
Mechanical Energy
  • Energy associated from motion and position of everyday objects.
  • ME = KE + PE
kinetic energy
Kinetic Energy
  • Energy of motion.
  • KE = ½ MV²
  • Doubling mass = doubling KE
  • Doubling velocity = quadrupling KE
potential energy
Potential Energy
  • Energy stored as position, shape, or condition.
  • Cello bow & arrow food fuel glycogen
  • Two types:
  • 1. gravitational potential energy: based on height & mass

GPE = mgh

m: mass g: acceleration due gravity h: height

m : kg

g = 9.8 m/s² Earth

ht : m

To convert from mass to weight multiply by 9.8

Mass x 9.8 = Weight (N)


2. elastic: based on condition/elasticity.

  • The potential energy of an object that is stretched or compressed.
  • Can spring back to its original shape after being compressed or stretched.
  • Some of our first clocks relied on pendulums that swung to keep time. It converted pe to ke.
  • Pole vaults, roller coasters, skiing
thermal energy
Thermal Energy

When atoms move faster the Thermal Energy will increase and the object will become warmer.

t h e rmal e nergy
Thermal Energy
  • Total P.E. + K.E.
  • depends on mass and temperature
  • Teapot vs. cup = teapot has more due to mass of particles
  • Hot tea vs. Cold tea = hot has more due to more K.E.
hea t 4t s
Heat (4T’s)
  • Transfer of Thermal Energy from one object to another because of temperature differences.
  • Always moves from Hot to Cold
t e mp e ratur e 4e s
Temperature (4E’s)
  • How hot or cold an object is
  • Related to the average K.E. of particles in an object
  • Due to their random motion
specific heat
Specific Heat
  • The amount of heat required in calories to raise the temperature of 1 g. by 1ͦͦ c
specific heat1
Specific Heat
  • Like iron, most substances have a specific heat lower than that of water, meaning that less heat is needed to raise their temperature than is needed to raise the temperature of water by the same amount. Most liquids have a specific heat less than half that of water and, in general, the specific heat of solids is lower than that of liquids.
thermal expansion
Thermal Expansion
  • An increase in volume of a material due to an increase in temperature .
  • Particles move farther apart as temperature increases
  • Gases expand the most
  • Used to measure changes in thermal energy.
  • Transfer of T.E. with no overall transfer of matter.
  • Particles are touching.
  • Faster in solids than gases because collisions are less.
  • Metals (conductors) conduct T.E. fast due to movement of molecules which is more free.
  • Any material that easily transfers thermal energy.
  • Best are metals such as gold and copper.
  • A material that conducts T.E. poorly.
  • Wood, plastic , rubber, air , foam cups
  • Wood heats slowly due to being a poor conductor of T.E.
  • Air is used in double pane windows and wool clothes as insulators.
  • Transfer of T.E. when particles move from one place to another. Due to density and temperature.
  • Convection currents occur when a fluid circulates in a loop as it alternates form heating up to cooling down.
  • Examples: ocean current, weather systems, rocks
  • Transfer of Energy by waves moving through space.
  • Heat lamps , microwaves, sun
chemical energy
Chemical Energy
  • The energy stored in chemical bonds.
  • When bonds are broken, the released energy can do work.
  • Wood is burned and energy is released as heat.
  • Examples: fuel , coal, gas
electromagnetic energy
Electromagnetic Energy
  • Energy transferred through space in waves.
  • Examples: visible light, x-rays, gamma rays, radio waves.
nuclear energy
Nuclear Energy

The energy stored in atomic nuclei.

Nuclear power plant uses fission reactions by splitting nuclei apart. This process releases energy.

Nuclear fusion releases energy when less massive nuclei combine to form a more massive nucleus.