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Ch 15.1. Energy and Its Forms. Energy and Work. Work is done when a force moves an object a distance Work is a transfer of energy. Energy is the ability to do work Both measured in J. Kinetic Energy. Energy of motion Depends on mass and speed. KE = ½ mv2 SI Units: KE- m- v-.

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energy and work
Energy and Work
  • Work is done when a force moves an object a distance
  • Work is a transfer of energy
  • Energy is the ability to do work
  • Both measured in J
kinetic energy
Kinetic Energy
  • Energy of motion
  • Depends on mass and speed
  • KE = ½ mv2

SI Units:

  • KE-
  • m-
  • v-
ke practice
KE Practice
  • A 0.10 kg bird is flying at a constant speed of 8 m/s. What is the birds kinetic energy?
  • Given:
  • Formula:
  • Solve:
potential energy
Potential Energy
  • Energy that is stored due to position or shape
  • Stored energy turns into KE
potential energy1
Potential Energy
  • PE that depends upon an objects height
  • Increases with increased height
  • PE = mgh

SI Unit

  • m-
  • g-
  • h-
  • PE that is stretched or compressed
  • Object springs back to its original shape

Gravitational PE

Elastic PE

forms of energy
Forms of Energy
  • Energy associated with motion and position of everyday objects
  • Sum of PE and KE
  • Total PE and KE of all the microscopic particles in an object
  • Particles move faster, becoming warmer



forms of energy1
Forms of Energy
  • Energy stored in chemical bonds
  • Energy associated with electric charges



forms of energy2
Forms of Energy
  • Form of energy that travels through space in the form of waves
  • Energy stored in the atomic nucleus
    • Fission- releases energy, splits apart
    • Fusion- releases energy, comes together



conservation of energy
Conservation of Energy
  • Energy cannot be created or destroyed
    • It is transferred or converted
energy conversion
Energy Conversion
  • Energy can be converted from 1 form to another
  • Process of changing energy – energy conversion
  • Gravitational PE converts into KE as an object falls
energy conversions
Energy Conversions
  • Pendulums
    • PE constantly converted back and forth to KE
    • Stays in motion due to weight
  • Pole Vaults
energy conversion calculations
Energy Conversion Calculations
  • KE + PE = KE + PE

(Beginning) (End)

  • KE=
  • PE=
conversion practice
Conversion Practice
  • A 1.50kg brick is dropped from rest and hits the ground at a speed of 26m/s. Ignore air resistance, calculate PE before the brick was dropped.
  • Given:
  • Formula:
  • Solve:
energy and mass
Energy and Mass
  • Albert Einstein
    • Theory of Relativity
    • E = mc2
    • Energy and mass are equivalent and can be converted into each other
    • c= speed of light 3.0 x 108 m/s
nonrenewable energy
Nonrenewable Energy
  • Exists in limited quantities
  • Once used, it can’t be replaced except over the course of millions of years
    • Natural Gas
    • Coal
    • Uranium
  • Also known as fossil fuels
renewable energy
Renewable Energy
  • Can be replaced in relativity short periods of time
renewable energy1
Renewable Energy
  • Hydroelectric
    • Energy from flowing water
  • Solar
    • Sunlight converted into useable energy
renewable energy2
Renewable Energy
  • Geothermal
    • Thermal energy beneath Earths surface
  • Others
    • Biomass Energy
      • Energy stored in living things
    • Hydrogen Fuel
      • Creates electricity by reacting hydrogen and oxygen
conserving energy resources
Conserving Energy Resources
  • Reduce energy needs
  • Increase the efficiency of energy use