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Chapter 5. Energy. Energy and Work. Energy – the ability to cause change. Kinetic energy – energy in the form of motion. Potential energy – stored energy. Work – the transfer of energy through motion. Work = Force x Distance W = FD Units = Joules ( Newtons x meters).

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chapter 5

Chapter 5

Energy

energy and work
Energy and Work
  • Energy – the ability to cause change.
  • Kinetic energy – energy in the form of motion.
  • Potential energy – stored energy.
  • Work – the transfer of energy through motion.
    • Work = Force x Distance
    • W = FD
        • Units = Joules (Newtons x meters)
conservation of energy
Conservation of Energy
  • Mechanical energy – the total amount of kinetic and potential energy in a system.
  • Law of conservation of energy – states that energy can change form but it cannot be created or destroyed under ordinary conditions.
human energy
Human Energy
  • Calorie – a unit used by nutritionists to measure how much energy we get from specific foods.
    • 1 calorie ( = 1 kilocalorie) – 4180 Joules.
    • Each gram of fat supplies 9 calories of energy.
temperature and heat
Temperature and Heat
  • Temperature – a measure of the average kinetic energy of the particles in a sample of matter.
  • Thermal energy – is the total energy of the particles in a material.
  • Heat – the thermal (or internal) energy that flows from something with a higher temperature to something with a lower temperature. (i.e. heat is energy transferred between objects at different temperatures.
thermal pollution
Thermal Pollution
  • Thermal pollution – when waste heat significantly changes the temperature of the environment.
measuring thermal energy
Measuring Thermal Energy
  • Specific heat – amount of energy it takes to raise the temperature of 1kg of a substance by 1o C.
  • Thermal Energy Equation
    • Q = mc∆T
    • Q is change in thermal energy
    • m is mass
    • c is specific heat
    • ∆ is the final temp. – the initial temp.
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