Chapter 5

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# Chapter 5 - PowerPoint PPT Presentation

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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Presentation Transcript

### 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)
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
• 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 – 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 – when waste heat significantly changes the temperature of the environment.
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.