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Laws of Motion and Energy - PowerPoint PPT Presentation


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Laws of Motion and Energy. Chapter Six: Energy and Machines. 6.1 Energy and Conservation of Energy 6.2 Work and Power 6.3 Simple Machines. Investigation 6A. Energy Transformations on a Roller Coaster. Where does the marble move the fastest and why?. 6.1 Energy.

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Presentation Transcript
chapter six energy and machines
Chapter Six: Energy and Machines
  • 6.1 Energy and Conservation of Energy
  • 6.2 Work and Power
  • 6.3 Simple Machines
investigation 6a
Investigation 6A

Energy Transformations on a Roller Coaster

  • Where does the marble move the fastest and why?
6 1 energy
6.1 Energy
  • Energyis a quantity that measures the ability to cause change in an object or system.

We get energy from the changes in food when it is digested and stored in the body.

6 1 energy1
6.1 Energy
  • The unit of measurement for energy is the joule(J).
  • One joule is the energy needed to push with a force of 1 newton over a distance of 1 meter.
6 1 systems and variables
6.1 Systems and variables
  • A systemis a group of objects and the factors that affect these objects.
  • In the car and ramp system color, light and friction were not included in the system.

What factors were included in the car and ramp system?

6 1 systems and variables1
6.1 Systems and variables
  • A factor that affects a system is called a variable.

Can you name these five variables?

6 1 systems and variables2
6.1 Systems and variables
  • You may change the system later to include new objects, effects, or variables such as friction.
6 1 energy in systems
6.1 Energy in systems
  • Energyis a measure of a system’s ability to change or create change in other systems.
  • Energy is an important variable in all systems.

The energy the car has due to height can be compared on a ramp.

6 1 kinds of energy
6.1 Kinds of energy
  • Energy appears in many forms, such as heat, motion, height, pressure, electricity, and chemical bonds between atoms.
  • Energy can transfer from one form to another.
6 1 law of conservation of energy
6.1 Law of conservation of energy
  • The idea that energy converts from one form into another without a change in the total amount is called the law of conservation of energy.

A bow and arrow transform energy from the stretched bow to the motion of the arrow.

6 1 energy transformation
6.1 Energy transformation
  • The marble and the track are a system.
  • This system has two major kinds of energy called potential energyand kinetic energy.
6 1 energy transformation1
6.1 Energy transformation
  • Potential energyis energy due to position.
  • When you lift the marble off the ground it gets potential energy because of its height.
6 1 energy transformation2
6.1 Energy transformation
  • As the marble moves down the track, it loses potential energy.
  • Potential energy is converted into kinetic energy, which is the energy of motion.
6 1 energy transformation3
6.1 Energy transformation
  • The marble slows down as it goes uphill because kinetic energy is being changed back into potential energy.
6 1 energy transformation4
6.1 Energy transformation
  • Conservation of energy says the total energy stays the same as the marble moves up and down.
  • The marble has the most kinetic energy when its speed is greatest.
6 1 energy in your life
6.1 Energy in your life
  • A joule is a tiny amount of energy compared to what you use every day.
  • Some units of energy that are more appropriate for everyday use are the kilowatt-hour, food calorie, and British thermal unit.
6 1 conserving energy
6.1 Conserving Energy
  • When you “use” energy by turning on a light, you are really converting energy from one form (electricity) to other forms (light and heat).
6 1 conserving energy1
6.1 Conserving Energy
  • Electric power plants don’t make electrical energy.
  • Energy cannot be created.
  • Energy CAN be converted from other forms of energy such as chemical, solar, or nuclear energy.
6 1 conserving energy2
6.1 Conserving Energy
  • An average electric power plant puts out 1,000,000 kwh of electrical energy per hour.
  • That means 120 power plants are burning up resources each hour just to run light bulbs!