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Energy

Energy. By: Mr. Meringolo. Before We Begin… Copy down the following questions. You will answer them throughout the powerpoint . Give three examples of when energy is used. What is the difference between potential and kinetic energy? Name two types of potential energy.

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Energy

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  1. Energy By: Mr. Meringolo

  2. Before We Begin… Copy down the following questions. You will answer them throughout the powerpoint. • Give three examples of when energy is used. • What is the difference between potential and kinetic energy? • Name two types of potential energy. • What are three different forms of energy? • Give an example on how energy can transfer from one form to another. • How is Heat energy produced? • What does the law of conversation of energy state?

  3. Nature of Energy • Energy is all around you! • You can hear energy as sound. • You can see energy as light. • And you can feel it as wind.

  4. Nature of Energy • You use energy when you: • hit a softball. • lift your book bag. • compress a spring.

  5. The Law of Conservation of Energy • Energy can be neither created nor destroyed, It can only be converted from one form to another.

  6. Nature of Energy • What is energy that it can be involved in so many different activities? • Energy can be defined as the ability to do work. • If an object or organism does work (exerts a force over a distance to move an object) the object or organism uses energy.

  7. Kinetic vs. Potential Energy • Kinetic Energy: the energy of motion • Potential Energy: stored energy

  8. Kinetic Energy • The energy of motion is called kinetic energy. • The faster an object moves, the more kinetic energy it has. • The greater the mass of a moving object, the more kinetic energy it has.

  9. Potential Energy • Potential Energy is stored energy. • Stored chemically in fuel, the nucleus of atom, and in foods. • Or stored because of the work done on it: • Stretching a rubber band. • Winding a watch. • Pulling back on a bow’s arrow. • Lifting a brick high in the air.

  10. Gravitational Potential Energy • Potential energy that is dependent on height is called gravitational potential energy.

  11. Potential Energy • Energy that is stored due to being stretched or compressed is called elastic potential energy.

  12. Kinetic-Potential Energy Conversion • Roller coasters work because of the energy that is built into the system. Initially, the cars are pulled mechanically up the tallest hill, giving them a great deal of potential energy. From that point, the conversion between potential and kinetic energy powers the cars throughout the entire ride.

  13. Forms of Energy • The five main forms of energy are: • Heat • Chemical • Electrical • Nuclear • Mechanical

  14. Heat Energy • The internal motion of the atoms is called heat energy, because moving particles produce heat. • Heat energy can be produced by friction. • Heat energy causes changes in temperature and phase of any form of matter.

  15. Chemical Energy • Chemical Energy is required to bond atoms together. • And when bonds are broken, energy is released. • Fuel and food are forms of stored chemical energy.

  16. Electrical Energy • The movement of electrons through matter • Electricity is a form of electrical energy • Power lines carry electromagnetic energy into your home in the form of electricity.

  17. Nuclear Energy • The nucleus of an atom is the source of nuclear energy. • When the nucleus splits (fission), nuclear energy is released in the form of heat energy and light energy. • Nuclear energy is also released when nuclei collide at high speeds and join (fuse).

  18. Mechanical Energy • The energy of moving things • When you ride a bike you use mechanical energy • When you kick a football, you give mechanical energy to the football to make it move

  19. Light Energy (Radiant Energy) • The energy carried by light • whenever you are looking at light, you are looking at energy

  20. Sound Energy • Vibrates air molecules • The air molecules move tiny bones in your ear • The message of sound then moves to your brain • Can also vibrate objects

  21. Energy Conversion • Energy can be changed from one form to another. Changes in the form of energy are called energy conversionsor energy transformations. • All forms of energy can be converted into other forms. • The sun’s energy through solar panels can be converted directly into electricity. • Green plants convert the sun’s energy (electromagnetic) into starches and sugars (chemical energy).

  22. Energy Conversions Chemical  Heat Mechanical

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