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Energy

Energy. Wednesday 27 th May. Energy. Every thing we do needs energy:eating, sleeping, walking, ridding a bike, watching TV None of these can happen without energy. Without energy NOTHING can happen!. Movement. Every event, every single change involves movement.

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Energy

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  1. Energy Wednesday 27th May

  2. Energy • Every thing we do needs energy:eating, sleeping, walking, ridding a bike, watching TV • None of these can happen without energy. • Without energy NOTHING can happen!

  3. Movement • Every event, every single change involves movement. • To make things move ENERGY is needed.

  4. Source of energy • Where does a car gets its energy from? • Where does a cyclist get her energy from?

  5. Source of energy • Energy from petrol • Energy from the food she eats.

  6. What has energy? • Anything that can cause movement has energy.

  7. What are the main types of energy? Sound energy The energy in a sound wave makes your ear drum vibrate.

  8. Light energy • The energy of light waves can be used to generate electricity and make a motor turn around. • Also solar cells and solar panels.

  9. Heat energy • The molecules in a glass of hot water have more energy than those in a glass of cold water.

  10. Electrical energy • Electric currents have energy. • The electric current makes the motor turn in a car or in an electrical devise.

  11. Chemical energy • All fuels store energy • A chemical reaction with oxygen releases this energy • Food is our fuel and is a type of chemical energy • Chemical energy is sometimes called stored energy.

  12. Gravitational potential energy • When something is lifted up – it gains energy. • A crane lifting a block • People moving up a ski lift • Raising a book in the air

  13. Kinetic energy • (movement energy) • All moving things have energy • They can cause other things to move.

  14. Elastic potential energy • The energy stored in a rubber band can make a toy move

  15. Questions • What are the 8 main types of energy – give an example of each • Name the type of energy the following things have: • a firework rocket before its lit • A train travelling at 125mph • A bath full of hot water • A rock on the top of a hill • A tv set

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