Energy
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Energy. Energy. Energy is the ability to do work Comes in many forms Measured in joules (J) Objects can gain energy when work is being done to them Kicking a football Lifting an object. Forms of Energy. Mechanical – The energy associated with motion Walking or riding a bike

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Energy

Energy


Energy1

Energy

  • Energy is the ability to do work

  • Comes in many forms

  • Measured in joules (J)

  • Objects can gain energy when work is being done to them

    • Kicking a football

    • Lifting an object


Forms of energy

Forms of Energy

  • Mechanical – The energy associated with motion

    • Walking or riding a bike

    • Water in a waterfall

    • A car or a plane


Forms of energy1

Forms of Energy

  • Electromagnetic – moving electric charges

    • Electricity

    • Light


Forms of energy2

Forms of Energy

  • Nuclear – energy from the nucleus of an atom

    • Nucleus is split - Fission

    • Nuclei join - Fusion


Forms of energy3

Forms of Energy

  • Chemical – Breaking or making chemical bonds

    • Burning rocket fuel

    • Digesting food

    • Playing a sport


Forms of energy4

Forms of Energy

  • Heat – The internal motion of atoms

  • The faster particles move, the more heat energy is produced

    • Rubbing hands together – the friction converts mechanical energy to heat

    • Phase changes – like melting


Energy2

Energy

  • Does a ball have energy?

  • Does it have energy when it falls?

  • Can energy be created in the ball?

    • The ball had energy before it was dropped – potential energy

    • The ball had energy as it was dropped – kinetic energy


Kinetic energy

Kinetic Energy


Potential energy

Potential Energy

  • Potential Energy – the energy of position – stored energy

    • Stretched rubber band

    • The string on a bow before an archer shoots an arrow

    • An object before it is dropped

    • Undigested food


Potential energy1

Potential Energy


Conservation of energy

Conservation of Energy

  • The law of conservation of energy states that energy can be neither created nor destroyed

  • Does this sound familiar?

  • One form of energy can be converted into another - Newtons_Cradle_-_Incredible_Science.avi

  • Why is this important?


Conservation of energy1

Conservation of Energy

  • Because we like roller coasters!

  • In order for a roller coaster to work, energy must be conserved


Conservation of energy2

Conservation of Energy


Ticket out the door

Ticket Out the Door

  • At which point is kinetic energy the highest?


Ticket out the door1

Ticket Out the Door

  • At which point is potential energy the highest?


Conservation of energy3

Conservation of Energy

  • Design a Roller Coaster


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