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Title:

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 ... – PowerPoint PPT presentation

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Title: Energy


1
Energy
2
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

3
Forms of Energy
  • Mechanical The energy associated with motion
  • Walking or riding a bike
  • Water in a waterfall
  • A car or a plane

4
Forms of Energy
  • Electromagnetic moving electric charges
  • Electricity
  • Light

5
Forms of Energy
  • Nuclear energy from the nucleus of an atom
  • Nucleus is split - Fission
  • Nuclei join - Fusion

6
Forms of Energy
  • Chemical Breaking or making chemical bonds
  • Burning rocket fuel
  • Digesting food
  • Playing a sport

7
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

8
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

9
Kinetic Energy
  •  

10
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

11
Potential Energy
  •  

12
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?

13
Conservation of Energy
  • Because we like roller coasters!
  • In order for a roller coaster to work, energy
    must be conserved

14
Conservation of Energy
15
Ticket Out the Door
  • At which point is kinetic energy the highest?

16
Ticket Out the Door
  • At which point is potential energy the highest?

17
Conservation of Energy
  • Design a Roller Coaster
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