Physics

1
Work and Energy

• Physics

2
Work

• Work is defined as the transfer of energy
• Work is done when a force that is applied to an
  object moves that object
• W F x d ( Force x amount of movement)
• Units newton-meter or joule (the same for
  energy)
• MUST exert a force and move something to do work!

3
Energy

• The ability to do work
• Used to help us describe how and why things
  behave the way they do
• If you apply a force to an object, you may change
  its energy
• Energy must be used to do work
• Measure energy in joules

4
Types of Energy

• Kinetic Energy (KE)- if an object is moving, it
  has kinetic energy
• Potential Energy (PE)- energy that is stored
  because of the position and/or arrangement of the
  object
• Gravitational-
• Mass x Gravitys acceleration x height
• Potential energy in a spring

5
Type of Energy

• Chemical Energy- energy that is stored in
  molecular bonds, the forces that hold molecules
  together
• Mechanical Energy- gears, engines, locomotives
  pulling trains, canon balls flying through the
  air, or other examples of energy in mechanical
  devices
• Electrical Energy- the flow of charged particles
  called electrons or ions
• Thermal Energy- used as another term for internal
  energy or heat content

6
Conservation of Energy

• The Law states that energy can be neither created
  nor destroyed
• Therefore can only be converted from one form to
  another
• The total amount of energy remains the same but
  can be separated into various forms
• Transfer of Energy
• EX. Chemical-gt Potential-gt Mechanical-gtThermal