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Unit 4 Mechanical Systems

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Unit 4 Mechanical Systems Topic 3 Energy, Friction, Efficiency Kinetic energy energy present in moving objects (joules) Potential energy stored energy (joules ... – PowerPoint PPT presentation

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Title: Unit 4 Mechanical Systems


1
Unit 4 Mechanical Systems
  • Topic 3
  • Energy, Friction, Efficiency

2
  • Kinetic energy energy present in moving objects
    (joules)
  • Potential energy stored energy (joules) in an
    object that is potentially available
  • There are many forms of potential energy.

3
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4
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5
  • Some forms of energy
  • Thermal energy (heat) total energy of all
    moving particles in a substance or object
  • Chemical energy energy stored in foods and
    fuels
  • Mechanical energy energy associated with
    machines

6
Other Forms of Energy
  • Solar Energy
  • Sound Energy
  • Tidal Energy
  • Gravitational Energy
  • Light Energy
  • Wind Energy

7
  • Energy converter device that can convert energy
    from one form to another
  • Energy transmitter device where energy is
    transmitted from one place to another, but no
    energy is converted

8
  • E.x. The school bell converts chemical energy to
    mechanical energy to sound energy.

9
  • E.x. The mechanical mouse converts chemical
    energy (from our bodies) to mechanical energy.

10
  • What conversion happens
  • in a solar heater?
  • A solar heater converts light energy into heat
    energy.
  • (or light into electrical)

11
  • What energy conversion takes place in a toy
    rocket?
  • The rocket changes chemical energy to mechanical
    energy, heat energy, light energy and sound
    energy.

12
  • The efficiency of a machine tells you how much
    input energy was transferred to the load by the
    machine (output).
  • Efficiency output energy
  • input energy

13
  • Every time a machine does work, some energy is
    lost due to friction (ex. blades on scissors
    rubbing together)
  • Reducing friction (by adding lubricant such as
    oil or grease) makes machines more efficient.
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