# Unit 4 Mechanical Systems - PowerPoint PPT Presentation

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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.