Physics 2.1-4
- Created by: Sam Musgrove
- Created on: 23-03-13 18:05
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- Using Energy
- Conservation of Energy
- Energy cannot be created or destroyed
- Energy can be transferred from one form into another, or from one place to another
- Conservation of energy applies to all energy changes
- Energy and Efficiency
- No machine can be more than 100% efficient
- The efficiency of an appliance = useful energy transferred by the appliance / total energy supplied to the appliance (x100%)
- Measures to make machines more efficient include reducing friction, air resistance, electrical resistance, noise due to vibrations
- Useful Energy
- Useful energy and wasted energy both end up being transferred to the surroundings, which become warmer
- Wasted energy is energy that's not useful
- As energy spreads out it gets more and more difficult to use for further energy transfers
- Useful energy is energy in the place we want it and the form we need it
- Forms of Energy
- When an object falls and gains speed, its gravitational potential energy decreases and its kinetic energy increases
- Energy exists in different forms
- Energy can be transferred from one form into another
- Energy is measured in Joules (J)
- Conservation of Energy
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