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Physics, Earth, and Space Science 1.4
Demonstrate Understanding of Energy in a physical system
Achievement Standard 92047
Demonstrate Understanding of Energy in a Physical System
Forms of energy (Joules) and the formulae that indicate their form include:
Mechanical energy
kinetic energy, Ek = ½ mv2
gravitational potential energy, Ep = mgh
work, W= Fd (Watt)
Power, P=W/t
Thermal energy
heat capacity, E (thermal) = mcΔT
latent heat, E (thermal) = mL
Electrical energy
P = VI (Watt)
V = IR
ΔE = Pt
Forms of Energy:
Mechanical energy
Thermal energy
Electrical energy
Energy Concepts:
energy transfer
energy transformation
conservation of energy
The text is all copied from NCEA. I have broken it into 4 Subtopics, each with their own pages - click on the pages :-)
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A Physical System
A physical system refers to a defined space with either an object or interacting objects. Everything outside the physical system is known as the environment or surroundings.
Examples of a physical system include: thermos flask, an insulated home, electrical circuits, falling objects, the lifting of objects.
Change in a physical system is any change to the properties or the system's behavior.
Examples of changes include changes in:
starting height of a falling object
motion
the resistance of a wire
the temperature of an object.
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