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P2.3 Work Energy & Momentum


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Kinetic Energy
Energy of a moving object due to its motion; kinetic energy (in joules, J) = mass (in kilograms, kg) x (speed)2 (in m2/s2).
Gravitational Potential Energy
Energy of an object due to its position in a gravitational field. Near the Earth's surface, change of g.p.e. (in joules, J) = weight (in newtons, N) x vertical distance moved (in metres, m).
Elastic Potential Energy
Energy stored in an elastic object when work is done to change its shape.
Momentum
This equals mass (in kg) x velocity (in m/s). The unit of this is the kg m/s.
Power
The energy transformed or transferred per second. The unit of this is the watt (W).