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Lecture12

# Lecture12 - Work summary Work done by a force describes...

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Work - summary = f i x x dx ). x ( F w W = F d Constant force General formula (constant and variable forces) Work done by a force, describes what is accomplished by the action of that force when it acts over some distance

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The five main forms of energy are: – Heat – Chemical – Electromagnetic – Nuclear – Mechanical Energy Energy is a concept closely related to work Work is energy transferred to or from an object by a force acting on the object Energy can be changed from one form to another. Changes in the form of energy are called energy conversions . Chemical energy -> heat energy (by burning fuel) Heat energy -> mechanical energy . Car engine
Mechanical Energy When work is done to an object, it acquires energy. The energy it acquires is known as mechanical energy. Kinetic Energy Potential Energy This is the most common form of energy conversion All forms of energy can be in two states:

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Kinetic Energy Energy of motion Motion with uniform acceleration W = F net d = ma d v 2 f = (v 0 2 +2ad) W = m d v f 2 – v 0 2 2d a = v f 2 – v 0 2 2d W net = m v f 2 - m v 0 2 1 2 1 2 Kinetic Energy (K) >0 always!
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Lecture12 - Work summary Work done by a force describes...

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