Energy and Conservation of Energy (Leaving Cert Applied Maths): Flashcards

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Energy and Conservation of Energy
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Definition of energy

Ability to do work

Unit of energy

Joules (J)

1 kJ equals how many J?

1000 J

Define potential energy

Energy due to position or location

Potential energy formula

PE=mghPE = mgh

Define kinetic energy

Energy of a moving object

Kinetic energy formula

KE=12mv2KE = \frac{1}{2}mv^2

Law of conservation of energy

Energy cannot be created or destroyed, only transformed

Relationship between work and energy

Work done = Energy gained

Mechanical energy conservation equation

KE+PE=constantKE + PE = \text{constant}

Value of gg

9.8 m/s29.8 \text{ m/s}^2

Energy at pendulum's highest point

High PE, low KE

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