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Principle of Conservation of Energy (1)
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Definition of useful energy
Is energy in a form that can be easily converted into other forms to do work
Definition of The Principle of Conservation of Energy
States that energy cannot be created or destroyed but can only be converted from one form to another
Oscillating systems such as the oscillation of a simple pendulum & the oscillation of a loaded spring
Experience transformation in forms of energy between gravitational potential energy or elastic potential energy & kinetic energy
Example of useful eergy
Chemical energy stored in fossil fuels

Transformation in the forms of energy for the bob between gravitational potential energy (gravitational P.E.) and kinetic energy (K.E.) at position X
- Gravitational P.E. = maximum (bob at maximum height) - K.E. = zero (bob stationary, speed = zero)

Transformation in the forms of energy for the bob between gravitational potential energy (gravitational P.E.) and kinetic energy (K.E.) from position X to Y (1)
- Gravitational P.E. of bob decreasing (height of bob decreasing) - K.E. of bob increasing (speed of bob increasing)

Transformation in the forms of energy for the bob between gravitational potential energy (gravitational P.E.) and kinetic energy (K.E.) at position Y
- Gravitational P.E. = minimum (bob at minimum height) - K.E. = maximum (bob at maximum speed)

Transformation in the forms of energy for the bob between gravitational potential energy (gravitational P.E.) and kinetic energy (K.E.) from position Y to Z (2)
- Gravitational P.E. of bob increasing (height of bob increasing) - K.E. of bob decreasing (speed of bob decreasing)

Transformation in the forms of energy for the bob between gravitational potential energy (gravitational P.E.) and kinetic energy (K.E.) at position Z
- Gravitational P.E. = maximum (bob at maximum height) - K.E. = zero (bob stationary, speed = ze

Transformation in the forms of energy for the bob between gravitational potential energy (gravitational P.E.) and kinetic energy (K.E.) from position Z to Y (3)
- Gravitational P.E. of bob decreasing (height of bob decreasing) - K.E. of bob increasing (speed of bob increasing)
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