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6Sci: Ch 2.2 - Energy Transformations & Law of Conservation of Energy (pgs 48-51)
Transcript of 6Sci: Ch 2.2 - Energy Transformations & Law of Conservation of Energy (pgs 48-51)
Changes Between Forms of Energy
An example of an energy transformation is when a microwave changes electric energy into radiant energy, which changes into thermal energy.
Changes Between Kinetic & Potential Energy
When you throw a ball upward, the ball has its greatest speed and the most kinetic energy when it first leaves your hand.
As the ball reaches its highest point, the ball gains its greatest potential energy.
As the ball moves downward, the potential energy decreases and kinetic energy increases.
This is another example of an energy transformation.
The Law of Conservation of Energy
The Law of Conservation of Energy states that energy can be transformed from one form into another or transferred from one region to another, but energy cannot be created or destroyed.
friction - a force that resists the sliding of two surfaces that are touching
- there is always some friction between two surfaces that are rubbing against each other
As you pedal a bicycle, you do work to transfer energy to the bicycle.
Because of the friction between moving parts of a bicycle, some of the work you do changes to thermal energy.
When you apply brakes on a bicycle, the bicycle's mechanical energy is not destroyed; instead, the bicycle's mechanical energy is transformed into thermal energy.
The total amount of energy remains the same.