transfer of energy
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Transfer of Energy
Energy Conservation and Conservation
Learning Targets
KNOWLEDGE Know that there are different forms of energy Understand that energy can change forms, but it is never
lost SKILL
Using photograph or illustration, identify how potential and kinetic energy are being transferred
Reasoning Analyze how energy goes through transformations
Product Draw and label a diagram that shows different energy
conversions
Questions to Think About
How are different forms of energy related? Examples. Think about when you rub your hands together. When you are cold how do you warm up.
What is the Law of Conservation of Energy?
Major Forms of EnergyMechanical Energy
Thermal Energy
Chemical Energy
Electrical Energy
Electromagnetic Energy
Nuclear Energy
Conversions Between Forms of Energy
Energy Conversion A change from one form
of energy to another
Also know as a energy transformation
Any form of energy can be converted into any other form
Energy Conversions
Energy ConversionsElectromagnetic
Move Muscles
Heat Body
Brain Thinking
Electromagnetic
Energy Conversions
Electromagnetic
Energy ConversionsHot Spark
Burning Gas
Car Moving
Electromagnetic Engine
Energy Conversions
Kinetic And Potential ConversionsMost common energy conversions is the conversion of potential energy to kinetic energy.
Energy Conversion in Juggling Any object that rises or falls
change in its KE and PE
Movement=KE
Rises=decrease in KE and increase in PE
Highest Point=movement stops and high in PE and no KE
Falls=decrease in PE and increase in KE
Energy Conversion in Waterfalls With waterfalls PE gets
converted to KE on a large scale
Water at the top has a lot of PE due to height
As the water falls, its height decreases and it loses PE
At the same time, its KE increases because the velocity increases
Energy Conversion in Pole Vault Pole vaulter runs=PE
Plants pole to jump and pole bends= Elastic PE
Pole straightens out and pole vaulter is lifted high in the air= Gravitational PE
Gravitational PE is converted to KE as the pole vaulter falls to the ground
Energy Conversion in a Pendulum
Continuous conversion of KE and PE
At the highest point of the swing the pendulum only has Gravitational PE
As the pendulum starts to swing downward, it speed up and converts to KE
At the bottom of the swing all of its energy is KE
As it swings to the other side the pendulum slows down, regains Gravitational PE and loses KE
At the the top of the other side it again has only Gravitational PE
Conservation of Energy Is energy destroyed over
time?
LAW OF CONSERVATION OF ENERGY States that when one form of
energy is converted to another, no energy is destroyed in the process
Energy cannot be created or destroyed
All energy is accounted for-total amount of energy is the same before and after any process
Energy and Friction What cause the pendulum to stop swinging?
Friction at pivot point of the string
Friction of the pendulum through the air
Atoms and molecules increase movement with when something experiences friction
Thermal energy increases
Mechanical energy is converted to thermal energy
Pendulum slows down, but is energy is not destroyed
Rub cold hands together to warm them up (mechanical to thermal transfer)
Conserving Energy
Conserving EnergyMeans SAVING energy, or not WASTING it
Not wasting fuels such as gasoline or other resources
Energy is always conserved because its total quantity does not change
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