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# 02-08-08 - Potential Energy

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• 1. Unit 8 (Chapter 10 & 11) Potential Energy
• 2. Energy
• Energy is defined as the ability to do work
• 6 Types of energy
• Kinetic Energy: associated with motion
• Heat: associated with the speed of internal particles
• Chemical: bonds atoms together
• Electromagnetic: moving electric charges
• Nuclear: in the atomic nucleus
• Potential Energy: energy of position (energy at rest)
• 3. Energy
• The units of energy are joules
• joules are also the same unit as work!
• (How Confusing!)
• You can think of energy as stored work – that is ready to be released!
• Energy cannot be created or destroyed – only changed from one type of energy to another!
• 4. Potential Energy
• Is energy stored in an object
• due to its position
• Potential Energy is also
• considered energy at rest
• GPE = mass x acceleration due to gravity x height
Potential Energy Potential Energy (joules) m - mass of object in kg g - acceleration of gravity in m/s 2 h - height of object, in m GPE – gravitational potential energy in J GPE = mgh
• 5. Potential Energy
• Gravitational potential energy depends on an objects mass and height
• Objects with potential energy don’t use their energy until they start moving.
• The further the object is from the ground the more potential energy it has
• Chemical potential energy is energy stored in the form of chemical bonds.
• 6. Law of Conservation of Energy
• Energy can never be created or destroyed just turned into another form.
• 7. Law of Conservation of Energy
• When a ball flies through the air it does not lose energy even though it slows down and speeds up
• The energy in the ball changes from kinetic to potential and then back to kinetic energy