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# Ppt Energy

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### Transcript

• 1. ENERGY
• 2. Energy
• Everything in the universe can be classified as either matter or energy.
• Matter is anything that has mass and takes up space.
• Energy is everything else like……
• 3. Energy
• Kinetic energy
• Potential energy
• Electricity
• Nuclear energy
• Light
• Sound
• Chemical
• Thermal (heat)
• 4. Energy
• Energy is…
• The ability to cause change
• The ability to do work.
• 5. Energy
• The unit for energy is the joule.
• 1 joule = 1 kg- m 2 /s 2
• 6. Kinetic Energy
• Kinetic energy (KE) is energy in the form of motion.
• The amount of kinetic energy an object has depends on its ___________ and _________ .
• KE = ½ mv 2
• 7. Kinetic Energy
• Which has more kinetic energy?
• A bus traveling at 65 mph
• A car traveling at 65 mph
• Which has more kinetic energy?
• A bus traveling at 65 mph
• A bus traveling at 40 mph
• 8. Potential Energy
• Potential energy is ___________ energy.
• The amount of potential energy depends on its ____________ or ___________.
• Potential energy due to the object’s height above the earth’s surface is called ______________ .
• 9. Gravitational Potential Energy
• The formula for gravitational potential energy is…
• GPE = mgh
• 10. Gravitational Potential Energy
• Which has more GPE?
• A boy sitting in a tree 12’ above the ground
• A squirrel sitting in a tree 12’ above the ground.
• Which has more GPE?
• A squirrel sitting 12’ above the ground
• A squirrel sitting 30’ above the ground.
• 11. The Law of Conservation of Energy
• Energy cannot be created or destroyed only transformed from one form into another.
• 12. WORK
• The scientific definition of work is ….
• Work, like energy, is measured in ________
• The formula for work is…
• W = F x D
• 13. WORK
• Two factors must be considered when deciding if work is being done
• Does the object move?
• What is the actual force applied?
• 14. He may expend energy when he pushes on the wall, but if it doesn’t move, NO WORK is performed on the wall!!!
• 15. WORK
• In which case, would more work be done?