energy and energy resources
DESCRIPTION
What is energy?. Energy and Energy Resources. Energy and Work: Working Together. Energy - the ability to do work The unit for energy is Joule (J) – just like work. Kinetic Energy. Kinetic Energy- energy in motion All moving objects have kinetic energy Kinetic Energy = KE = mv 2 2. - PowerPoint PPT PresentationTRANSCRIPT
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What is energy?
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Energy- the ability to do work
The unit for energy is Joule (J)– just like work.
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Kinetic Energy- energy in motion
All moving objects have kinetic energy
Kinetic Energy = KE = mv2
2
2
2mvKE
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What is the kinetic energy of a car that has a mass of 1,200 Kg and is moving at a speed of 20 m/s?
KE= 1,200 x 20 x 20 ÷ 2 = _____________
What is the kinetic energy of a car that has a mass of 2,400 kg and is moving at 20 m/s? How does this kinetic energy of the car in the above example compare?
KE= 2,400 x 20 x 20 ÷ 2 = _____________
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Potential Energy- The energy that an object has because of the position, shape, or condition of the object
Gravitational Potential Energy - energy stored as a result of position or height.
▪ GPE = weight x height
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What is the gravitational potential energy of a book with a weight of 13 N at a height of 1.5 m off the ground?
GPE= 13 x 1.5 = _________________
What is the gravitational potential energy of a cat that weighs 40 N standing on a table that is 0.8 m above the ground?
GPE = 40 x 0.8 = ___________________
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What is the gravitational potential energy of a diver that weights 500 N standing on a platform that is 10 m above the ground?
GPE = 500 x 10 = _____________________
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Mechanical Energy- the total energy of motion and position of an object.
Mechanical Energy (ME) = potential energy + kinetic energy (J) (J) (J)
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What is the mechanical energy of a book being held in the air that has 100 J or potential energy and 50 J of kinetic energy?
100 + 50 = __________________
What is the mechanical energy of a goose standing on a rock that has 75 J of potential energy and 60 J of kinetic energy?
75 + 60 = _______________
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Thermal Energy- is all of the kinetic energy due to motion of the particles
Chemical Energy-The energy in a compound that changes as its atoms are rearranged
Electrical Energy- is the energy of moving electrons.
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Sound Energy- is caused by an object’s vibrations.
Light Energy- Produced by the vibrations of electrically charged particles.
Nuclear Energy- The energy that comes from the nucleus of an atom
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Friction-A force that opposes motion between two surfaces that are touching
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Energy cannot be created or destroyed.
Energy changes forms.