energy is all around you. physical science studying the interaction between matter and energy
TRANSCRIPT
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Energy
Is all around you
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Physical Science
Studying the interaction between matter and energy
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Nature of Science
• You hear energy as sound, you see energy as light, you can feel energy in wind.
• Living organisms need energy for growth and movement.
• You use energy when you hit a tennis ball, lift a grocery bag, or compress a spring.
• Energy is the ability to do work and work is the transfer of energy.
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Forms of Energy
• Energy appears in many forms. The following are some forms of energy:
• Mechanical• Heat• Chemical• Electrical• Sound • Light• Nuclear
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Mechanical Energy
• Energy possessed by an object due to its motion or stored because of its position.
• Two types of mechanical energy:– Kinetic energy
– Potential energy
• Units Joules
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Mechanical Energy
Kinetic Energy - Energy due to the motion of a body
KE = ½ mv2
Kinetic Energy (J) mass (kg)velocity (m/s)
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“If you ain’t first, you’re last” claims famed race car driver Ricky Bobby. If Ricky’s 720 kg car has 4,844,000 J of kinetic energy, how fast does he go to keep in first place?
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Mechanical Energy
Potential Energy - Stored energy because of relative position between interacting bodies.
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PE = mgh
Potential Energy (J)mass (kg)
Acceleration due to gravity
height (m)
Potential Energy
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• The Millenium Park fountain in Chicago appears to have water spitting from the mouth of a Chicago citizen. If 500 kg of water spray out of the fountain and carries 12,000 J of gravitational potential energy, how high does the water spray from?
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What type of mechanical energy do the blocks have?
Potential Energy
Both Potential and Kinetic
Kinetic Energy
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Law of Conservation of Energy
• Energy cannot be created nor destroyed.
• Total energy before = total energy after
• KEi + PEi = KEf + PEf