sci. 5-1 what is energy? pages 116-123
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Sci. 5-1 What is Energy? Pages 116-123. A. Energy - is the ability to do work and work is the transfer of energy. B. Both energy and work are expressed in Joules (J). C. Kinetic Energy - the energy of motion. D. Kinetic energy depends on. Speed. and. Mass. - PowerPoint PPT PresentationTRANSCRIPT
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Sci. 5-1What is Energy?Pages 116-123
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A. Energy- is the ability to do work and work is the transfer of energy
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B. Both energy and work are expressed in Joules (J).
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C. Kinetic Energy- the energy of motion.
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D. Kinetic energy depends on
and
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E.Speed has a greater impact on kinetic energy than does mass because speed is squared.
F. Kinetic Energy formula
m = mass v= speed
KE=mv
2
2
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G. Potential Energy- the energy an object has because of its position or shape. It has energy because work has been already done to it.
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H. Gravitational Potential Energy happens when something has been lifted. GPE = weight x height
Newtons x meters
Which is the same as work W=Fxd
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I. Mechanical Energy- the total energy of motion and position of an object.
1)Mechanical Energy = Potential Energy + Kinetic Energy
2) When potential energy increases, kinetic energy decreases.
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J. Six forms of energy are thermal, chemical, electrical, sound, light, and nuclear.
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1) Thermal Energy (heat) – all matter has particles in constant motion. The hotter the object then the faster the particles move.
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2) Chemical Energy- the energy of a compound that changes as its atoms rearrange to form a new compound
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3) Electrical Energy- the energy of moving electrons. Electrons are negatively charged particles of an atom.
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4) Sound Energy- caused by an object’s vibrations. The object vibrates which causes the air to vibrate which causes your eardrum to vibrate and you hear sound.
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5) Light Energy- produced by vibrations of electrically charged particles, NOT ALL light can be seen.
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6) Nuclear Energy- produced by an atom’s nucleus splitting or when two nuclei join together.