u2c1 vocabulary. law of conservation of energy energy is neither created nor destroyed
TRANSCRIPT
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U2C1
Vocabulary
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Law of Conservation of Energy
Energy is neither created nor destroyed
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When we use energy, it does NOT disappear
Energy transfers from object to object
A car engine burns gasoline, converting the chemical energy in gasoline into mechanical energy
Solar cells change radiant energy into electrical energy
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Law of Conservation of Energy
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EnergyEnergycauses interactionsability to do work or cause change
causes interactionsability to do work or cause change
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Energy
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Energy as Work
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Potential Energy
•stored energy
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Potential Energy
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Potential Energy
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potential energy
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Kinetic Energy
•Energy in motion
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kinetic energy
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kinetic and potential energy
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Energy SourceAn object that is the supplier of energy.
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energy source
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Energy Receiver
An object to which the energy is transferred.
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energy receiver
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Light
flashlight
Change in shape (pupil got smaller)
eye
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Electric Circuit
cell
Change in illumination (light goes on/glows)
light bulb
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energy transfers
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Other Forms of Energy
•mechanical energy•thermal energy•chemical energy•electrical energy•electromagnetic energy•nuclear energy
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Waves
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waves, part 2
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wavewave a continuous succession of pulses
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wave
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wave
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wave
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transverse wave a wave in which the motion of the material (medium) is perpendicular to motion of the wave
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transverse wave
Motion Motion
Force Force
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transverse wave
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amplitude
the height of a wave crest. It is related to a wave’s energy
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amplitude
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amplitude
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wavelength the distance between identical points along a wave
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wavelength
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frequency
the number of waves produced per unit time
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frequency
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Identify A?Identify B?
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compression (longitudinal) wave
a wave in which the motion of the material (medium) is parallel to the motion of the wave
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compression (longitudinal) wave
Motion Motion
Force Force
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compression (longitudinal) wave
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Types of Mechanical Waves
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pitch
the quality of a sound dependent mostly on the frequency of the sound wave
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pitch
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sound energy
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sound waves
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ultrasound
compression waves at much higher frequency that animals or humans can hear
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ultrasound
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fault
a fracture in rock, along which the rock masses have moved
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fault
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earthquake
a sudden motion or shaking of the earth
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earthquake
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P wave a seismic wave that involves motion in the direction in which it is traveling: it is the fastest of the seismic waves
(compression wave)
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P wave
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P wave
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S wave a seismic wave that involves vibration perpendicular to the direction the wave is traveling: it arrives later than the P wave(transverse wave)
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S wave
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L wave a seismic wave that travels along the surface of the Earth: they are the last to arrive at a location
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L wave
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seismograph
an instrument that detects seismic waves
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seismograph
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tsunami
a great sea wave produced by an earthquake (or volcanic eruption) on the ocean floor
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wave interference
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light waves
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wave quiz
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mechanical energythe energy transfer involved in an interaction that causes one or both objects to change position
push or pull applied an object
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mechanical energy
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forms of energy
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constant speed
neither speeding up nor slowing down
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constant speed
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linear relationship
the relationship between two quantities that, when plotted against each other on a graph, produce a straight line
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linear relationship
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linear relationship
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slopethe tilt or slant of a straight line on a graph: the rise divided by the run
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slope
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speeddistance traveled per unit timeexample: 55 mph
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speed
speed = distance time
s = d t
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speed
d
s t
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average speed
the distance traveled divided by the time taken
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average speed
average speed = total distance total time
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average speed
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nonlinear relationship
the relationship between two quantities that, when plotted against each other on a graph, do not produce a straight line
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nonlinear relationship
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nonlinear relationship
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velocity•how fast an object is moving in a given direction•speed and direction
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velocity
East at 750 mph
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accelerationthe change in velocity per unit time
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accelerationa = change in v time
a=(final v - initial v) time
fit(f-i)t
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acceleration
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