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PS-6 Test Review What must increase to effect the KE of an object the most? The velocity because it is squared in the formula… KE= ½ mv 2
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A car transfers chemical potential energy to _______ energy. Mechanical energy
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What effects the GPE of an object? Gravity, mass, & height
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What is the SI Unit for energy Joule (J)
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According to the law of conservation of energy, energy in the universe cannot be created or destroyed, therefore it is _________. transferred
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How much work is done when a 10N force is applied over a 3 meter distance? W = f x d = 10N x 3m = 30 J
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For an object to have KE, it must be________________. moving
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Where does a pendulum have: Maximum KE? Maximum PE? Increasing KE? Increasing PE?
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What are the requirements to do work? An object must move The motion of the object must be in the same direction as the applied force on the object
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You rub a balloon against your sweater: What charge does the balloon have and why? Negative – it picked up electrons from your sweater What charge does the sweater have and why? Positive – it has less electrons after transferring some to the sweater By what method was charge transferred? friction
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What is the difference? Charge by conduction Charging an object by contact Charge by induction Charging an object by holding a charged object near it Which of the above is lightning and why? Charge by induction…the clouds and the ground don’t touch each other
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What is static electricity? The accumulation of excess electric charges on an object Static meaning no motion
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Electroscope What does it detect? An unknown electric charge When the leaves spread apart what has happened? The charges are the same and repel How does it detect an unknown charge? leaves come together if the charges are different (attract)and will spread apart if like charges (repel)
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Electric Current What is it? The flow of electrons through a conductor How is it measured? Amperes (A) ______ is the force or push for electrons in a circuit and is measured in ______. Voltage, Volts (V) ______ is electrical friction and is measured in _________. Resistance, Ohms ()
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Ohm’s Law What is it? The current in a circuit = voltage divided by the resistance What is the current in a circuit with a 6 volt battery and 2 ohms of resistance? I = V/R = 6V / 2 = 3 A
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Electric Circuits A _______circuit has one path for electrons to flow. Series A _______ circuit has more than one path for electrons to flow. Parallel
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Series Circuit What happens if a bulb is removed? All the lights go out – open circuit If you add a bulb what happens to: Voltage - increases Current - decreases Resistance - increases
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Parallel Circuit What happens if a bulb is removed? The other bulbs stay lit & are brighter If a path is added, what happens to: Voltage – Stays the same Current - Increases w/ each path Resistance – decreases w/ each path
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Resistance in a circuit is effected by what 3 things? Large diameter – less resistance Long wires – greater resistance Increase in temperature – increase resistance
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Electromagnet What is it? Electricity runs through a wire and causes a magnetic field What can be done to increase it’s strength? Coil more wire around the object
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In electromagnetic induction, electric current is produced when a loop of wire is moved through a ___________. Magnetic field
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What is the difference between AC and DC current? AC =current moves back and forth DC = flows in one direction
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A generator converts _______ energy to ________ energy. Mechanical / Electrical An electric motor converts __________ energy to ________ energy. Electrical / Mechanical
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