Physics Final.pdf - Physics Final Exam Review Chapter 10 Work Energy and Simple Machines Work the process of changing the energy in a system Scalar

Physics Final.pdf - Physics Final Exam Review Chapter 10...

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Physics Final Exam Review Chapter 10: Work, Energy, and Simple Machines Work: the process of changing the energy in a system Scalar Quantity Force and displacement must be parallel - No work no motion, perpendicular force and displacement Unit: Joule (J) 1 Joule=1 Nm Power: the amount of energy transferred in a unit of time (rate at which work is done) Unit: Watt (W) Positive work increases the energy in a system; negative work decreases it Two people apply the same force for the same distance in different amounts of time. Their work will be the same and their power will be different Chapter 11: Energy and its Conservation Forms of Energy Kinetic Energy : an object’s energy due to motion Potential Energy : the energy stored in an object due to its state, position, or form W= Δ PE - Examples: compressing spring, stretched rubber band, drawn bow and arrow
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Gravitational Potential Energy : potential energy of an object due to its position above the reference level - Reference Level : location at which PE is chosen to be zero Height is positive above it and negative below it Mechanical Energy : the sum of the kinetic and potential energy in a system Work-Energy Theorem : work done on an object is equal to the change in kinetic energy W = Δ KE Negative work=decreasing KE Positive work=increasing KE - If an object starts from rest, W=KEf - If an object comes to rest, W=-KEi Law of Conservation of Energy : in a closed, isolated system the total energy remains the same Closed : nothing enters or leaves Isolated : no external forces KEi+PEi=KEf+PEf Chapter 12: Momentum and its Conservation Momentum : product of an object’s mass and velocity Impulse : the product of the average force on an object and the time interval over which it acts; vector Impulse-Momentum Theorem: the impulse of an object is equal to the change in momentum I= Δ P
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