Energy – the ability to do work
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W = Fd = m( V f 2 - V i 2 ) 2 W = Fd = 1 m D v 2 2 - PowerPoint PPT Presentation


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Energy – the ability to do work W = Fd = m a d V f 2 = V i 2 + 2a D x V f 2 - V i 2 = + 2a D x V f 2 - V i 2 = a D x 2. W = Fd = m( V f 2 - V i 2 ) 2 W = Fd = 1 m D v 2 2 Kinetic Energy – energy of motion

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Energy – the ability to do work W = Fd = m a dVf 2 = Vi2 + 2aDx Vf 2 - Vi2 = + 2aDxVf 2 - Vi2 = aDx 2


W = Fd = m(Vf 2 - Vi2)

2

W = Fd = 1 mDv2

2

Kinetic Energy – energy of motion

KE = Ek = 1 mv2

2

units: kg (m/s) 2 = kg m 2 /s 2 = kg m/s 2 m

= N m

= Joule


Work-Energy Theorem Wnet = DEk Fd = KEf – KEiFd = 1 mv2f - 1 mv2i 2 2


Gravitational potential energy gpe ug mgh units kg m s 2 m joule
Gravitational Potential Energy GPE = Ug = mgh units: kg m/s2 m = Joule


Elastic potential energy pe elastic u s kx 2 k spring constant units n m 2 n m m equilibrium
Elastic Potential EnergyPEelastic = Us = ½ kx2k = spring constantunits: N m2 = N m mequilibrium


Mechanical Energy – sum of all kinetic energy and all types of potential energyME = KE + SPELaw of conservation of Mechanical EnergyEnergy cannot be created nor destroyed, it can only changed from one form to anotherMEi = MEf


Law of conservation of energy pe ke pe ke pe ke u g e k mgh 1 mv 2 2
Law of Conservation of EnergyPE + KE = PE + KE PE = KEUg = Ek mgh = 1 mv2 2


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