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Unit 5 – Lecture 1

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Page 1: Unit 5 – Lecture 1. Energy Energy – the ability to do work the ability to cause change measured in joules symbol: [as in.. E = mc 2 ] E

Unit 5 – Lecture 1

Page 2: Unit 5 – Lecture 1. Energy Energy – the ability to do work the ability to cause change measured in joules symbol: [as in.. E = mc 2 ] E

EnergyEnergy – the ability to do work

the ability to cause changemeasured in joulessymbol:

[as in.. E = mc2]

E

Page 3: Unit 5 – Lecture 1. Energy Energy – the ability to do work the ability to cause change measured in joules symbol: [as in.. E = mc 2 ] E

EnergyTwo descriptions:

Potential Energystored energy

[due to position or condition]Kinetic Energy

energy of motion / released energy

Page 4: Unit 5 – Lecture 1. Energy Energy – the ability to do work the ability to cause change measured in joules symbol: [as in.. E = mc 2 ] E

Potential EnergyThree Types:Elastic PE

energy stored by something that can stretch or compress [rubber band or spring]

Page 5: Unit 5 – Lecture 1. Energy Energy – the ability to do work the ability to cause change measured in joules symbol: [as in.. E = mc 2 ] E

Potential EnergyThree Types:Chemical PE

energy stored in chemical bonds

Page 6: Unit 5 – Lecture 1. Energy Energy – the ability to do work the ability to cause change measured in joules symbol: [as in.. E = mc 2 ] E

Potential EnergyThree Types:Gravitational PE

energy stored because of position above earth’s surface

Page 7: Unit 5 – Lecture 1. Energy Energy – the ability to do work the ability to cause change measured in joules symbol: [as in.. E = mc 2 ] E

Potential EnergyGravitational PE:

PEgravitational = mass * accel. of gravity * height

PEgravitational = m g h

Remember, g = 9.8 m/s2

Page 8: Unit 5 – Lecture 1. Energy Energy – the ability to do work the ability to cause change measured in joules symbol: [as in.. E = mc 2 ] E

Potential EnergyGravitational PE:

so…what’s the unit?PEgravitational = m g h

PEgravitational = kg * (m/s2) * m

PEgravitational = N * m

PEgravitational = Joules

Page 9: Unit 5 – Lecture 1. Energy Energy – the ability to do work the ability to cause change measured in joules symbol: [as in.. E = mc 2 ] E

Kinetic EnergyKinetic Energy – released by an object by its

motiondepends on the mass and speed of an

objectKE = ½ * mass * velocity2

KE = ½ m v2

Page 10: Unit 5 – Lecture 1. Energy Energy – the ability to do work the ability to cause change measured in joules symbol: [as in.. E = mc 2 ] E

Kinetic EnergyKinetic Energy – released by an object by its

motionSo…what’s the unit?

KE = ½ * mass * velocity2

KE = (kg) * (m2/s2)KE = Joules

Page 11: Unit 5 – Lecture 1. Energy Energy – the ability to do work the ability to cause change measured in joules symbol: [as in.. E = mc 2 ] E
Page 12: Unit 5 – Lecture 1. Energy Energy – the ability to do work the ability to cause change measured in joules symbol: [as in.. E = mc 2 ] E

Potential or Kinetic Energy?a bowling ball rolling down a lanea sandwich a ball being thrown in the air in a projectile

patha gallon of gasolinea car batterya lawnmower mowing the lawna moving baseball


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Emergence of WBG Based Power Electronics and System Level ... - OE... · Energy CV ' 2 2 1 Energy _density o r E & HH Capacitance Voltage Joules Permittivity Electric Field Joules

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FLUID MECHANICS 203 TUTORIAL No.2 … the basic relationship between pressure, ... P.E/m. = gz Joules/kg K.E./m = ½ u2 Joules/kg ENERGY HEAD If the energy terms are divided by the

Mechanicaal Energyal Energy, Work and Powerhealth.uottawa.ca/biomech/courses/apa4311/energy_c.pdf · Ene • Ability to do work • Measured in joulesMeasured in joules • One joule