Mechanical Energy. Energy and Power Energy could be in the form of heat or work Heat is thermal...

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Mechanical Energy

Transcript of Mechanical Energy. Energy and Power Energy could be in the form of heat or work Heat is thermal...

Page 1: Mechanical Energy. Energy and Power Energy could be in the form of heat or work Heat is thermal energy Work is mechanical energy Power is the rate at.

Mechanical Energy

Page 2: Mechanical Energy. Energy and Power Energy could be in the form of heat or work Heat is thermal energy Work is mechanical energy Power is the rate at.

Energy and Power Energy could be in the form of

heat or work Heat is thermal energy Work is mechanical energy

Power is the rate at which work is performed

t

WP

Page 3: Mechanical Energy. Energy and Power Energy could be in the form of heat or work Heat is thermal energy Work is mechanical energy Power is the rate at.

Units SI vs. US System of units

(m, kg, s) vs. (ft, lb, s) Force (N)

Energy (1 N.m = 1 J) 1 kJ = 1,000 J; 1 MJ=1,000,000 J Also expressed as barrel of oil, Quad, eV

Power (1 J/s= 1 W) 1 kW = 1,000 W; 1 MW=106 W; 1 GW=109 W Also expressed as horsepower, BTU/hr

Page 4: Mechanical Energy. Energy and Power Energy could be in the form of heat or work Heat is thermal energy Work is mechanical energy Power is the rate at.

Units Convention Dr. Newton, Mr. Joule 235 newtons, 500

kilojoules, 10 kilograms 235 N, 500 kJ, 10 kg

1 mg= 0.001 g 1 kg=1000 g 1 Mg=1 metric ton

Power of ten notations

Prefix Symbol

10-12 pico p

10-9 nano n

10-6 micro

10-3 mili m

103 kilo k

106 Mega (million)

M

109 Giga (billion) G

1012 Tera (trillion) T

1015 Peta P

1018 Exa E

Page 5: Mechanical Energy. Energy and Power Energy could be in the form of heat or work Heat is thermal energy Work is mechanical energy Power is the rate at.

Types of Mechanical Energy Hydroelectric Tides Waves Wind

Page 6: Mechanical Energy. Energy and Power Energy could be in the form of heat or work Heat is thermal energy Work is mechanical energy Power is the rate at.

The Golden Rule of Mechanics

Whatever you lose in power you gain in displacement.

Output work can never be as much as input work

The main purpose of machines is to reduce the force (effort) required to do a particular job

Page 7: Mechanical Energy. Energy and Power Energy could be in the form of heat or work Heat is thermal energy Work is mechanical energy Power is the rate at.

Simple Machines

1. Ramp 2. Wedge 3. Screw

4. Lever 5. Wheel 6. Pulley

Page 8: Mechanical Energy. Energy and Power Energy could be in the form of heat or work Heat is thermal energy Work is mechanical energy Power is the rate at.

First Class LeversFulcrum is between the force and weight.

• Pliers

• Seesaw

• Scissors

Page 9: Mechanical Energy. Energy and Power Energy could be in the form of heat or work Heat is thermal energy Work is mechanical energy Power is the rate at.

Second Class LeversWeight is between the fulcrum and the force.

• Nutcracker

•Wheelbarrow

Page 10: Mechanical Energy. Energy and Power Energy could be in the form of heat or work Heat is thermal energy Work is mechanical energy Power is the rate at.

Third Class LeversForce is between the fulcrum and weight.

• Baseball bat

• Shovel

• Tongs


Unit 2: Energy Key Ideas · is changed to heat energy. When coal is burned, its stored chemical energy is changed to heat energy. Then the heat energy may be changed to mechanical

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Lesson 7. mechanical power is produced by a heat engine that transforms thermal energy (from combustion of a fuel) into rotational energy heat (generated.

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MECHANICAL & ENERGY ENGINEERING€¦ · sub-discipline of heat transfer within mechanical and energy systems. The area of clean energy and the environment, however, is much more inter-disciplinary

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