Work energy and power
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Work, Energy, and Power. Work = W. The product of the force F applied to an object over a distance d in which the object travels as a result of the force. (Force and distance must be parallel to each other). Joule (J) is the base unit of work. Work Example.

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Work, Energy, and Power

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Work energy and power

Work, Energy, and Power

Work w

Work = W

The product of the force F applied to an object over a distance d in which the object travels as a result of the force

(Force and distance must be parallel to each other)

Joule (J) is the base unit of work

Work example

Work Example

A student lifts a 50 pound (lb) ball 4 feet (ft) in 5 seconds (s).

How many joules of work did the student complete?

Convert English units to SI units

Solve for Work



Ability to do work

Light, heat, mechanical, chemical, and electrical forms of energy can all be used to exert a force for a distance.

Fuel cell

Roller coaster

NASA solar sail

Forms of energy

Forms of Energy

Potential Energy (Stored energy, usually referring to gravitational energy)

The capacity to do work by virtue of position or configuration

Forms of energy1

Forms of Energy

Kinetic Energy (Energy of motion)

Energy which a body possesses because of its motion, which occurs anywhere from an atomic level to that of a whole organism

Energy transformation

Energy Transformation


Radiant Chemical

Electrical  Thermal

Renewable energy sources

Renewable Energy Sources






Nonrenewable energy sources

Nonrenewable Energy Sources

Natural Gas




Conservation of energy

Conservation of Energy

Energy cannot be created or destroyed, but it can change from one form to another.

Energy Conversion

Changing one form of energy to another

Energy Efficiency: The ratio of the useful energy delivered by a dynamic system to the energy supplied to it

Entropy: The increasing disorder when energy is transformed to heat during conversion

Energy conversion

Energy Conversion


Fossil fuelsChemical→ Heat→ Mechanical→ Electrical

Solar cellsSunlight→Electrical

Wind turbinesKinetic→Mechanical→Electrical

HydroelectricGravitational potential→Mechanical→Electrical

NuclearNuclear →Heat→ Mechanical→Electrical

Vehicle System Conversion




Which output is desired, mechanical or heat?

What are current energy concerns

What Are Current Energy Concerns?






What roles do engineers have in energy?



Rate at which work is performed or energy is expended

Watt is the base unit of Power

One watt is equal to 1 joule of work per second

Types of power

Types of Power

Electrical Power

Uses electrical energy to do work


Uses mechanical energy to do work (linear, rotary)


Uses energy transferred by liquids (hydraulic) and gases (pneumatic)

Power example

Power Example

A student lifts a 50.0 pound (lbf) ball 4.00 feet (ft) in 5.00 seconds (s).

How many watts of power are used to lift the ball?

Work = 271.45 J



McGraw-Hill dictionary of engineering. (2nd ed.). New York, NY: McGraw-Hill.

Microsoft, Inc. (2008). Clip art. Retrieved January 10, 2008, from

National Aeronautics and Space Administration (NASA). (1997). Daedalus. Retrieved April 2, 2008, from /Photo/Daedalus/

U.S. Department of Energy. (2008). Scientific forms of energy. Retrieved March 23, 2008, from

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