Ch 9 notes
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Ch # 9 Notes . Work, Power, and Machines. Chapter 9.1 Notes. Work- quantity of energy transferred by a force when it is applied to a body and causes that body to move in the direction of the force. Has to move!!! Work = Force x Distance Work done is measured Joules (J).

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Ch # 9 Notes

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Ch 9 notes

Ch # 9 Notes

Work, Power, and Machines


Chapter 9 1 notes

Chapter 9.1 Notes

  • Work- quantity of energy transferred by a force when it is applied to a body and causes that body to move in the direction of the force. Has to move!!!

    Work = Force x Distance

    Work done is measured Joules (J)


Ch 9 notes

  • Power- a quantity that measures the rate at which work is done

    Power = Work/time

    Power is often measured in watts but horsepower is also a unit of power


Ch 9 notes

  • Mechanicaladvantage- (MA) a quantity that measures how much a machine multiplies force or distance

    Mech Ad = Output force / Input force

    Input distance / output distance


Chapter 9 2 notes

Chapter 9.2 notes

  • Simplemachines- one of the six basic types of machines of which all other machines are composed of.

    The six simple machines

  • Lever

  • Pulley

  • Wheel and axle

  • Inclined plane

  • Wedge

  • Screw


6 simple machines

6 simple machines

Wheel and Axle


Ch 9 notes

  • Compound machine- is a machine made of more than one simple machines.

  • A bike and a car are examples of compound machines.


Chapter 9 3 notes

Chapter 9.3 Notes

  • Potentialenergy- the stored energy resulting from the relative position of objects in a system.

    Gravitational potential energy equation

    gPE = mass x free-fall acceleration x height

    PE = mgh

    So the higher up or the bigger the mass the more PE


Ch 9 notes

  • Kineticenergy- the energy of a moving object due to its motion

    Kinetic energy equation

    KE = ½ x mass x velocity squared

    KE = ½ mv2

    So the faster an object moves the greater the KE


Ch 9 notes

  • Mechanicalenergy- is the sum of the kinetic and potential energy of a large scale system


Chapter 9 4 notes

Chapter 9.4 Notes

Top of hill has the greatest amount of PE

  • The law of conservation of energy states that energy cannot be created or destroyed.

  • Energy changes from potential energy to kinetic energy.

Bottom of hill has the greatest amount of KE


Work cited

Work Cited

  • “Six Simple Machines”. April 14, 2008. http://www.coolschool.ca/lor/SC9/unit16/U16L04/SimpleMachinesImages.jpg

  • “Wheel and Axle”. April 16, 2008. http://www.ed.uri.edu/SMART96/ELEMSC/SMARTmachines/images/logo.gif

  • “Roller Coaster”. April 17, 2008. http://z.about.com/d/travelwithkids/1/0/w/C/coaster_330.JPG


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