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What is work? Is what you’re doing now work? Do I get paid for work? Is my definition of work different than the Physics definition of work?

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Work involves Force The more force that is applied the more work is done.

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**Work Involves Distance**

The more distance traveled the more work is done.

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So Work Is… Force acting upon an object in the direction the object moves.

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**Two conditions must be met for work to be done:**

1. The object MUST move. No move, no work. 2. A force must act on the object in the direction the object moves.

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Is doing pull-ups?

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Is Sitting in your Desk?

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Is pumping Gas?

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**Is Carrying a box? Applied force Direction of movement**

Once the box is moving, no force is necessary to keep it moving!

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**What two conditions must be met?**

So… W = F * d

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**W (15N) (10m) = * W = 150 Let Practice! W = F * d N * m Joule (J)**

Rita mows lawns on the weekends. If she uses 15 N of force to move a lawn mower a distance of 10 meters, how much work does Rita do? W = F * d W (15N) (10m) = * W = 150 N * m or Joule (J) What are the units?

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**So what’s this energy buinsess and how does work fit in?**

Energy- is the ability to do work Potential Kinetic

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Potential Energy The energy an object has by virtue of its position in a gravitational field. The higher an object above the ground the more potential energy.

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Kinetic Energy Energy of Motion

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**We Simply Have to Remember…**

Energy is conserved You can’t make it You can’t destroy it You can only change it from one form to another!

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**This Is The “No Free Lunch” Principle**

You never get somthin’ fer nuthin’ $$$$$$$$$$$$$$$$$ This is also true for Energy

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PE PE PE KE KE PE KE KE .

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