What is wrong with this Energy Diagram?

What is Work? Energy transfer or transformation Work is done when a force causes a change in the motion of an object in the direction of the force.

What is the work equation? Work = Force X Distance  Force is measured in Newtons (N)  Work is measured in Joules (J)  Distance meter (M)

Magic triangle for the work equation W FD

What happens if you increase the stopping distance? The Force of the impact decreases Work =D F

What happens when you decrease the stopping distance? The Force of the impact increases Work = D F

Work Practice How much work is done in pushing a chair 12m across the floor using a force of 300N? A=3600 J 25 N are needed to lift up a bowling ball 0.75 m off the floor. Determine the work done on the ball. A= J

USING GRAPHICAL REPRESENTATIONS TO COMMUNICATE THE ENERGY FLOW IN A SYSTEM. Energy Diagrams & Energy Chains

Energy Diagrams Energy Diagrams show the flow of energy in a small piece of an energy chain. The energy diagram is also much more quantitative.

Energy Diagrams Let’s use a skidding car as our example.

Using Font Size The size of the font can signal the relative amount of energy in a specific form and how it changes over time.

Using Bar Graphs - Bar graphs can show how energy flows in a system. Each bar represents a form of energy. The height of the bar signals the amount of energy at that time. - In some cases a standard bar graph is used, but a composite bar graph can be used to illustrate the flow of energy.

Standard Bar Graph

Composite Bar Graph

Using Circle Graphs Circle graphs can be used to illustrate energy flow. Each form is represented by a portion of the circle. Multiple circle graphs can illustrate how the amount of energy in each form changes over time.

Circle Graph

Skatepark Interactive Get a computer and Log-in Open up Google and type in PHET skatepark simulation The second bullet should say Energy Skate Park- PHET  Click it! It will ask do you want to open or save the file Click OPEN Follow the instruction on your handout- DO NOT PLAY!! When you are done if there is time permitting you may play with the simulation