Name: ________________________________

Energy Transfer ModelThe front of each model packet should serve as a storehouse for things you’ll want to be able to quickly look up later. We will usually try to give you some direction on a useful way to organize this space (see the table below).

ENERGY “Cheat”sheetSymbol Flavor of Energy When is this energy stored? Equation Notes

System Schema

Physics! / Unit I / ETM

– 1 – from Modeling Workshop Project © 2006

Practice 1: Energy Pie ChartsINSTRUCTIONS: Use pie charts to analyze the energy changes in each situation given.• Designate your choice of system by explicitly listing the objects included.• Divide the pies in a qualitatively accurate fashion, and label them with the energy storage

mechanism involved.

1. A ball is held above the ground, and then is dropped so it falls straight down.! (Restrict your analysis to the ball moving in the air, BEFORE it hits the ground.)

System Schema Draw a pie chart for each positionDraw a pie chart for each positionDraw a pie chart for each position

System Schema Draw a pie chart for each positionDraw a pie chart for each positionDraw a pie chart for each position

2. A wind-up toy is wound up, then "walks" across a table and comes to a stop.

!

System Schema Draw a pie chart for each positionDraw a pie chart for each positionDraw a pie chart for each position

Physics! / Unit I / ETM

from Modeling Workshop Project © 2006 ! – 2 –

3. An object rests on a coiled spring, and is then launched upwards.

System SchemaDraw a pie chart for each

position

!

4. A piece of clay is dropped to the floor.

System SchemaDraw a pie chart for each

position

5. A truck is driven at constant speed down the street.

System Schema Draw a pie chart for each positionDraw a pie chart for each positionDraw a pie chart for each position

6. A cart is launched up a ramp by a spring.

System Schema Draw a pie chart for each positionDraw a pie chart for each positionDraw a pie chart for each position

Physics! / Unit I / ETM

– 3 – from Modeling Workshop Project © 2006

Practice 2: LOL Diagrams

7. A car on a frictionless roller coaster track, launched by a huge spring, makes it to the top of the loop.

Energy FlowDiagramK UsUg K Ug Us !Etherm

Initial FinalInitial Final

vv=0

Qualitative conservation equation:

8. Same as problem 6, but with the spring outside of the system.

Energy FlowDiagramK UsUg K Ug Us !Etherm

Initial FinalInitial Final

vv=0

Qualitative conservation equation:

9. Same as problem 6, but with friction between the cart and the track.

Energy FlowDiagramK UsUg K Ug Us !Etherm

Initial FinalInitial Final

vv=0

Qualitative conservation equation:

Physics! / Unit I / ETM

from Modeling Workshop Project © 2006 ! – 4 –

10. Same as problem 6, but we take our final snapshot earlier this time (the cart is only half-way up the loop).

Energy FlowDiagramK UsUg K Ug Us !Etherm

Initial FinalInitial Final

vv=0

Qualitative conservation equation:

11. A car, moving up a hill, coasts to a stop.

Energy FlowDiagramK UsUg K Ug Us !Etherm

Initial FinalInitial Final

v

v=0

Qualitative conservation equation:

12. A person pushes a stalled car to get it to the service station.

Energy FlowDiagramK UsUg K Ug Us !Etherm

Initial FinalInitial Final

vv=0

Qualitative conservation equation:

Physics! / Unit I / ETM

– 5 – from Modeling Workshop Project © 2006

13. A load of bricks, resting on a compressed spring, is launched into the air.

Energy FlowDiagramK UsUg K Ug Us !Etherm

Initial FinalInitial Final

v

v=0 y=0

Qualitative conservation equation:

14. Same as before, but with the spring outside of the system.

Energy FlowDiagramK UsUg K Ug Us !Etherm

Initial FinalInitial Final

v

v=0 y=0

Qualitative conservation equation:

15. Same as before, but with the y = 0 m line moved to the ceiling.

Energy FlowDiagramK UsUg K Ug Us !Etherm

Initial FinalInitial Final

v

v=0 y=0

Qualitative conservation equation:

Physics! / Unit I / ETM

from Modeling Workshop Project © 2006 ! – 6 –

16. Same as the previous page, but now draw an LOLOLOL (that is, draw an energy bar chart showing 4 distinct snapshots of your choosing). Bonus: Draw even more L’s by choosing additional distinct snapshots.

Qualitative conservation equation:

17. A cart is launched up a ramp by a spring.

Qualitative conservation equation:

18. Create your own situation.

Qualitative conservation equation:

Physics! / Unit I / ETM

– 7 – from Modeling Workshop Project © 2006

Experiment Outline: Quantifying Energy Flavors (K, Ug, & Us)

Sketch of the situation:

What can we measure? What tool can we use to measure it?

Objective:

Physics! / Unit I / ETM

from Modeling Workshop Project © 2006 ! – 8 –