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Name Period Date Energy Worksheet 2 Energy Transfer and Storage For each situation shown below: 1. Show your choice of system, unless it is specified for you. **Always include the Earth in your system. 2. Decide if your system is frictionless or not, and state this. 3. Sketch an energy bar graph for the initial situation. 4. Then complete the analysis with final internal energy bar graphs and energy flow diagram. 1. System = ______________________ Friction? Initial Ek Eg Ee Energy Flow Diagram Final E k Eg Ee E d i s s Final 0 Initial 0 2. System = ______________________ Friction? Initial Ek Eg Ee Energy Flow Diagram Ek Fina l Eg Ee E d i s s Ek Final Eg Ee E d i s s Final Initial 0 0 3. A car rolls to a stop while moving up a hill. System = ______________________ Initial Ek Eg Ee vf = 0 yf > 0 Energy Flo w Diagram vi>0 yi=0 0 0 Energy WS 2 page 2 4. A person pushes a car, with the parking brake on, up a hill. System = ______________________ yyff >>00 vvff == 00 y yi = 0 vi = 0 Initial Ek Eg Ee Energy Flow Diagram Ek Fina l Eg Ee E d i s s 0 0 0 5. A load of bricks rests on a tightly coiled spring, and then is launched into the air. System = ______________________ y Initial Ek Eg Ee vf Final yi = 0 vi = 0 0 Energy Flow Diagram Ek 0 Final Eg Ee E d i s s 0 Initial 6. A crate is propelled up a hill by a tightly coiled spring. System = ______________________ y vf > 0 yi = 0 vi = 0 0 Initial Initial Ek Eg Ee Friction? ____ Energy Flow Diagram Ek Final 0 0 Final Eg Ee E d i s s Energy WS 2 page 3 7. A bungee jumper falls off the platform and reaches the limit of stretch of the cord. System = ______________________ y Initial Ek Eg Ee 0 Initial Final Energy Flow Diagram Ek vf = 0 0 a Final Eg Ee E d i s s 0 8. An elevator, initially moving downward, is brought gently to rest on the ground floor. System = Elevator Car, Earth (not the motor!) motor system boundary y Initial yi > 0 Ek Eg Ee vi > 0 0 yf = 0 vf = 0 Energy Flow Diagram 0 Ek Fina l Eg Ee E d i s s 0 9. A car skids from a high speed to a stop with its brakes applied. The initial state is the car traveling at a high speed and the final state is the car at rest. System = ______________________ Initial Ek Eg Ee 0 Energy Flo w Diag ram Final E k Eg Ee E d i s s 0 Energy WS 2 page 4 10. Ben Laborin applies a force to push a crate from the bottom of an inclined plane to the top at a constant speed. The initial state is the crate in motion at the bottom of the hill and the final state is the crate in motion at the top of the hill. Ignore frictional effects. System = ______________________ Initial Ek Eg Ee Energy Flo w Diag ram 0 Final E k Eg Ee E d i s s 0 11. A moving cross-country skier skis from the top of a hill down into a valley and up a second smaller hill. The initial state is the skier in motion on top of the first hill and the final state is the skier in motion on top the second hill. Ignore the effect of friction and air resistance. System = ______________________ Initial Ek Eg Ee Energy Flo w Diag ram 0 Final E k Eg Ee E d i s s 0 12. Create your own, school appropriate, situation and construct corresponding energy bar graphs and energy flow diagram. Try to create a situation in which work is done! System = ______________________ Initial Ek Eg Ee 0 Energy Flo w Diag ram Ek 0 Final Eg Ee E d i s s