Template
Name
Date Pd
Unit VII: Worksheet 3a (Ei + ΔE = Ef)
For each situation shown below:
1. Show your choice of system in the energy flow diagram, 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 by showing energy transfers and the final energy bar graph.
1.
2.
3.
4. A person pushes a car, with the parking brake on, up a hill. (person not in system)
5. A load of bricks rests on a tightly coiled spring, then is launched into the air.
6. A crate is propelled up a hill by a tightly coiled spring.
7. A bungee jumper falls off the platform and reaches the limit of stretch of the cord.
8. An elevator, initially moving downward, is brought to rest on the ground floor.
9. Create your own situation and construct corresponding energy bar graphs and system schema.
System = ______________________
-----------------------
Edis
Eel
Eg
EK
Final
0
Eg
Initial
Eel
EK
0
Energy Flow
Diagram
yo>0
vo>0
y = 0
v = 0
system
boundary
0
y
Edis
Eel
Eg
EK
Final
0
Eg
Initial
Eel
EK
0
Energy Flow
Diagram
v = 0
Initial
0
y
Final
Edis
Eel
Eg
EK
Final
0
Eg
Initial
Eel
EK
0
Energy Flow
Diagram
Edis
Eel
Eg
EK
Final
0
Eg
Initial
Eel
EK
0
Energy Flow
Diagram
vo=0
yo=0
Final
v>0
0
y
0
Friction present
”E= 0 J
ΔE= 0 J
Friction present
ΔE= 0 J
vo=0
yo=0
Frictionless
ΔE= 0 J
vo=0
yo=0
v = 0
y > 0
frictionless
0
y
Edis
Eel
Initial
Eg
EK
Final
0
Eg
Initial
Eel
EK
0
Energy Flow
Diagram
Initial
Final
y
v>0
Friction present
ΔE≠ 0 J
Friction present
ΔE= 0 J
Final
Initial
Edis
Eel
Eg
EK
Final
0
Eg
Initial
Eel
EK
0
Energy Flow
Diagram
vo>0
yo=0
v = 0
y > 0
0
y
Edis
ΔE= 0 J
ΔE= 0 J
Edis
Eel
Eg
EK
Final
0
Eg
Initial
Eel
EK
0
Energy Flow
Diagram
Final
frictionless
Edis
Eel
Eg
EK
Final
0
Eg
Initial
Eel
EK
0
Energy Flow
Diagram
Eel
Eg
EK
Final
0
Eg
Initial
Eel
EK
0
Energy Flow
Diagram
Friction present
ΔE≠ 0 J
-3 units
+4 units
................
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