Energy Bar Graphs

Energy Bar Graphs

For each situation, sketch an energy bar graph for the initial situation (pt A) and the final situation (pt B). Y=0 implies no height and therefore your reference point for that particular problem.

B

1. Initial Final

compressed

spring

A

ref Ee Eg Ek Ee Eg Ek Ediss

Vo=0

2.

Initial Final

compressed B

spring

A

ref Ee Eg Ek Ee Eg Ek Ediss

Vo=0

3. A car rolls to a stop while moving up a hill.

Initial Final

y>0

v=0

y=0 B

v>0

A Ee Eg Ek Ee Eg Ek Ediss

4. 4. A person pushes a car, with the parking brake on, up a hill.

Initial Final

y>0

v=0

v=0

y=0 B

A Ee Eg Ek Ee Eg Ek Ediss

5. A pile of bricks rests on a tightly coiled spring, then is launched into the air.

B v>0 Initial Final

y=0

v=0 A

compressed relaxed Ee Eg Ek Ee Eg Ek Ediss

6. A crate is propelled up a hill by a tightly coiled spring.

v>0 Initial Final

v=0

y=0 B

A compressed Ee Eg Ek Ee Eg Ek Ediss

7. A bungee jumper falls off the platform and reaches the limit of stretch of the cord.

A Initial Final

ref v=0

B Ee Eg Ek Ee Eg Ek Ediss

8. An elevator, initially moving downward, is brought to a rest on the ground floor.

system boundary Initial Final

A y>0

v>0

B y=0

v=0 Ee Eg Ek Ee Eg Ek Ediss