PPT Slide

E-B

Grav.Field

E-B

down

When the mechanical system

isn’t isolated, there can be

other forces doing work on

the entire system

up

Earth-Ball system

E.g.

friction,

or anything

outside the

system as

it’s defined

-

+

Total Energy

is still

conserved,

we just have

to include

Wother too

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