Track Energy Changes
Middle School Science · Flashcards · Application
MIDDLE SCHOOL SCIENCE · FLASHCARDS
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QUESTION
Which energy change best matches a stretched rubber band released: elastic potential decreases, kinetic increases?
QUESTION
Find the missing value in a closed system: before
E
k
=
6
J
E_k = 6\text{ J}
E
k
=
6
J
and
E
g
=
4
J
E_g = 4\text{ J}
E
g
=
4
J
; after
E
g
=
1
J
E_g = 1\text{ J}
E
g
=
1
J
, so
E
k
=
E_k =
E
k
=
?
QUESTION
Find
E
g
E_g
E
g
change: A
2
kg
2\,\text{kg}
2
kg
object drops
3
m
3\,\text{m}
3
m
with
g
=
10
m/s
2
g=10\,\text{m/s}^2
g
=
10
m/s
2
; what is
Δ
E
g
\Delta E_g
Δ
E
g
?
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ANSWER
Δ
E
g
=
−
60
J
\Delta E_g = -60\,\text{J}
Δ
E
g
=
−
60
J
. Use
Δ
E
g
=
m
g
Δ
h
=
2
×
10
×
(
−
3
)
\Delta E_g = mg\Delta h = 2 \times 10 \times (-3)
Δ
E
g
=
m
g
Δ
h
=
2
×
10
×
(
−
3
)
.
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