Explain Kinetic Energy Changes
Middle School Science · Flashcards · Application
MIDDLE SCHOOL SCIENCE · FLASHCARDS
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QUESTION
Find the kinetic energy ratio if speed triples and mass stays constant:
K
E
2
K
E
1
=
?
\frac{KE_2}{KE_1}=?
K
E
1
K
E
2
=
?
QUESTION
Identify which evidence from a graph supports
K
E
∝
v
2
KE \propto v^2
K
E
∝
v
2
: doubling
v
v
v
makes
K
E
KE
K
E
quadruple or double?
QUESTION
Using
K
E
=
1
2
m
v
2
KE=\frac{1}{2}mv^2
K
E
=
2
1
m
v
2
, what is
K
E
KE
K
E
for
m
=
2
m=2
m
=
2
and
v
=
3
v=3
v
=
3
(no units)?
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ANSWER
9
9
9
.
K
E
=
1
2
(
2
)
(
3
)
2
=
1
2
(
2
)
(
9
)
=
9
KE = \frac{1}{2}(2)(3)^2 = \frac{1}{2}(2)(9) = 9
K
E
=
2
1
(
2
)
(
3
)
2
=
2
1
(
2
)
(
9
)
=
9
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