Transcript Work Energy Power Review

Work Energy Power Review
Work is done when
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1. the displacement is not
zero and a force is
parallel to the
displacement
2. the displacement is
zero.
3. the force is zero.
4. the force and
displacement are
perpendicular.
Which of the following is an example
of mechanical energy?
1. Kinetic
2. Elastic Potential
3. Gravitational
Potential
4. All of the above
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A 75kg man and a 55kg woman perform
dives on adjacent diving boards of the
same height. Which of them will have a
greater kinetic energy entering the water?
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1. The man
2. The woman
3. Both will be the
same
4. Unable to be
determined
A 75kg man and a 55kg woman perform
dives on adjacent diving boards of the
same height. Which of them will have a
greater speed entering the water?
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1. The man
2. The woman
3. Both will be the
same
4. Unable to be
determined
If both the mass and the height of a ball are
doubled, the potential energy of the ball is
increased by a factor of
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27
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If both the mass and the velocity of a ball are
tripled, the kinetic energy of the ball is
increased by a factor of
3.
6.
9.
27.
Of the following examples, the one that
represents work as defined by a scientist is:
bo
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1. lifting a book from your
desk.
2. leaning on a shovel while
others labor.
3. pushing hard against a wall
for an hour.
4. carrying a heavy box on
your head.
Which of the following represents the
capacity to do work?
Power
Energy
Force
Acceleration
Velocity
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at
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A machine that does more work than
another must have moved the object
is a shorter amount of time?
1. True
2. False
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Which of the following represents the
rate that work is being done?
Power
Kinetic Energy
Potential Energy
Total Energy
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2.
3.
4.
A mouse and a raccoon race to the top of a
tree for the last morsel of food left before
winter. Both arrive at the top at the same
time. Which had more power?
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Sa
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Mouse
Raccoon
Same
Unable to be
determined
M
1.
2.
3.
4.
A linebacker pushes against the blocker but the
blocker does not move. The work is:
Positive
Negative
Zero
Not enough info
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When doing a bench press, you gradually raise
the bar. The work done by gravity is:
Positive
Negative
Zero
Not enough info
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When doing a bench press, you gradually lower
the bar down to your chest. The work done by
your arms is:
Positive
Negative
Zero
Not enough info
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Because your two-year old cousin refuses to
move, you pull him along the ground. The
work done by friction is:
Positive
Negative
Zero
Not enough info
A rolling wagon has 50 joules of kinetic energy. If the
wagon’s velocity is doubled, the kinetic energy of
the wagon:
1. is reduced to 25 joules.
2. is increased to 100
joules.
3. is increased to 200
joules.
4. remains the same.
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20
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In a closed system, what is constant?
Potential energy
Kinetic energy
Mechanical energy
All are constant
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2.
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Two rescue packages of equal mass are
dropped from planes of different altitude red plane at 1500m and a blue plane at
2500m. Which of them will have a greater
speed hitting land?
m
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be
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to
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Re
d
1. Red plane’s package
2. Blue plane’s package
3. Both will be the
same
4. Unable to be
determined