Crystal P. LaVoie
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Across
3. rate at which work is done
5. the amount of matter an object has
10. energy is neither created nor destroyed, but is converted from one form to another
11. a measurement used to quantify hot and cold; related to the average motion of particles of an object
12. a reaction in which a carbon-containing substance combines with oxygen to release a large amount of energy in the form of heat and light
13. the attractive force that exists between any two objects that have mass
14. energy of position
15. movement from one place to another over time
16. the force times the distance moved in the direction of the force Down
Appendix D (page 2 of 3)
1. the branch of physics concerned with the conversion of different forms of energy
2. when energy is changed from one form into another
4. the ratio of the work output to the energy input
5. a machine that produces motion or power for doing work at the expense of some other form of energy
6. a work machine that converts energy in a chemical form to mechanical force and motion for the performance of work
7. a flow of thermal energy from one object to another object due to a temperature difference
8. energy of motion
9. the ability to do work
Appendix D (page 3 of 3)
w f y a p i z z y a y a c b r r a u c y s a u q y
f s g d v o d l a w r t r n g o v p g u y u l h w
i c m q c b g r z q p y p w n l p r n p d z f g i
i m x l c g s u t i k c g j a d e w c y b d k g w
x z z k f l t b w w m n w n w n v e y r g m o s x
k c f l g t d b g j o e b r e a y i w q w k j f b
k u x o q j q c a h n i v l y f u n t n w k u l d
p k h v f t z c o i o c a p i c s d t g u m k r w
q t b i l d y w g n i i b a k z o t x c d w b r o
i v d f r y i n t d t f m n b j b m b u p o f p l
f u m e e w e l a n a f o v x q j u b h e f d r t
k r e r u t a r e p m e t p j o w o e u d e w v u
s a i r a f r t h e r m o d y n a m i c s f e c n
r a t b t c o y a k o n r g n z v k p t q t w u m
y t w n d p o w e r f j r s e b l h e v v d i z x
s s u z z l g n v w s e r d s v a j m u a f p o h
u a y l j s b o s r n z o k o n y p d l h g g g n
y u p o h e i q d e a h a v f n m g p q k w z c q
t r d g q c v m c p r q m c s c h f z i e d z q u
x w w d h v x i x p t v b s b d a o l m u e w o s
f s g o e a t k e d u b a o j l o y r k d b w f r
n o i s r e v n o c o m f t v b f l a k r p d d h
r j j x n k p p f k g r a v i t y u h m w a b z z
y u u i y a t s n h u g s n u o l t z b d p a n f
c k k y f k y b v t j t h h l r n g j l e p a r g
combustion temperature
conservation speed
conversion work
efficiency transformation
energy power
engine potential energy
gravity thermodynamics
heat motor
kinetic energy mass
Puzzles are courtesy of PuzzleMaker.com.
Appendix F (3) (page 1 of 2)
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1. A 60.0 kg person walks from the ground to the roof of a 74.8 meter tall building. How much gravitational potential energy does she have at the top of the building?
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2. A pitcher throws a 0.145 kg baseball at a velocity of 30.0 m/s. How much kinetic energy does the ball have?
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3. A 0.15 kg ball is thrown into the air and rises to a height of 20.0 meters. How much kinetic energy did the ball initially have?
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4. A 125 g steel ball with a kinetic energy of 0.25 Joules rolls along a horizontal track. How high up an inclined track will the ball roll if friction is ignored?
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5. At a construction site, a 1.50 kg brick is dropped from rest and hits the ground at a speed of 26.0 m/s. Assuming air resistance can be ignored, calculate the gravitational potential energy of the brick before it was dropped.
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6. A soccer ball is kicked from the ground into the air. Describe two graphs that show how the PE and KE change between the time the ball is kicked and when it lands. (hint: make time the x axis).
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7. When a falling object reaches a speed called terminal velocity, its speed not longer increases. The object is losing gravitational potential energy but not gaining kinetic energy. Since energy must be conserved, where must the gravitational potential energys be going?
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8. Suppose a 200.0 kg dolphin is lifted in the air to be placed into an aquarium tank. How much energy is needed to lift the dolphin 3.0 meters into the air?
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9. A small meteoric is approaching earth. It has a mss of 100.0 kg and a speed of 10.0 km.s. How much kinetic energy does the meteoroid have? (hint: 1km=1000m)
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10. A 0.15 kg ball is dropped from the top of a 150 m building. What is the kinetic energy of the ball when it passes the 16th floor at a height of 63 m?
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11. Using mass in kg, velocity in m/s, and height in m, show that the formulas for kinetic energy and gravitational potential energy result in energy values with the same units. What is the energy unit called.
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Appendix F (page 2 of 2)
Questions 12-14 refer to the following table
Object Mass (kg) Initial upward speed (m/s) Initial height above ground (m)
Ball 1 1.00 8.00 15.00
Ball 2
2.00 1.00 10.00
Ball 3
3.00 4.00 5.00
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12. How much kinetic energy does each ball have when it is thrown?
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13. Which ball has the greatest gravitational potential energy when it reaches its maximum height? (hint: find the total energy for each ball.)
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14. Which ball hits the ground with the most kinetic energy?
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