Preview

1
Forces in Fluids
Chapter 7
Preview
CRCT Preparation
2
CRCT Preparation
Chapter 7
1. The information in the table above was
collected during a laboratory investigation on
different fluids. According to this information,
which of the following conclusions is true?
A Gasoline, mercury, and rubbing alcohol will
float in water. B Gasoline, rubbing alcohol, and
water will float in mercury. C Mercury, rubbing
alcohol, and water will float in gasoline. D
Gasoline, mercury, and water will float in
rubbing alcohol.
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CRCT Preparation
Chapter 7
1. The information in the table above was
collected during a laboratory investigation on
different fluids. According to this information,
which of the following conclusions is true?
A Gasoline, mercury, and rubbing alcohol will
float in water. B Gasoline, rubbing alcohol, and
water will float in mercury. C Mercury, rubbing
alcohol, and water will float in gasoline. D
Gasoline, mercury, and water will float in
rubbing alcohol.
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CRCT Preparation
Chapter 7
2. A rock weighs 30 N. It displaces a volume of
water that weighs 5 N. What is the buoyant force
on the object? A 5 N B 6 N C 30 N D 35 N
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CRCT Preparation
Chapter 7
2. A rock weighs 30 N. It displaces a volume of
water that weighs 5 N. What is the buoyant force
on the object? A 5 N B 6 N C 30 N D 35 N
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CRCT Preparation
Chapter 7
3. Leon did an experiment to determine what would
happen to a rubber ball that he placed
underwater. Leon held the ball under 10 cm of
water in his kitchen sink. When he released the
ball, it rose to the surface. What inference can
Leon make based on his observations of the balls
movement? A The buoyant force acting on the ball
was greater than the force of gravity acting on
the ball. B The force of gravity acting on the
ball was greater than the buoyant force acting on
the ball. C The buoyant force acting on the ball
was equal to the force of gravity acting on the
ball. D There was no force of gravity acting on
the ball.
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CRCT Preparation
Chapter 7
3. Leon did an experiment to determine what would
happen to a rubber ball that he placed
underwater. Leon held the ball under 10 cm of
water in his kitchen sink. When he released the
ball, it rose to the surface. What inference can
Leon make based on his observations of the balls
movement? A The buoyant force acting on the ball
was greater than the force of gravity acting on
the ball. B The force of gravity acting on the
ball was greater than the buoyant force acting on
the ball. C The buoyant force acting on the ball
was equal to the force of gravity acting on the
ball. D There was no force of gravity acting on
the ball.
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CRCT Preparation
Chapter 7
4. Which of the following accurately describes
the forces acting on a beach ball that is at rest
on the surface of the water in a swimming
pool? A The forces are unbalanced. B The forces
are balanced. C No forces are acting on the
ball. D All of the forces are acting in the same
direction.
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CRCT Preparation
Chapter 7
4. Which of the following accurately describes
the forces acting on a beach ball that is at rest
on the surface of the water in a swimming
pool? A The forces are unbalanced. B The forces
are balanced. C No forces are acting on the
ball. D All of the forces are acting in the same
direction.
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CRCT Preparation
Chapter 7
5. The table shows mass and volume measurements
for four objects. Which of these objects will
float in water, given that the density of liquid
water is 1 g/cm3? A object 1 B object 2 C object
3 D object 4
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CRCT Preparation
Chapter 7
5. The table shows mass and volume measurements
for four objects. Which of these objects will
float in water, given that the density of liquid
water is 1 g/cm3? A object 1 B object 2 C object
3 D object 4
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CRCT Preparation
Chapter 7
6. In which of the following situations are there
unbalanced forces? A A submarine rises to the
surface as crewmembers empty the ballast
tanks. B A shipwreck lies undisturbed on the
bottom of the ocean. C Two children paddle a
canoe in opposite directions, but the canoe does
not move. D A fish floats just below the surface,
suspended in the water.
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CRCT Preparation
Chapter 7
6. In which of the following situations are there
unbalanced forces? A A submarine rises to the
surface as crewmembers empty the ballast
tanks. B A shipwreck lies undisturbed on the
bottom of the ocean. C Two children paddle a
canoe in opposite directions, but the canoe does
not move. D A fish floats just below the surface,
suspended in the water.
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CRCT Preparation
Chapter 7
7. Which of the following statements accurately
explains why a steel boat can float in
water? A Steel is denser than water. B Steel is
less dense than water. C The boat displaces a
volume of water that weighs less than the
boat. D The buoyant force acting on the boat is
equal to the weight of the boat.
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CRCT Preparation
Chapter 7
7. Which of the following statements accurately
explains why a steel boat can float in
water? A Steel is denser than water. B Steel is
less dense than water. C The boat displaces a
volume of water that weighs less than the
boat. D The buoyant force acting on the boat is
equal to the weight of the boat.
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CRCT Preparation
Chapter 7
8. Many power tools and power lifts have
pneumatic parts that use high-pressure air to
move things. Like hydraulic devices, these
pneumatic devices use an enclosed fluid to
transmit force. While a hydraulic device uses a
liquid, a pneumatic device uses a gas. How does
Pascals principle apply to pneumatic devices?
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CRCT Preparation
Chapter 7
8. Answer According to Pascals principle, a
change in pressure at any point in an enclosed
fluid will be transmitted equally to all parts of
that fluid. The enclosed fluid in a pneumatic
device is air.
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CRCT Preparation
Chapter 7
9. A ships hollow shape allows it to float in
water. Why does the same ship, when filled with
water, sink in water?
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CRCT Preparation
Chapter 7
9. Answer The combined weight of the ship and
the water that fills it is greater than the
weight of the water the filled ship displaces.
When an object displaces a volume of water that
has less weight than the object has, the object
will sink.