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Ninth Grade (Grade 9) Fluid Mechanics Questions

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Grade 9 Fluid Mechanics
An object with a mass of 20 kg displaces a volume of fluid that weighs 200 N when placed inside. Will the object float or sink in the fluid?
  1. Trick question! A 20 kg object cannot displace 200 N of a fluid
  2. It will sink due to gravity being stronger
  3. There is not enough information to answer this question
  4. It depends on the type of fluid
  5. It will float due to the buoyant force being stronger
Grade 9 Fluid Mechanics
Kameron increases the pressure of a gas being held at a constant volume in a metal cylinder. Which of the following could he expect to happen to the gas inside the cylinder?
  1. The molecules will collide less often with the walls of the cylinder
  2. The molecules will slow down
  3. The temperature will increase
  4. The gas will not change at all
  5. The temperature will decrease
Grade 9 Fluid Mechanics
Mahanna has a device which contains nitrogen gas. With it she can control the volume, temperature, and pressure of the gas. If she must keep one of those properties constant, which of the following CANNOT happen?
  1. The pressure and temperature increase while the volume stays constant
  2. The volume and temperature increase while the pressure stays constant
  3. The pressure and volume increase while the temperature stays constant
  4. The pressure increases but the temperature decreases while the volume stays constant
  5. The volume increases but the temperature decreases while the pressure stays constant
Grade 9 Fluid Mechanics
When an object is submerged in a liquid, the fluid pressure is always strongest:
  1. On the bottom of the object because it is deeper
  2. On the top of the object because it is heavier
  3. The pressure is equal all the way around the object
  4. When balanced by gravity
  5. On more dense objects
Grade 9 Fluid Mechanics
You open a cooler to get a soda on a hot summer day and notice a can of diet soda is floating while the cans of regular soda are not floating. What can you infer about this situation? Which is the best statement that describes why?
  1. The water must be flowing upward in the area of the diet soda.
  2. There must be less matter in the regular can of soda.
  3. The diet soda must have less mass per unit of volume than the surrounding water.
  4. The diet soda can must be made of a different kind of material.
Grade 9 Fluid Mechanics
Which one of the following substances will float in water? The density of water is 1.0g/cm.
  1. gold- density = 19.3 g/cm
  2. milk - density = 1.03 g/cm
  3. ice - density 0.92 g/cm
  4. b and c
Grade 9 Fluid Mechanics
A large truck passes a car on the highway. According to Bernoulli's principle, which of the following should occur?
  1. pressure decreases between the vehicles so the car and truck move slightly apart
  2. pressure decreases between the vehicles so the car and truck move slightly together
  3. pressure increases between the vehicles so the car and truck move slightly apart
  4. pressure increases between the vehicles so the car and truck move slightly together
Grade 9 Fluid Mechanics
Bernoulli's principle applies to                         .
  1. gases only
  2. liquids only
  3. both gases and liquids
  4. neither gases or liquids
Grade 9 Fluid Mechanics
Two tall buildings are separated by a narrow alleyway. On a windy day, wind gusts move very quickly through the alley. If the buildings are not constructed properly, which of the following could be a concern when this occurs?
  1. the buildings' windows could be blown outward into the alley because of air pressure differences
  2. the buildings' windows could be blown inward into the building because of air pressure differences
  3. the buildings' windows could be blown outward into the alley because of temperature differences
  4. the buildings' windows could be blown inward into the building because of temperature differences
Grade 9 Fluid Mechanics
Which of the following does Bernoulli's principle help to explain?
  1. why water expands when it freezes
  2. why umbrellas turn inside out on windy days
  3. why condensation occurs on a cold glass of lemonade
  4. why moving cars take longer to stop on ice than on dry pavement
Grade 9 Fluid Mechanics
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