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Chapter Review Questions
Standardized Test Practice
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Glass of Water
Pressure in all Directions
Buoyant Force and Shape
Floating and Density
Boat and Cube
Airplane Taking Off
Pushing on a Fluid
Pressure in a Moving Fluid
Chimneys and Bernoulli’s Principal
Make the following Foldable to help identify what you already know, what you want to know, and what you learned about science.
Fold one sheet of paper lengthwise.
Fold into thirds.
Unfold and draw overlapping ovals. Cut the top sheetalong the folds.
Label the ovals as shown.
Construct a Venn Diagram
As you read the chapter, list the characteristics of liquids under the left tab, those characteristics of gases under the right tab, and those characteristics common to both under the middle tab.
Why do objects float?
Why do objects float?
Doing Work with Fluids
Explain why a fire in your fireplace will smoke more strongly on a windy day.
The wind causes the pressure outside the chimney to be less than the pressure inside the house, thus drawing the smoke up and out faster.
Why does the cube in this illustration sink while the boat, which is larger, floats?
The boat displaces more water because of its shape. Therefore the boat floats, but the cube sinks.
Any object with a density greater than the fluid it’s placed in will _______.
The answer is sink. Conversely, any object with a density less than the fluid it’s placed in will float.
A ship will float when its _______ is great enough to make its density less than the water’s.
A. buoyant force
The answer is D. Anything less dense than water will float, no matter how massive it is.
Suppose you put a toy boat in a bathtub and find that it floats. Next you put in a lead block that is the exact same size and shape as the toy boat, but solid throughout. Why won’t it float?
The shape is only part of the reason. The lead block will sink because, though its volume would be the same as a floating boat’s, its density will be greater, and far greater than water’s density.
When you increase the surface area in contact with a fluid, you _______ the buoyant force on the object.
The answer is B. This is why a thin sheet of aluminum foil will float, but the same sheet balled up will sink.
During hurricanes or other high-wind events, windows in houses sometimes shatter _______.
The answer is C. Bernoulli’s principle states that pressure decreases with motion in a fluid. When the pressure inside the house is greater than the pressure outside, the windows may burst outward.
The first method for determining the buoyant force was discovered well over 2,000 years ago by a Greek man named ______.
The correct answer is A. This is why the principle is referred to as Archimedes principle.
Imagine you have a rock that weighs 1000 N with a volume of 10,000 cm3. You drop it into a tank and it sinks to the bottom. What is the exact volume of the water it displaces?
A. 1,000 cm3
B. 10,000 cm3
C. 100,000 cm3
D. 1,000,000 cm3
The answer is B. The volume of water displaced will be exactly equal to the volume of the rock.
Whose principle explains what is happening in this image?
The answer is D. A hydraulic system uses Pascal’s principle to make the output force applied on the large piston greater than the input force applied on the small piston.
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