7TH GRADE PRACTICE
Physics Problems: Pressure, Grade 7
Pressure of solids, liquids, gases and hydraulic devices.
Here the conditions and analysis of the solution can be read without an account. In the simulator, you need to collect the same analyzes yourself: “Given,” formulas, order of steps and answer.
Problem statements
The answer options are there to check against, and the walkthrough opens under each problem.
Problem #34
Solid pressure and Pascal's lawEvaluate the statement: Gas pressure arises due to the impacts of continuously moving particles on the walls of the container.
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As the volume decreases, the frequency of impacts may increase, so the gas acts more strongly on each unit of wall area.
Answer
Problem #35
Solid pressure and Pascal's lawEvaluate the statement: The concept “Pressure of a solid” means: The pressure exerted on a liquid or gas is transmitted without change in all directions.
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Wide skis reduce pressure on the snow, while a sharp blade increases pressure for the same amount of force applied.
Answer
Problem #36
PressureThe machine presses on the floor with a force of 600 N through a support with an area of 0.03 m². What pressure does it create?
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Answer
Problem #37
Hydrostatic pressure and blood vesselsEvaluate the statement: The pressure of a fluid at rest, created by the weight of the layers above and increasing with depth.
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At the same depth in a homogeneous liquid, the pressure is the same and does not depend on the shape of the vessel.
Answer
Problem #38
Hydrostatic pressure and blood vesselsEvaluate the statement: the concept of “Communicating vessels” means: The pressure gauge compares the pressure with a reference value based on the difference in levels or deformation of the sensing element.
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Levels of the same liquid are set at the same height if the pressure above both surfaces is the same.
Answer
Problem #39
HydrostaticsFind the pressure of the water column at a depth of 2 m. The density of water is 1000 kg/m³, the acceleration of gravity is 9.8 m/s².
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Answer
Problem #40
Atmospheric pressure and hydraulicsEvaluate the statement: The pressure that atmospheric air exerts on bodies due to its weight and the movement of molecules.
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With height, the column of air above the observer decreases, so the barometer reading usually becomes lower.
Answer
Problem #41
Atmospheric pressure and hydraulicsEvaluate the statement: the concept “Experiment with a column of mercury” means: A device that transmits pressure by a liquid and gains strength due to the difference in the areas of the pistons.
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The barometer uses this principle directly or transmits pressure through the deformation of a sealed metal box.
Answer
Problem #42
HydraulicsA force of 120 N acts on a piston with an area of 0.003 m². The area of the second piston is 0.06 m². Find the force on the second piston without taking into account losses.
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Answer
The theory behind these problems
Work through the topic if a problem will not give in.
Formulas by topic
Look up symbols and units of measurement in the reference.