Lesson: Pascal's Principle

In this lesson, we will learn how to use Pascal's principle to analyze the magnitude and direction of fluid pressure on an object.

Sample Question Videos

  • 02:11

Worksheet: 7 Questions • 1 Video

Q1:

A tall and thin water container has holes in its side at different heights above the ground, as shown in the diagram. Water leaks from the holes in the container and only the leak from hole ๐ด is shown. The leaks from the different holes travel different distances sideways from the water container. From which hole would the water travel farthest away from the container?

Q2:

A container that is 1.2 m under the sea, near the shore, is full of water of density 1 0 2 0 kg/m3. The container is suspended above the sea bed on a pole. The container is 3.5 m in height. Water can enter and leave the container through three holes in its walls and one hole in its base, as shown in the diagram. Water pressure is increased gradually at one of the holes in the walls until the pressure there is 7 5 0 0 Pa.

Is the pressure ๐‘ƒ 1 greater than, less than, or equal to 7 5 0 0 Pa?

Is the pressure ๐‘ƒ 2 greater than, less than, or equal to 7 5 0 0 Pa?

Is the pressure ๐‘ƒ 3 greater than, less than, or equal to 7 5 0 0 Pa?

Q3:

Water in a container is pushed horizontally by a movable wall of the container, as shown in the diagram. The movable wall has sides of length ๐ฟ = 0 . 2 5 2 m and ๐ฟ = 0 . 7 5 3 m . Within the water in the container is a square metal sheet with sides of length 0.125 m. The sheet is supported by a pole so that all of its downward-facing surface is in contact with the liquid apart from a small area that the pole fits through. The water pushes the sheet when the containerโ€™s movable wall is moved. The force applied to the movable wall is equal to the force applied to the water by the wall.

What is the magnitude of the force due to the motion of the movable wall that pushes upward on the downward-facing surface of the metal sheet? Ignore the area of the hole where the pole passes through the sheet.

What is the magnitude of the force due to the motion of the movable wall that pushes downward on the upward-facing surface of the metal sheet? Ignore the area of the hole where the pole passes through the sheet.

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