Chapter 13: Liquids Flashcards
Water pressure is greatest against the
bottom of a submerged object.
The pressure in a liquid depends on liquid
depth and density.
The mass of a cubic meter of water is
1000 kg.
A completely submerged object always displaces its own
volume of fluid.
The reason a life jacket helps you float is
the density of both you and the jacket together is less than your density alone.
Compared to an empty ship, the same ship loaded with Styrofoam will float
lower in the water.
The attraction between molecules of the same kind is called
cohesion.
If 50 Newtons of force is added over a liquid with 1 m2 of surface area, how many Newtons of weight can be lifted by a hydraulic piston with a surface area of 100 m2?
5000 N
The pressure at the deepest point of a lake 10 m deep is about
100,000 N/m2.
Which has the most pressure at the bottom: a 15 m deep well with a diameter of 1 m, a tube of water 20 cm deep with a diameter 1 cm or a 5 m deep section of the ocean with a diameter of 1 km?
A 15 m deep well with a diameter of 1 m.
Pressure (def)
The ratio of force to the area over which that force is distributed:
Pressure = force / area
Liquid pressure = weight density x depth
Buoyant force (def)
The net upward force that a fluid exerts on an immersed object.
Archimedes’ principle
An immersed body is buoyed up by a force equal to the weight of the fluid it displaces.
Principle of flotation
A floating object displaces a weight of fluid equal to its own weight.
Pascal’s principle
The pressure applied to a motionless fluid confined in a container is transmitted undiminished throughout the fluid.
