Miscellaneous
What did the ability to alter the buoyancy of a vessel by adding or removing weight lead to the development of?
Submarine
Define 'pressure'
The force exerted per unit of area
Write the equation for pressure
Pressure = (Force)/(Area)
What is a machine that uses Pasal's Principle to multiply a force?
Hydraulic press (or Hydraulic device)
The four main factors that affect the drag on an object moving through a fluid are:
speed, shape, size, and fluid density
State Pascal's Principle
If pressure is applied to a fluid inside a closed container, the pressure increase will be distributed equally throughout the container.
Describe how a submarine achieves neutral buoyancy
Submarines use ballast tanks to change its overall density
What is the pressure of air that surrounds the earth?
Atmospheric pressure
Who is often credited for the discovery of air pressure?
Torricelli
Define 'altimeter'
A device used to measure altitude.
Using kinetic theory, list the three main states of matter.
Solid, liquids, gases
What are two main factors that affect gravitational pressure?
1.) Depth
2.) Density
Which two states of matter are fluids?
Liquids and gases
Define 'compressibility'
The ability to be easily squeezed and compacted into smaller containers.
Explain why surface tension occurs
The cohesive force between the molecules of a liquid causes the surface layer of a liquid to act like a stretched elastic sheet.
What is the scientific law that predicts the amount of buoyant force on a submerged or floating object?
Archimedes' Principle
State Charles' law
If the pressure of a gas is constant, its volume and temperature are directly proportional.
Define 'vacuum'
an empty space with no matter
What degree is absolute zero?
-273.15°C and/or 0 K
What is the SI unit of pressure?
pascal (Pa)