Basic Physics Flashcards
What is meant by matter?
Anything that occupies space
What are three basic physical states in which matter can exist?
Solid, liquid and gas
What is meant by pressure?
Force that acts on a unit of area
What is the standard sea level atmospheric pressure expressed in inches of mercury, and in pounds per square inches?
29.92 inches of mercury and 14.69 pounds per square inch.
What characteristic of the atmosphere determines the speed of sound?
Its temperature
What is meant by the density of air?
The weight of a given volume of air
How much force is produced by 1000 psi of hydraulic pressure acting on a piston whose area is 20 square inches?
20,000 psi
What is meant by the fulcrum of a lever?
The point about which the lever rotates
Give an example of a first-class lever, a second class and a third class lever.
First class: A screwdriver being used to pry the lid from a can of paint.
Second class: A wheelbarrow
Third class: A hydraulically retracted landing gear
How many cubic inches of fluid is forced out of a cylinder by a piston whose area is 20 square inches when the piston moves 5 inches?
100 cubic inches
What is meant by a temperature of absolute zero?
The temperature at which all molecular movement stops.
What is the Celsius equivalent of a temperature of 50 degrees F?
10 degrees C
What formula is used to find the amount of work done when an object is moved across a floor?
Work= force x distance
What determines the mechanical advantage of an arrangement of ropes and pulleys?
The number of ropes that support the weight.
What determines the mechanical advantage of a gear train?
The ratio between the number on the drive gear and the number of teeth on the driven gear
