Physics Oral Flashcards
What is meant by matter?
Anything that occupies space and has weight
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 14.70 pounds per square inch.
What characteristics of the atmosphere determine the speed of sound?
Temperature and humidity
What is meant by the density of air?
The mass per unit volume of Earth’s atmosphere
How much force is produced by 1,000 psi of hydraulic pressure acting on a piston whose area is 20 square inches?
20,000 pounds
What is meant by the fulcrum of a lever?
The point on which the beam pivots.
Give an example of a first-class lever, second class lever and third class lever?
First class: See-saw
Second class: Wheelbarrow
Third class: Fishing rod
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 five inches?
100 cubic inches.
(F = A x D)
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 Fahrenheit?
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 mechanic’s advantages of a gear train?
The ratio of the gears final speed to the initial gears speed in the gear train
Final gear speed : initial gear speed
What determines the mechanical advantage of an arrangement of ropes and pulleys?
The number of rope segments pulling up on the object.
