Book Highlights Flashcards
When _______ atoms are bound together chemically, they form molecules of an element.
- Like
- Unlike
LIKE
A molecule is the smallest division which can be made in a substance and still retain all the properties?
When UNLIKE atoms are bound together, they form a molecule of a?
COMPOUND
When 2 different elements or compounds are mixed together and the molecules DO NOT combine chemically, the substance is known as a?
MIXTURE
What 2 things determine the state of matter?
TEMPERATURE
&
PRESSURE
When a substance is heated, its activity or molecular speed is increased and the volume of the substance normally expands?
TRUE
Convert Fahrenheit to Centigrade, subtract 32 and multiply the remainder by 5/9.
Convert Centigrade to Fahrenheit, multiply by 9/5 and then add 32.
When the temperature can reach no lower, and molecular motion has ceased, that temperature is know as?
ABSOLUTE ZERO
-460F DEGREES
Formula for Density or Specific Weight of an object?
DENSITY = TOTAL WEIGHT / VOLUME
A closed space from which all air or gasses have been removed is called a?
VACUUM
The resistance of a fluid to flow is called?
VISCOCITY
What are the 2 forms of energy?
POTENTIAL & KINETIC
Energy due to the position of the mass is called?
POTENTIAL
Energy due to the motion of a mass is called?
KINETIC
The rate at which work is done is called?
POWER
What are the 2 types of Velocity?
CONSTANT
&
VARIABLE
The force or shock which results when the movement of a confined liquid is suddenly arrested or accelerated is called?
WATER HAMMER
Velocity is the rate a mass travels in a particular direction
TRUE
The six simple machines are?
- LEVER
- INCLIED PLANE
- WEDGE
- SCREW
- WHEEL & AXLE
- PULLEY
Levers of the third class multiply ________ or _________, rather than force.
SPEED or DISTANCE
If the wheel is driving the axle, there is a loss in mechanical advantage of speed because the driving belt is traveling seven times faster and farther than the driven belt on the axle.
On simple machines it is POSSIBLE to gain both force and speed at the same time?
FALSE
Simple machine can only gain one or the other.
Either speed or force, but not both.
Gears serve a four-fold purpose, what are they?
- Change speed
- Change direction
- Transmit positive force
- Increase or decrease force
In an odd number of gears in a simple gear train, the driver and driven gear will rotate in opposote directions
FALSE
They will travel in the same direction
Inclied Plane
- The effort (E) acts parallel to the inclied surface or “slope”
- The object offering resistance (R) is either pushed or pulled up the slope
- The length of the slope is called the _____ _____ (__)?
EFFORT DISTANCE (ED)
Most screw threads are said to have a definete number of threads per inch.
TRUE
