2nd QT Flashcards
Study of objects at rest
All forces acting on the body are balanced
static equilibrium
Point at which the weight is
evenly dispersed
Center of Gravity
For elongated bodies or
objects
COG is found at the fulcrum
where the object is pivoted.
Balancing Method
For regularly-shaped bodies
such as spheres, cubes, etc.
COG lies at its geometric
center
Geometric Method
For irregularly-shaped bodies
Object is suspended using a plumb
line or string
Intersection of lines drawn as traced
is the center of gravity of the object.
Plumb-Line Method
state of equilibrium where the body returns to its original position.
Stable Equilibrium
State of equilibrium where the
object moves to a different
position.
Unstable Equilibrium
the object moves to a different position but the COG is the same
Neutral Equilibrium
Methods Of Getting Equilibrium
Balancing
Geometric
Plumb-Line
States Of Equilibrium
Stable
Unstable
Neutral
factor affecting the stability of an object
Area of the base (the wider, the stable)
Position of the COG (the lower, the stable)
Weight of an object
Advantages of Taking down the COG of a vehicle (RIII)
Improved Aerodynamics
Improved Handling and Traction
Reduced Risk of Rollover
Improved Comfort
Disadvantages of Taking down the COG of a vehicle (IUCD)
Increased Bottoming Out
Unevenness in the Tire Wear
Conflict with Other Systems and Components
Damage to parts when flooding
Travels in the same speed as the speed of light (3.0 x 108
m/s)
Rectilinear motion (travel in straight line)
Electromagentic Wave
Electromagnetic Radiation/Spectrum
Gamma Rays (shortest, high energy) X-ray Ultraviolet Visible Light Infrared Microwave Radio (longest, low energy)
Most energetic form of light and have the shortest wavelength
Produced by supernova explosions or devastation of atoms.
Gamma Rays
Benificial use/harmful effect of gamma rays
Benefits:
Detecting cracks in pipes and aircraft parts
Sterilize medical equipment
Kills cancer cells
Harmful:
severe damage to human tissues
First observed by Wilhelm Roentgen
Emitted by Sun, stars, and comets
X-rays
from the sun
Ultraviolet Rays
Responsible for being to see
the physical features of the
world
Used in photosynthesis
Visible Light
Thermal in nature
The warmer the object is, the
higher the infrared radiation.
Infrared
Used for Doppler radar to determine
weather
Used for heating food
Waves used for viewing Earth from
space
Microwaves
Can travel long distances
Longest wavelengths in the
EM spectrum
Lowest energy, lowest
frequency
Used in electronic
transmission of sound
Radio
Benificial use/harmful effect of radio waves
Benefits:
Telecommunication
Broadcasting
Harmful:
May cause cancer and leukemia
Headache
Increased body temperature
