WELCOME
TO SOME
INTERESTING BEGINNING
FACTS FOR MEC 104,
PRACTICAL SCIENCE OF THINGS
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What
is the main purpose of MEC 104?
MEC 104 is a class that is able to broaden
our perspectives on daily familiar objects and situations
by helping you understand the physical processes that make them work.
Physics is apart of our everyday lives and we sometimes we take physics
for
granted.
Here
is some of the important beginning base information for MEC 104...
The Early Discover...
Galileo 1564-1642;
discovered Inertia. What is Inertia is
your question?
Inertia
is the finding of Galileo that states any outside influences tends to
remain in motion if in motion
and at rest if at rest.
What does this mean?
To make
clearer an example would
be a bicycle that is rolling forward on level
pavement at a modest pace. The wheels prevent friction from slowing the
bicycle down while its modest pace limits the effects of air
resistance. The pavement supports the bicycle so that it doesn't fall.
With these problems out of the way, the bicycle exhibits inertia, it
just simply Coast.
The Early Physicist gets the Idea...
Sir Isaac
Newton; a english
mathematician and physicist came up with the the Three laws of motion.
- Newton's
First Law of Motion; An
object is
not subject to any outside forces moves at a constant velocity,
covering equal times along a straight-line path.
- Newton's
Second Law of Motion: The
force
exerted on an object is equal to the product of that objects's mass
times its acceleration. The accretion is in the same direction as the
force. F=M*A
- Newton's
Third Law of Motion: For
every force
that one object exerts on a second object, there is an equal but
oppositely directed force that the second object exerts on the first
object. EXAMPLE:
Kicking a Soccer ball. Both the foot and ball have equal force upon one
another.
Sir Issac Newton;
Laws of Rotational Motion
- A
Key Term to understand;
Torque-
An influence that if exerted on a
free body results chiefly in an angular acceleration of the body. A
torque is a vector quantity.
- First
Law; a rigid object that is not wobbling and is not subject to
any
outside torque's rotates at a constant angular velocity, turning equal
amounts in equal times about a fixed axis of rotation.
- Second
Law; The torque exerted on an
object
is equal to the product of that object's moment of inertia times its
angular acceleration. Torque=Moment
of Inertia * Angular Acceleration
- Third
Law; For every torque that
one
object exerts on a second object, there is an equal but oppositely
directed torque that the second object events on the first object
Besides
Newton's Three Laws of Motion, their other Laws and Equations...
- Relationship
between Mass and Weight; An
objects
weight is equal to its mass times the acceleration due to gravity. W=M*ACCERLATION due
to gravity
- The
Velocity of an Object Experiencing Constant Acceleration; The objects present velocity differs from
its initial velocity by the product of its acceleration times the time
since it was at that initial velocity. Present Velocity=initial
velocity + ACC*T
- The
Definition of Work; The work
done on
an object is equal to the product of the force exerted on that object
times the distance that object travels in the direction of force. W=F*D