Session 1 - Force and Pressure Flashcards
Causes of Motion
Newton's first law Newton's Second Law Newton's third law Vectors Gravity Frictional Forces
Newton’s First Law of Motion
Every object in a state of uniform motion tends to remain in that state of motion unless an external force is applied to it
(An object at rest remains at rest until a force acts upon it) (AKA The law of inertia)
(The greater the mass of an object, the more force is required to get it moving)
Newton’s Second Law of Motion
The relationship between an object’s mass m, its acceleration a, and the applied force F is F=m*a. Acceleration and force are vectors (as indicated by their symbols being displayed in slant bold font); in this law the direction of the force vector is the same as the direction of the acceleration vector
Newton’s Third Law of Motion
for every action there is an equal and opposite reaction
motion
the constant change of position
velocity=
displacement/time
Vectors
- have both magnitude and direction
will be denoted in boldface
vectors can add together to give a resultant vector
the resultant runs from tail of the first to head of the second
Acceleration=
change in velocity/change in time
gravity=
9.8m/s(squared)
Force is
a push or a pull
Force is related to mass by Newton’s second law
F=ma
where f is force, m is mass and a is acceleration
A net force is required to accelerate a mass
Pressure is _______ proportional to the area
inversely
P = f/a
Pressure is _________ proportional to the cross section of the radius
inversely
1 atm =
760 mmHg
760 torr
101325 Pa
1atm = 1.013 bar
Pascal’s Principal
When an external pressure is applied to confined fluid, it is transmitted unchanged to every point within the fluid
(example: Pressure monitoring lines in the ICU)
Resistance to flow is defined as R=
change in pressure/flow
R equals resistance
