Free fall and acceleration
equation for weight to mass ratio
g=fg/m so g=m/s² so g=a
equation for average free fall acceleration at the surface of the earth
g=m/s²
for a free falling object, how does the distance it falls per second change with each second of fall?
increase
why don't objects stop as air resistance is acting on them?
inertia
how does air resistance affect falling objects?
it slows them down until the forces are equal
as first stated by Galileo: "in a vacuum, and only in a vacuum, all bodies fall with the same acceleration"
law of falling bodies
a measure of the inertia of an object or a measure of the quantity of matter in an object
mass
the SI unit of pressure
pascal
the force per unit of surface area where the force is perpendicular to and toward the surface of the object
pressure
the force exerted by any fluid on an object moving through the fluid
resistance or drag
the speed at which the acceleration of a falling object becomes zero because the upward force due to fluid resistance balances the downward weight force
terminal speed
the speed and direction of an object in free fall at which the acceleration of the object becomes zero
terminal velocity
what category of motion is free fall?
uniformly accelerated linear motion
a region where there is no air or any other gaseous quantity, and therefore, absolutely no air resistance
vacuum
what factors affect the air resistance force on an object?
velocity and area in direction of motion
a measure of how resistant a fluid is to flow within itself or to the flow of objects through the fluid
viscosity
the downward force on an object due to the gravitational pull of earth on the object
weight
the weight of an object divided by the mass of the object
weight to mass ratio
what is acceleration at terminal velocity
0
what is the acceleration of an object in free fall at the surface of the earth?
9.8m/s²
equation for pressure
N/m²
the vertical upward or downward motion of an object when the only vertical force acting on it is gravity
free fall
how is pressure related to force
F/A (N/m²)
the acceleration of an object when gravity is the only force acting on it
free fall acceleration
a force that opposes the motion of a body through air and that is the result of collisions between the moving body and the molecules that compose air
air resistance
how does air resistance affect the net force?
decreases it until it is zero
the time that has passed since the beginning of an event
elapsed time
anything that flows; in particular any liquid or gas
fluid
