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gravity
an attractive force that acts on any two objects with mass
free fall
an object being acted upon solely by the force of gravity
free falling objects do not…
encounter resistance
g =
9.8m/s²
object being thrown upward
positive vertical velocity
negative downward acceleration
slows until v=0
object coming down
acceleration is still downward
velocity is now negative
acceleration is negative (a does not equal zero)
speed increases
mass
amount of MATTER in an object
weight
measure of GRAVITATIONAL ATTRACTION of an object
gravity depends on…
the mass of objects and their distance from each other
gravitational force follows a…
inverse-squared relationship
greater mass =
greater gravitational force
greater distance =
weaker gravitational force
Law of Universal Gravitation
every object in the universe is attracted to one another by a force
air resistance
caused by the friction between a falling object and air particles
the quantity of air resistance depends on…
the shape and speed of a falling object