Lesson 5 - Free Fall Motion

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