Transcript Document

Gravity and Motion
Gravity and Acceleration
Objects fall to the
ground at the
same rate
because the
acceleration due
to gravity is the
same for all
objects.
So, for every
second that an
object falls, the
object’s
downward
velocity
increases by 9.8
m/s2.
Air Resistance & Falling Objects
• As an object falls, its
velocity increases.
• As velocity increases, air
resistance increases.
• Eventually, the air
resistance will grow until it
equals the force of gravity.
• At this point the forces are
balanced and there is no
more acceleration.
• When an object stops
accelerating, it has reached
what is called terminal
velocity
Fair resistance
F gravity
Book versus Paper
Free Fall
Astronauts
float in
orbiting
spacecrafts
because of
FREE FALL!