• If you drop a flat piece
of paper from the height
of one meter ten times
and a crumpled piece of
paper from the height of
one meter ten times
which one will fall
faster?
Created by Campesi, SMS
•If I drop a tennis ball
and a golf ball at the
same time from the
same height which one
will land first?
• If no force other than
gravity acts on a falling
object all objects will
land at the same time
regardless of their
weight!
• The tennis ball and golf ball
will land at the same time.
• All objects fall to the
ground at the same
rate because the
acceleration due to
gravity is the same for
all objects.
•Air Resistance slows down
acceleration.
Fluid Friction
Air resistance, ______________,
occurs between the surface of
the falling object and the air
that surrounds it.
• The amount of air
resistance on an object
depends on the size and
shape of the object.
When the downward and
upward forces balance
and the object no longer
falls faster it is called:
Terminal velocity
• The object will fall at a
constant speed and not
accelerate.
• http://www.physicsclassr
oom.com/mmedia/newtla
ws/efar.html
• Free fall
occurs
when there
is no air
resistance.
• Free fall can only
occur in a vacuum or
space.
• http://www.physicsclassroo
m.com/mmedia/newtlaws/ef
ff.html
• Astronauts
“float” in
orbiting
spaceships
because of
free fall.
•
http://www.fearofphysics.com/
Zerog/zerog.html
• Two motions combine to
cause orbiting.
http://www.pbs.org/wgbh/nova/station/freefalling.ht
• WhenProjectile
you throwMotion
something it
follows a curved path to the
ground this is called
Projectile motion.
Projectile
Motion
There
are two forces
acting on the ball.
1. Downward force of
gravity.
2. Horizontal force of
velocity.
•
http://www.fearofphysics.com
/XYIndep/xyindep.html
• A dropped
ball and a
thrown ball
will land at
the same
time!