By: Erica Ambrogio
What is needed to make the reaction take place?
Fire is the visible effect of The products from the
the process of combustion chemical reaction are
– a special type of chemical completely different from
reaction. It occurs between the starting material.
oxygen in the air and some The fuel must be heated to
sort of fuel. its ignition temperature for
combustion to occur. The
reaction will keep going as
long as there is enough
heat, fuel and oxygen
How is it possible?
There are certain chemicals Magnesium burns so hot it
that, when accompanied splits the surrounding
with their own source of water into hydrogen and
oxygen, can burn oxygen, and burns with the
Magnesium and Sodium Makes it incredibly
are elements that react difficult to put out.
with water to create fire.
Certain forms of Sodium
actually EXPLODES upon
contact with water:
Underwater lake in Bikini Bottom?
As unlikely as it sounds, there are a
handful of underwater lakes and rivers
boasting their own mini ecosystems.
Brine Pools: Brine pools are large areas
of brine on the ocean basin. These pools
are bodies of water that have a salinity
three to five times greater than the
surrounding ocean. For deep-sea brine
pools the source of the salt is the
dissolution of large salt deposits through
Underwater Lake (Brine Pool) found at the bottom of the Gulf of Mexico
Mr. Taylor has this clip
How does free-fall normally work?
because free-falling objects are accelerating downwards
at a rate of 9.8 m/s/s (a graph of the objects flight path
would show acceleration)
The dot diagram (next slide) shows the acceleration of
a free-falling object. Shows the position of the object at
constant time intervals
The fact that the distance the object travels every
interval of time is increasing is a sign that the ball is
speeding up as it falls downward.
When first jumping into
a pool or lake or any type
of water the body is
accelerating just the
same as in air (9.8 m/s)
HOWEVER, the body
will slow down rather
because of the resistance
the water offers.
Water does not flow as freely as other materials
WHERES THE PROOF?
As Spongebob and Patrick
jump off the cliff, they will
be accelerating for only
about the first 5 seconds.
After that, the resistance
of the water will slow
them down until
eventually they are simply
sinking in the water.
What REAL free falling in water would be like:
Fact or Fiction #4: Spongebob
throwing marshmallows at
FICTION! Newton’s Third Law of Motion
An object at rest will remain at
rest unless acted on by an
unbalanced force. An object in
motion continues in motion with
the same speed and in the same
direction unless acted upon by an
“Objects keep doing what they’re doing.”
So, What’s Wrong?
• Based on this law we understand
that the creators of Spongebob have
got it wrong yet again.
• Nothing was in the marshmallows
path to stop it except for the water it
began moving in.
• However, even with the water
slowing down the marshmallow, it
would fall after losing its momentum.
• Instead, the marshmallow changes
direction on its own (also against the
1st law) and comes back to splatter on
But doesn’t the marshmallow’s
weight make a difference?
• The tendency of an object to resist changes in motion
changes with mass. Mass is the quantity that is solely
dependent upon the inertia of an object.
• The more inertia that an object has, the more mass that
it has. A more massive object has a greater tendency to
resist changes in its state of motion.
• However, while the marshmallow would not have a lot of
inertia it would continue to move regardless