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SEISMIC SLEUTHS Part 1
Newton’s Laws
EARTHQUAKES AND
PHYSICS?
•
Newton’s laws
•
Liquefaction lab
•
Smart Sitting
•
Energy and Quakes
CAN BUILDINGS BE MADE
SAFER?
• Building Fun
• Structural Reinforcement
• BOSS
• Earthquake in a Box
• Building Challenge
• Find and Fix the Hazards
• Strengthening your
House
Newton’s Laws of Motion:
• _____________________
• Objects keep on doing what they are
doing.
http://www.physicsclassroom.com/mmedia/newtlaws/cci.cfm
______ is directly related to _____.
• The greater the mass the greater the tendency
to ___________change of an object’s motion.
• objects will continue to do as they are doing
__________ __________.
_________________: if the net force on an
object is _______ (at rest or moving at a constant velocity)
________ friction
• _______ friction
results when the
surfaces of two
objects are at rest
relative to one
another
2nd law: ______ _______: something that
disturbs an object’s equilibrium (net force changes an object’s velocity
or acceleration)
• Need to be able to
find the net force
(sum of all forces on
an object) since net
force causes an
object’s acceleration
http://www.physicsclassroom.com/mmedia/kinema/avd.cfm
2nd Law: acceleration of an object is proportional
to the mass of the object being accelerated
• __________
– a is in m/s/s
– m is in kg,
– F is kgxm/s/s or
________
• __________ (weight)
– Gravity (9.8 m/s/s)
http://www.physicsclassroom.com/mmedia/newtlaws/efar.cfm
Unbalanced force
• The _________ force is
cancelled by the force of
_________.
• The book is sliding to the
right but there is
_____force in that
direction.
• Because _________
friction is currently the
only horizontal force it will
cause the book to come
to a stop
___________ Friction
• If a car slams on its
brakes and skids to a
stop (without antilock
brakes), there is a
sliding friction force
exerted upon the car
tires by the roadway
surface.
Causes of friction:
• When the high points of each surface touch they bond,
you must break these bonds to move one of the pieces
(origin of static friction)
• As surfaces move across each other, _________ forces
continue to attract between high points, resulting in the
weaker kinetic friction
• Air drag (any fluid) depends on speed of the motion
(getting larger as speed increases)
• size and shape of object
• _________ of fluid
Forces
• ________________
The contact force that
acts to oppose sliding
motion between surfaces.
____________ to the
surface _____________
the direction of sliding
• ______________
The contact force exerted
by a surface on an object.
_______________ to and
away from the
acceleration of the object
barring any resistive
forces.
3rd law:
• _____________________________________
_____________________________________
http://www.physicsclassroom.com/mmedia/momentum/crete.cfm