SEISMIC SLEUTHS Part 1 Newton’s Laws
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Transcript of SEISMIC SLEUTHS Part 1 Newton’s Laws
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SEISMIC SLEUTHS Part 1Newton’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
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Newton’s Laws of Motion:
• _____________________• Objects keep on doing what they are
doing.
http://www.physicsclassroom.com/mmedia/newtlaws/cci.cfm
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______ 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 __________ __________.
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_________________: if the net force on an object is _______ (at rest or moving at a constant velocity)
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________ friction
• _______ friction results when the surfaces of two objects are at rest relative to one another
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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
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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
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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
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___________ 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.
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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
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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.
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3rd law:
• __________________________________________________________________________
http://www.physicsclassroom.com/mmedia/momentum/crete.cfm