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
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. - PowerPoint PPT Presentation
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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
Newton’s Laws of Motion:
• 1st Law: Law of Inertia• Objects keep on doing what they are
• The normal force is cancelled by the force of gravity.
• The book is sliding to the right but there is no force in that direction.
• Because SLIDING friction is currently the only horizontal force it will cause the book to come to a stop
Sliding 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.
• 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, electrostatic 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• density of fluid
Forces• (Ff) Friction Force: The
contact force that acts to oppose sliding motion between surfaces. Parallel to the surface Opposite the direction of sliding
• Normal force (FN): The contact force exerted by a surface on an object. Perpendicular to and away from the acceleration of the object barring any resistive forces.
3rd law:
• For every action there is an equal and opposite reaction