ENT301: STATICS - UW-Madison Department of Mathematics › ~pgera › ENT301_31Aug2015.pdf ·...
Transcript of ENT301: STATICS - UW-Madison Department of Mathematics › ~pgera › ENT301_31Aug2015.pdf ·...
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WHAT IS THIS COURSE ABOUT?
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Hyatt Regencey Wall Collapse• Date: July 17th, 1981• killed 114, and 214 injured
http://henryjenkins.org/2013/10/mules-trojan-horses-dragons-princesses-and-flies.html
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https://en.wikipedia.org/wiki/Hyatt_Regency_walkway_collapse
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NEWTONS LAWS
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Newtons 1st Law:An object at rest stays at rest and an object in motion stays inmotion with the same speed and in the same direction unlessacted upon by an unbalanced force.
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Newtons 2nd Law:When the sum of forces acting on a particle is not zero, the sumof the forces is equal to the rate of change of linear momentumof the particle. If the mass is constant, the sum of the forces isequal to product of mass of the particle and its acceleration.
http://www.pixton.com/schools/gallery/n3bxfa4u
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Newtons 3rd Law:For every action, there is an equal and opposite reaction. Theforces exerted by two particles on each other are equal inmagnitude and opposite in direction.
pintrest.com
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SI UNITS- WHY?
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NASA MARS CLIMATEORBITER
• Date: September 23rd 1999.• Lockheed Martin which was performing the calculations
was sending thruster data in English units to NASA whileNASA navigation team was expecting metric units.
• Loss: $125 million
http://www.cnn.com/TECH/space/9909/30/mars.metric.02/
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A KEY FEATURE OF SIUNITS: PREFIXES
VARYING IN MULTIPLESOF 10
Prefix Abbreivation Multiple
nano- n 10−9
milli- m 10−3
killo- k 103
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US CUSTOMARY UNITSVS SI UNITS
Item of measurement SI US Customary
Length meters feetMass Kilogram poundsTime Seconds Seconds
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Newtonian Gravitation:Newton’s law of universal gravitation states that any two bodiesin the universe attract each other with a force that is directlyproportional to the product of their masses and inverselyproportional to the square of the distance between them.
where G is the universal gravitational constant.