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Exam 2 Review

Exam 2 Review. Jerika McKeon You will need your CID for the exam- Memorize it!!!!!. Announcements. Other Reviews: Tomorrow @ 5:30-7pm Friday @1-3pm ( weekly ) 108 MARB Check to see if you are missing any FBD scores. If you are, check the boxes to see if you put the wrong CID.

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Exam 2 Review

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  1. Exam 2 Review Jerika McKeon You will need your CID for the exam- Memorize it!!!!!

  2. Announcements • Other Reviews: • Tomorrow @ 5:30-7pm • Friday @1-3pm (weekly) 108 MARB • Check to see if you are missing any FBD scores. • If you are, check the boxes to see if you put the wrong CID. • Turn it back into the 105 Appeals box. • I’m behind on extra credit, but I will grade it. Don’t worry about sending me an other copy. I will email you once your extra credit is in Max.

  3. Energy • Kinetic Energy • Potential Energy • Gravitational PE • Spring PE • Work • W=change in energy • W=F//d • Work lost by friction • Power (NOT IN SYLLABUS) • P=ΔE/Δt • Conservation of Energy • Work-Energy Theorem • Collisions • Elastic • Inelastic • Perfectly Inelastic

  4. Energy Cont. Kinetic Energy Potential Energy Linear KE KE=1/2*m*v^2 Rotational KE 1/2*I*ω^2 Depends on moment of Inertia (we’ll talk about that in a minute) Gravitational PE PE=mgy PE=-GMm/r PE=0 at r=∞ Escape velocity equations Spring PE F=-kx PE=1/2*k*x^2 Always positive (for both compressed & stretched springs)

  5. Linear Momentum • p=mv • Conservation of momentum- When is this true? • Impulse=Ft • FΔt=Δp

  6. Collisions Elastic Inelastic Energy is conserved Conservation of momentum and conservation of energy Can use the velocity reversal equation Usually you will use 2 equations and make some substitutions to get your answer Inelastic Energy is not conserved Use conservation of momentum Perfectly Inelastic Energy is not conserved; Max energy is lost Objects stick together Use conservation of momentum

  7. Conservation of Energy • Ei+Wnet=Ef • Wnet • Energy lost from friction • Energy gained through other forces • Photogate problem!

  8. Angular Stuff • Angular Kinematics • Δθ=θf – θi • ω=Δθ/Δt • α=Δω/Δt • Other kinematics equations • Conversions- all θ must be in radians • s=rθ • v=rω • a=rα

  9. Moment of Inertia • Analogous to mass • Depends on how the mass of an object is distributed • I=mr^2 for point mass • I=other stuff for other shapes

  10. Angular Momentum & KE • Angular momentum • Li=Lf • L=Iω • L=rp (hidden angular momentum) • KE=1/2*I*ω^2

  11. Torque • Pivot Points • T=rF • Tnet=Iα • Sum of Torques just like sum of Forces • Counterclockwise = positive • Clockwise = negative • Equilibrium = no angular or linear acceleration • Tnet=0 • Fnet=0

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