Physics Exam 2

Physics Exam 2

1. Circular Motion

   • Acceleration is not constant
   • analyzed in terms of accel and Forces
   • Uniform circular motion
     • Direction is always changing
     • vector is always tangent to circle
     • Period of motion
       • T=2pi(r)/v
     • centripetal acceleration
       • ac=v^2/r
   • Force directed toward center of circle
   • Tbottom=m(v^2/r +g)
   • Ttop=m(v^2/r -g)

2. Gravitation

   • Fgrav=Mperson(g)=GMpersonMearth/r^2earth

3. Work and Energy

   • W=F(displacement)
   • Newtons x meter= Joule
   • Kinetic energy
     • 1/2mv^2
   • potential energy
     • W=mgh
     • PEchange=PEfinal-PEinitial=-W
   • mechanical energy
     • sum of potential and kinetic energies
   • Power
     • Pave=W/t

4. Momentum

   • p=mv

5. impulse

   • F(change in t)=change in momentum

6. collisions

   • elastic
     • energy conserved
   • inelastic
     • kinetic energy is lost

7. Rotational Dynamics

   • wf=wi+at
   • theta(final)=theta)initial)+wt+1/2at^2
   • wf^2=wi^2+2a(thetaf-thetai)
   • theta=s/r
   • angular velocity
     • w ave= change in theta/change in t
   • linear and angular accelerations
     • at=ar