The Danger ZoneThe Danger Zone

April 23, 2008April 23, 2008

EF 151EF 151

Final Group ProjectFinal Group Project

Our TeamOur Team&&

Our ProjectOur Project

Evan “Echo” Harb

Jessie “Juliet” Moore

Caleb “Charlie” Williams Reuben “Romeo” Robertson

Conservation of EnergyConservation of EnergyKEKE + PE + + PE + WWinin = KE = KEff + + PEPEff + + EElossloss

PE = KEPE = KEff

mgh = 1/2mv2

(.008)(9.81)(.085) = 1/2(.008)v2

V = 1.29 m/s

Projectile MotionProjectile Motiony-yy-yoo = (x-x = (x-xoo)tan)tanθθ – (g/(2V – (g/(2Voo

22)(1+tan)(1+tan22θθ)(x-x)(x-xoo))22

θ = 5.47

Conservation of MomentumConservation of Momentum

MM1 1 = Marble M= Marble M22 = Rat = Rat TrapTrap

MM11VV11 + + MM22VV22 = M = M1f1fVV1f1f + + MM2f2fVV2f2f

MM11VV11 = = MM1f1fVV1f1f

VV11 = V = V1f1f

VV1f 1f = -1.28 m/s= -1.28 m/s

ConclusionConclusion

Friction was Friction was neglected neglected on ramp and on ramp and in funnelin funnel

Coefficient Coefficient of of Restitution Restitution is ignoredis ignored

Marble hits the Marble hits the trap with 80% trap with 80% accuracyaccuracy