# Shared Flashcard Set

## Details

Dynamics
Final Study Guide
28
Aerospace Engineering
06/11/2013

Term
 Check on particle changing direction
Definition
 Happens at V=0. If velocity changes signs over amount of time.
Term
 How to find time when particle changes direction
Definition
 Finds "zeroes" of velocity equation
Term
 Determine relative velocity & position w/ pulleys
Definition
 Find relation with overall length = different individual lengths
Term
 Path Variables
Definition
 Tangential & Normal Coordinates
Term
 Polar/Cylindrical Coordinates
Definition
Term
 Direction of Tangential & Normal (Parabolic, Circle, Straight)
Definition
 Par&Circle-Normal towards center of radius, tangential in direction travel...Straight-either up or down... Tang-straight along path direction
Term
Definition
 Er need to be in direction R from origin...tranverse up away from surface(counter 90 from Er)
Term
 Finding acc. w/speed constant on circle
Definition
 use 2nd comp. -> V^2/p * en only ....other is zero
Term
 Get velocity after certain time?
Definition
 Vo + acc(t-to)
Term
 Want Normal force on non-straight path
Definition
 Use only Fn=m*v^2/p component
Term
 Using R&Theta comp, have 1 that = 0
Definition
 Guess an integral & to get derivative that=0 to get constant.(Q2#3)
Term
 U(1-2)? and = what?
Definition
 Work = integral F*dr....=T2-T1
Term
 Work-Energy for U(1-2) take what into account?
Definition
 Work of Gravity & Friction!(and spring if there is one)
Term
 Work-Energy alternate solutions? what changes
Definition
 Placement of T1, if have velocity it exists, if from rest=0
Term
 With Work from spring(-.5ks^2) involved what use to get solution
Definition
Term
 Impulse-Momentum ->what need to conserve?
Definition
 No external forces on the collision
Term
 Central vs. Oblique Impact
Definition
 direction of motion of the mass centers of the two colliding particles is along a line of impact vs. motion of one or both of the particles is at an angle with the line of impact
Term
 Ang. Momentum conservation equation?
Definition
 H2-H1=int.Momentum
Term
 Ang.Mom the Mo is summation of?
Definition
 Forces cross radius in each direction (er,etheta,k)
Term
 Slip happens when w what
Definition
 If one of i or j calcs gives w=0 then there is slip
Term
 Choose Path vs.Polar
Definition
 If given Velo & acc center curvature-Path...Polar-for anything with change in theta
Term
 (acc)xy aka
Definition
 acc. relative *(unit vector)
Term
 Steps needed when asked for ang.acc. w/rotating reference frames
Definition
 Use longest equation...solve for every component first, drop a^rel, separate into components plug & chug
Term
 Rotation of Fixed body about fixed axis what need?
Definition
 Force in normal & tangential. Moment about G(center gravity)
Term
Definition
Term
 What cancels in rotational motion when start from rest?
Definition
 No omega(ang.velo)
Term
 Rolling, w/no slip...use omega & r to get ?
Definition
 w&r=v ...a=alpha*r
Term
 Kinematics eqtns?
Definition
 ag= ac + ag/c
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