Today s'topics'
Springs
Relaxed spring
Springs)
Free)body)diagram)
Sign)conven4on)
xspring
F1
F2
Across)&)Through)variables)
Linear/nonlinear)cons4tu4ve)laws)
Relates Force to Displacement
Sign convention:
Through variable:
Across variable:
Work)it)O

EA3 Week 2-1
Spring 2015
Solving Equa:ons of Mo:on
RQ 2-1. Remember: more than one answer can be correct
1. Our dieren8al EOM for the spring-damper system
A. can never be solved analy:cally
B. re

Quiz on Friday
Covers: systems with masses, Newtonian Mechanics,
momentum, energy
The following formulas will be provided:
Momentum: p = mv
Conservation of momentum: mava + mbvb = mava + mbvb
Kinetic energy: KE = mv2
Potential energy: mgh (gravity); kx2

Todays Outline
Newton s Laws
Velocities and accelerations
Tangential and normal components
Normal acceleration with motion on curved path
Center of Mass: Fext = mtot*aCM
Position: mtot*rcm = miri
CQ1
A
B
A pellet of mass m is blown through
a frictio

EA3 Week 7-2
Chemical Systems Diffusion
Spring 2015
Peer Reviews were Due today by 9am
HW7 due Tuesday 9am
RQ 7-2
1. In chemical systems, motion of species occurs by:
(A) active transport
(B) diffus

Quiz 2 Results
Graded! : Average 76% (11.8)
Problem VI (EOM) graded manually with partial credit
Problem IV (Pi and Tiger) graded with partial credit for
questions 49, 50
Remainder only right or wrong. 1 or 2 points each.
Good news
- you are good at

EA3 Week 9-1
Electrical Systems RC Circuits & State Eqs
Spring 2015
Homework 8 was due Today by 9am
Peer Review due Thursday 9am
RQ 9-1 (T/F)
1. Counting equations and unknowns
A. is hopeless as there

EA3 Week 7-1
Chemical Systems Mass Balance
Spring 2015
Homework was Due Today 9am
Peer Review due Thursday by 9am
RQ 7-1
1. Industries that make use of chemical processes include
(A) food
(B) energ

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False
True
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9 V
0.9 coulombs
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4.5 V
0.45 coulombs
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CQ Communication Etiquette
Which of the following are examples of good communication
etiquette?
A) Posting on Piazza/Canvas (public forum) general questions
of potential broader interest
B) Posting on Piazza/Canvas (public forum) personal
questions about

EA3$Week$9*2
Electrical$Systems$State$Eqs$for$2*State$Systems,$
Inductors,$LRC$Circuits
Spring$2015$
Peer$Review$HW8$due$Friday$9am$
Homework$9$Due$Tuesday$by$9am$
No$Peer$review$for$HW9!
BOX your answers and BE NEAT!
Todays$Outline
State$equations$for$a$

EA3 Week 8-1
Electrical Systems
Spring 2015
Homework 7 was Due today by 9am
Peer Review due Thursday by 9am
Quiz 4 on Friday!
RQ 8-1 (T/F)
1. The conserved quantity in an electrical system is
A. voltage