Transcript HONORS PPTX Format

Momentum
Or, “How to make Newton’s
Laws even more complicated
without even trying…”
Daryl L Taylor
Greenwich HS, CT
©2004, 2006, 2007, 2009, 2012 (Just in case…)
Nitty Gritty?

Definitions?
•‘member FMA?
F  ma
F  ma
v
F m
t
Impulse
Latin impulsus, from past participle
of impellere, to impel
Impel: See impulse…
Ft  mv
Ft  mv
Momentum
Latin mōmentum, movement
Nitty Gritty?

Definitions?
•P Conservation
Pi  Pf
m1v1  m2 v2 
'
m1v1
Why?
'
 m2 v2
F1  F2
m1a1  m2 a2
m1v1
m2 v2

t
t
m1v1  m2 v2
POP
QUIZ;
#1
2-D Momentum

Momentum is a linear vector
1   2
m1v1  0  0  m2 v2
2-D Momentum

Angles?
m1v1i
2-D Momentumm v
2 2f

Angles?

m1v1i

m1v1f
2-D Momentumm v
2 2f

Angles?

m1v1i

m1v1f
POP
QUIZ;
#2
2.5 m/s
Types of Collisions;
•Elastic
 AND KE are conserved

i   f
KEi  KE f
Types of Collisions;
•Inelastic
 ONLY are conserved

i   f
POP
QUIZ;
#3
MV & cm

cm
• Center of Mass

NOT to be confused with Center of
Gravity (cg)
MV & cm

cm
• Examples
MV & cm

Cm
• Examples
MV & cm

cm
MV & cm

Cm – Hume Beans
• Bending over
• Sitting
• Standing
• Walking
• One-Leg Lift (Wall & Free-standing)
• Butt against wall – Touch toes
• Chair pick-up
• Babies vs Adults

Head size – ¼ vs 1/8
MV & cm

Cm – Hume Beans
• Wile E. Coyote Video
• m-stick and hat
• Rolling UP HILL demo