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Problem Solving with Newton's Laws
......a rough model
State Assumptions Explicitly
air drag to be neglected
initially friction will be neglected since rolling resistance is low
all frictional forces assumed to act opposite motion
Written description
gravity assumed downward toward bottom of picture
http://coccweb.cocc.edu/bemerson/public_html/physics/PH211/211resources/Newton%27sLawProcess2.html
1:
x axis
2:
do these apply?
6:
+
_
Force models
F
y axis
f
describe some forces on freebody diagram
2:
rolling resistance:
=0
+
_
..just like "regular" friction
_
Friction:
F
N
Kinetic
F
N
Static
_
typically:)
F
g
checking back
Freebody Diagram/Force Picture
Cleaned up Freebody!
+y
Leave orientation the same as on sketch
use if needed
+y
4:
+x
y component
x component
tidy up!