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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!

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