assumptions:
- no air resistance
- no friction
- a=0 ( ax=0 and ay=0 )
- break down in to x and y components
- T1x=T2x
- set positive axis⊕
for inclined problems:
assumptions:
- no air resistance
- FN perpendicular to the surface
- +axis is the direction of the motion
- break down in to x and y components
- acceleration does not equal to zero
- FN-Fgy=0
- Fgx-f=ma
for pulley problems:
assumptions:
- pulley is frictionless
- rope is frictionless
- no air resistance
- + axis is the position of the
- 2 Free Body Diagrams
- T1=T2
- ay1 = ay2
- break down in to x and y components acceleration
for train prblems,
we consider the trains as a whole, to solve for ax.
Assumptions:
- 3 FBD to find T
- no air resistance
- ay = 0
- cables weightless
- positive along acceleration
- acceleration is consistent
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