1. Law of Inertia - objects are lazy --> objects will remain their motion unless there's an extreme force
2. Force, Mass, Acceleration (F = ma)
3. For every action there's an EQUAL and OPPOSITE reaction
Equilibrium:
Assumptions: - F = 0
- no friction
- no air resistance
- no acceleration
Incline:
Assumptions: - positive is in the direction of acceleration
- no air resistance
Pulley:
Assumptions:
- pulley is frictionless
- rope is frictionless
- no air resistance
- 2 systems --> 2 FBD
- T1 = T2
- ay1 = ay2
Train:
Assumptions:- 3 FBD to find T
- no air resistance
- ay = 0
- cables weightless
- positive along acceleration
- acceleration is consistent
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