- #1

lazyguy91

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## Homework Statement

**2. Homework Equations + questions**

1) Normal Force

when considering mg as the vertical force,

mg = N cos θ

however, when considering N as the vertical force,

N = mg cos θ

note: θ is the same due to opposite angle

which equation is correct?

2) Acceleration down the slope due to gravity (frictionless)

a = g sin θ

why can't I use the originally given θ?

e.g. sin θ = g/a

a = g/sin θ

why must I use the derived θ instead of the one between the horizontal and the inclined place?

where are my mistakes? Please reply as soon as possible. Thanks