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Problems Why used $\cos\theta$ for $\text{y}$ axis or, gravitational force?

Force is perpendicular to the surface. And, green color "rod" is parallel to the surface. So, $$F = N - mg\cos \theta=0$$ Reference

posted 3y ago by deleted user

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#1: Initial revision by (deleted user) · 2021-08-17T09:41:20Z (over 3 years ago)

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![picture](https://physics.codidact.com/uploads/rcMFVkJ1zPUk5ZTkTzVdTBbi)

Force is perpendicular to the surface. And, green color "rod" is parallel to the surface. So, $$F = N - mg\cos \theta=0$$

[Reference](https://www.youtube.com/watch?v=TC23wD34C7k)

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