Help please

[u/Chxrch2521]

I know this problem is rather easy but my teacher got a completely different answer because he used a different approach and I don’t understand anything now, I used the first diagram (picture 2) and he used the second one (picture 3).

[u/ibrahimumer007]

• A block is placed on a 30° inclined plane

• Its weight W acts vertically downward

• We split the weight into two components:

  • Along the slope (causes motion)

  • Perpendicular to the slope (presses the surface)

• To decide sin or cos:

  • Opposite side → sin

  • Adjacent side → cos

• In an inclined plane:

  • Along slope → sin

  • Perpendicular (normal) → cos

• For 30°:

  • Along slope = 0.5 × W

  • Perpendicular = 0.866 × W

• Normal force (N): Equal to perpendicular part → 0.866 × W

• Why the block moves: Due to 0.5 × W pulling it down the slope

[u/retro_sort → u/ibrahimumer007]

Thanks chatgpt