Welcome Guest Search | Active Topics |

Tag as favorite
sin vs cos on inclined plane - AAMC QP 57
Tyreek_6897
#1 Posted : Tuesday, July 06, 2021 11:03:22 PM
Rank: Newbie

Groups: Registered
Joined: 7/6/2021
Posts: 0

Thanks: 0 times
Was thanked: 0 time(s) in 0 post(s)
How do determine whether to use sin or cos when you have questions asking to determine force on inclined plane? I usually guess between them, but I don't know the logic.
INSTR_Katrina_128
#2 Posted : Wednesday, July 07, 2021 5:12:20 PM
Rank: Advanced Member

Groups: Registered
Joined: 5/18/2021
Posts: 73

Thanks: 0 times
Was thanked: 0 time(s) in 0 post(s)
Hi Tyreek!

No need to guess. 😀

The force PARALLEL TO (or SLIDING DOWN) the inclined plane using SINE. (sliding = sine)

Example: https://i.stack.imgur.com/ciMDw.png

===============================

However, this question ISN'T A FORCE ON AN INCLINED PLANE! Notice that the block is sitting on a horizontal surface?

What is tricky is that the APPLIED FORCE is being applied at an angle of Θ to the horizontal. The question is basically asking "what is the HORIZONTAL component of the tension (applied) force"?

Since Θ is cosy (snuggly) with the horizontal axis, the answer is T cos Θ, or D.
Users browsing this topic
Guest (2)
Tag as favorite
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.

Clean Slate theme by Jaben Cargman (Tiny Gecko)
Powered by YAF | YAF © 2003-2009, Yet Another Forum.NET
This page was generated in 0.067 seconds.