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 sin vs cos on inclined plane - AAMC QP 57 Previous Topic Next Topic
 Tyreek_6897 #1 Posted : Tuesday, July 06, 2021 11:03:22 PM Rank: NewbieGroups: Registered Joined: 7/6/2021Posts: 0Thanks: 0 timesWas 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. Back to top User Profile
 INSTR_Katrina_128 #2 Posted : Wednesday, July 07, 2021 5:12:20 PM Rank: Advanced MemberGroups: Registered Joined: 5/18/2021Posts: 73Thanks: 0 timesWas thanked: 0 time(s) in 0 post(s) Hi Tyreek!No need to guess. ðŸ˜€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 Î˜ to the horizontal. The question is basically asking "what is the HORIZONTAL component of the tension (applied) force"?Since Î˜ is cosy (snuggly) with the horizontal axis, the answer is T cos Î˜, or D. Back to top User Profile
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