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Pete789
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Homework Statement
A regular house door has 3 forces acting on it.At the moment the door is open by 35 deg. Let's say two children are pushing on a door and mum is on the other side pushing back
1/ at 0.05m is 50N acting directly perpendicular to the door
2/ at 0.07m is 50N acting at right angles to the door frame
3/ At 0.1m is an opposite direction force (clockwise[mum]from the other side of the door of 100n acting (as in case 2) perpendicular to the door frame or wall.
Homework Equations
What is the sum of forces??
The Attempt at a Solution
My attempt is as followsSummation sign:?::: =(50N) (0.05m) + (50N) (0.07 cos 35Deg) - (100N) (0.1 cos 35Deg)
I am working of Moavini page 264.
I am essentially asking if my equation is correct in that i have SUBTRACTED the last force as it opposes the first two - am i right?? I subtract because the is clockwise not anti clockwise
Thanks ahead every body... keen engineering student... Peter