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In my opinion it should be something like this.|dw:1444613597106:dw|
My question is: Should there be Fg? I believe yes. I forgot to write it down, so I want to make sure. Please explain. Thank you
Also please explain how can FAx = FN = 0 N ?
Yes, Fg would be part of the diagram. Gravity and friction balance the vertical component of the applied force, while the normal force (FN) balances the horizontal component of the applied force (FAx). You know the horizontal forces must be balanced (i.e. Fnet = 0 N) because the eraser isn't accelerating into or away from the board. In this case, it might be easier for you to think of FN as a reactive force according to Newton's third law, although even conventional normal forces (e.g. due to gravity) are a consequence of this law. Simply put, the board pushes back on the eraser with whatever force FAx applies to prevent the eraser from going through the board. That means you can't define FN as μmg, because the force is not due to gravity - it's due to a force you're applying. But you don't need to worry about that, because all you need to do here is draw the free body diagram!
I've just noticed you have an upward acceleration in your diagram, so the vertical forces do not balance. If you had to do a calculation, the expression would be something like: Fnet=ma=FAy-f-Fg Where Fnet (ma) is the net vertical force that produces the acceleration, a, labeled in the diagram, FAy is the vertical component of the applied force, f is the friction, and Fg is gravity!
Long time no see my friend! lol It was last year you were helping me with physics 11 and chemistry 11. Now physics 12 :) How are you doing with your degree in university?
Good to see you too! Glad you decided to stick with physics (and chemistry?)! It's been a pretty busy summer for me so I wasn't around here too much, but it's paid off and the thesis is really coming along! Anyways if you have any other questions feel free to tag me - I'll try to be around more often!
Yes, I am going to study engineering at university. Good luck with university and exams!
Good that you're sticking with physics then! And no exams for me...I'm a grad student lol. Already have a Bachelor's degree.
Nice :D all those hard work paid off. Go for masters, never stop.