- #1
isukatphysics69
- 453
- 8
Homework Statement
Homework Equations
f=ma
The Attempt at a Solution
( i have put numerous different forces into the answer box and nothing worked. i was just taking a screenshot of problem here)
Edit: never mind about kinetic friction with wall i just saw that there is no friction with wall.
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netforceavertical = Fpah - mg - fstatic = 0
netforcebvertical = Fpba - mg - fstatic = 0
acceleration is equal to 0 for both boxes and velocity upwards so the pushing force is greater than mg, mg for box A is greater than mg for box B , not sure where the frictional forces between boxes would rank here but i know they would be equal from Newtons third law since both boxes are accelerating upwards at constant speed. the static frictional force between the two boxes are equivalent. There will also be a kinetic frictional force between the box B and the wall which would be negative so i think that would rank after the static frictional forces between the boxes. not sure if i am doing this correct