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# WA Dynamics question 9

## Question

I'm having trouble with question #9

for a it's just a simple normal force question with a block on an angle. So I did the usual mgcos(angle) = Fnormal and it didn't work.

for b I used Fhor - mgsin(angle) = ma, solved for the acceleration and it also didn't work.

I'm I missing something here?

## Recommended Posts

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Don't forget, in this problem there's also a force pushing the block up the incline.  So your equation to find FN would look more like:

$\sum {{F_y} = {F_N} - mg\cos \theta - {F_{app}}\sin \theta \to {F_N} = mg\cos \theta + {F_{app}}\sin \theta }$

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Ok thanks!

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