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Created for Albert.io. Copyright 2016. All rights reserved.
A block of mass $m$ is pushed by a force of magnitude $F$, which acts at an angle of $\theta$ to the horizontal, as shown above.
The magnitude of the normal force between the block and the surface is
$ mg+F\cos\theta $
$ mg-F\cos\theta $
$ mg-F\sin\theta $
$ mg+F\sin\theta $