(secret government class. but desperate.) to properly access a time vortex. what must you first do to the temporal

Before accessing the vortex, you must remove any dust, grime, grease or other deposits from the rift, using a good quality detergent and mild abrasive, and then you must dry it thoroughly.  Finally, a thin coating of off-white latex or baby powder must be applied uniformly to all visible parts of the rift's inner surface, and allowed to air-dry.  Only then is the rift available for access.  

If the process is rushed, or if unauthorized individuals should foolishly attempt to access the vortex before the temporal rift is properly prepared, then their haste and impatience would be almost certain to rend the fabric of the space-time continuum.  They would have to go around with torn fabric after that, and everyone would laugh at them.  

i would say the answer is food.

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the box does not move because you need to use a force greater than 300 n. you are only using 50 n. it needs to at least be 301 n for the box to move because then it is an unbalanced force and it will move the way that the greater force is pushing it. if you use only 300 n it will be a balanced force and will not move because the force you are exerting on the   box is the same as its force.

hope this !

im sorry if i went too in depth, i am going to include a link to a video on khan academy that will explain this.   hope that you like the video and that it explains more in detail to you.

that is the link.