What happens to the metals electrical conductivity when the temperature hits up​

Temperature affects metal in numerous ways. A higher temperature increases the electrical resistance of a metal, and a lower temperature reduces it. Heated metal undergoes thermal expansion and increases in volume.

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Relation between electrical and thermal conductivity Wiedemann-FRANZ law At a given temperature the thermal and electrical conductivity of metals are proportional, but raising the temperature increase the thermal conductivity while decreasing the electrical conductivity.

Explanation:

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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.

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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.