The difference between two opposing forces is called force

Unbalance force

Explanation:

Unbalanced force creates a difference between two force moving in opposite direction. some of the causes of the unbalance forces is friction amd air drags

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when insulating materials rub against each other, they may become electrically charged . electrons , which are negatively charged, may be 'rubbed off' one material and on to the other. the material that gains electrons becomes negatively charged. the material that loses electrons is left with a positive charge.