How can i pass physics exam in 3 days?

Explanation:

you can pass the exam in 3 days by doing labouring hard, by understanding and by thinking theoretical and practising practically.

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.

since you're a real machine, your ama is always less than your ima, because you can never totally eliminate friction.