Newton's first law of motion is also known as the law of inertia. What does inertia mean? A. It means the tendency to keep moving if a body is moving.
B. It means the tendency to stop if stopped.
C. It means the tendency to keep going in the direction that a body is moving.
D. It means all of the above.

A

Explanation:

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.