Describe the net force lab and explain what the lab demonstrated

The net force acting on an object is the sum of all the force acting on it, and the net force of an object is zero. I f the forces acting on it tend to cancel each other. For example you are sit in a chair, the earth's gravity is pulling you down, but the chair is pushing you up with an equal amount of force.

Protons have a positive charge and, collectively, give an element its atomic number.

No because a circle or pie graph usually shows percentages you'd need a line graph