Explanation #1: Why does the puck gradually slow down as it moves across the ice?
Here are three different students' force diagrams for the puck.
Student A
Student B
Student C
Force of
stick
Force of
friction
Force of
friction
Gradually
decreasing
force of stick
Which of these force diagrams do you think would be most appropriate
to use in this explanation? Explain your thinking.

Assume that two of the electrons at the negative terminal have attached themselves to a nearby neutral atom. there is now a negative ion with a charge -2e at this terminal. what are the electric potential and electric potential energy of the negative ion relative to the electron? the electric potential and the electric potential energy are both twice as much. the electric potential is twice as much and the electric potential energy is the same. the electric potential is the same and the electric potential energy is twice as much. the electric potential and the electric potential energy are both the same. the electric potential is the same and the electric potential energy is increased by the mass ratio of the oxygen ion to the electron. the electric potential is twice as much and the electric potential energy is increased by the mass ratio of the oxygen ion to the electron.