10 The diagrams show some examples of where the force of friction acts: Underneath each diagram
. .
i. write down if it would be useful for the force of friction to be large or small.
ii. explain why you made your choice.​

stands for electromotive force and it is measured in volts. despite its name, it is not actually the force in the sense of being a "pushing" or "pulling" (not measured in newtons).an equation that relates emf,  ℰ,  to a battery's terminal voltage, v, current, i, and internal resistance, r, is    ℰ = v + irin this case, the emf can be interpreted as a voltage—a difference in electric potential.i would not say that it would be considered an energy. if emf can be defined as the energy/work per a unit charge from a battery or other electric source, then it is not strictly energy.

What does the start look like

It really doesn't matter for any of the questions that you've listed.