A) Explain the following terms: i) momentum

ii) closed system

iii) isolated system

iv) impulse

b) A force of 28N acts on a baseball for 0.2s. What is the impulse on the ball?

The strength or force that something has when it is moving, the strength or force that allows something to continue or grow stronger or faster as time passes, the property that a moving object has due to its mass and it’s motion. I hope one of these definitions help you out in some way!

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.