Paper 1 · energy and units
Graphs below were obtained from four different experiments. Which shaded area does not have units of energy?
Apower vs time
Bforce of air resistance vs distance
Cpotential difference vs charge
Dgravitational field intensity vs time
Explanation: Power×time = energy, force×distance = energy (work), pd×charge = energy. Gravitational field intensity×time has units (N/kg)(s) which is not energy.
ZIMSEC Physics Paper 1, November 2009, Q2
