Consider two apple pies that are identical in every respect, except that pie 1 is piping hot and pie 2 is at room temperature.
(a) If identical forces are applied to the two pies, is the acceleration of pie 1 greater than, less than, or equal to the acceleration of pie 2?
(b) Choose the best explanation from among the following:
I. The acceleration of pie 1 is greater because the fact that it is hot means it has the greater energy.
II. The fact that pie 1 is hot means it behaves as if it has more mass than pie 2, and therefore it has a smaller acceleration.
III. The pies have the same acceleration regardless of their temperature because they have identical rest masses.