2. Write "PE" or KE" next to the types of energy gravitational
sound
chemical
nuclear
radiant
thermal
elastic
electrical

Gravitational- PE
Sound- KE
Chemical- PE
Nuclear- PE
Radiant- KE
Thermal- KE
Elastic- PE

Any object's resistance to change in its motion is called inertia. inertia is directly proportional to mass of the object, such that an object which has more mass will also have greater inertia compared to an object with lesser mass. thus, it is in fact the  mass of an object which determines its resistance to change in motion.