Question

choose the best answers.
2.1) __ is the kinetic energy of the atoms and molecules inside an object.
a. heat energy
b. thermal energy
c. electric energy
2.2) __ the _ molecules vibrate, the more thermal energy an object has.
a. faster
b. slower

Explanation:

2.1)

To solve this, we recall the definitions of each energy type. Heat energy is the transfer of thermal energy, electric energy is related to electric charges, while thermal energy is the kinetic energy of an object's atoms and molecules. So we identify the correct option based on this definition.

We know that thermal energy is related to the kinetic energy of molecules. Faster - moving (vibrating) molecules have more kinetic energy, so the more thermal energy the object has. Slower molecules would mean less kinetic energy and thus less thermal energy. So we choose the option that fits this relationship.

Answer:

B. Thermal energy

2.2)