Question

when heat is transferred by direct contact (conduction), what happens as the heat moves from the warmer substance to the cooler substance? the particles in the cooler substance move slower and slower as it gains heat the particles in the cooler substance move faster and faster as it gains heat

Explanation:

Heat transfer by conduction involves the transfer of thermal energy from a warmer substance to a cooler one. In the context of particle - based explanations (a common model in physics for understanding heat and temperature), temperature is related to the average kinetic energy of particles. When a cooler substance gains heat (thermal energy), its particles gain kinetic energy. Kinetic energy is related to the motion of particles (\(K = \frac{1}{2}mv^{2}\), where \(m\) is the mass of the particle and \(v\) is its velocity). As the kinetic energy (\(K\)) of the particles in the cooler substance increases (because it is gaining heat), and assuming the mass (\(m\) of the particles remains constant (in a non - nuclear, non - chemical reaction context), the velocity (\(v\)) of the particles increases.

Answer:

the particles in the cooler substance move faster and faster as it gains heat