Physics for IGCSE & O level - The Earth In Space (Section 3 - No. 39)

What is the relationship between internal energy and the motion of particles?
Internal energy only includes the kinetic energy of particles.
Internal energy only includes the potential energy of particles.
Internal energy considers both kinetic and potential energies of particles.
Internal energy is unrelated to the motion of particles.

Explanation

Internal energy is the sum of kinetic and potential energies which includes particle motion.

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