Question

what is the definition of inertia?
the tendency of heat to rise due to atmospheric pressure
the tendency of an object to resist a change in motion
the tendency of an object to fall to earth because of gravity
the tendency of water to flow from north to south

Explanation:

Inertia is a fundamental concept in physics. According to Newton's first law of motion, an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force. This property of objects to resist changes in their state of motion is what we call inertia. The first option about heat rising due to atmospheric pressure is related to thermal and fluid dynamics concepts, not inertia. The third option about an object falling to Earth because of gravity is related to gravitational force, not inertia. The fourth option about water flowing from north to south is related to various geographical and hydrological factors, not inertia. Only the second option correctly describes inertia as the tendency of an object to resist a change in motion.

Answer:

The tendency of an object to resist a change in motion