You're on a roll — Inertia is the property of an object to resist any change in its state of motion. There are three main types of inertia: • Inertia of Rest: This is the tendency of an object to remain in its state of rest. For example, when a bus suddenly starts, passengers tend to fall backward due to their inertia of rest. • Inertia of Motion: This is the tendency of an object to remain in its state of uniform motion. For instance, when a moving bus suddenly stops, passengers tend to fall forward due to their inertia of motion. • Inertia of Direction: This is the tendency of an object to resist any change in its direction of motion. An example is when a car takes a sharp turn, passengers are pushed to the side opposite to the turn, as their bodies try to continue moving in the original straight direction. Got more? Send 'em.