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What is inertia?
Inertia can be defined in three ways: .
the apparent resistance to force .
the resistance of an object to a change in its motion (or lackthereof) .
the tendency of an objec…t at rest to stay at rest, and for anobject in motion to remain in motion. These are all really saying the same thing. An object with massrequires force to change its motion, or to start moving from a stationaryposition. Once the force is applied, the object will move at a constant velocity untilaffected by another force. Inertia is proportional to the mass of any object -the greater the mass, the greater its inertia. Two Examples The inertia of an object resists a change in its motion. That iswhy seat belts are used in cars. When the car turns, your body is still trying tocontinue in the original direction. If the car suddenly stops, your body stillwants to continue forward. Inertia also tries to keep a stationary object stationary. If youhave to push a broken-down car from the road, there is a tendency to resist thismovement. And a heavier car is harder to push than a lighter car, even withthe same tires. Inertia is the tendency of an object at rest to remain at restuntil some force acts to move it; also, the tendency of a moving object to continuemoving until something acts to stop it. Inertia is the property of all matter by which it remains inconstant, uniform motion until acted upon by an external force. Inertia is a measure of mass. ( Full Answer )