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Merv: We're ready for another test. Let's get started.
Engineer: Getting started isn't all that easy. After all, a car that's not moving is a body at rest And a body at rest will stay that way until an outside force gets it moving. That's another part of Newton's first law of motion.
Mini: Well, what does a car have to overcome to get moving?
Engineer: The force that keeps a car, or any body, at rest is called inertia. For the car to get started, enough force must be applied to it to overcome its inertia.
Merv: Tell us more about inertia.
Engineer: The car's inertia is due to an attractive, or pulling, force of Earth on the car. We call that the gravitational force, or simply, gravity. Merv, you weigh more than Mini, don't you? That's because you have more inertia than she does when you're both standing still. Earth's gravitational pull is stronger on you than on her.
Mini: Let's get back to the car. How does it get started?