Question

says that an object at rest will stay at rest and an object in motion will stay in motion with a constant speed and direction unless acted on by a force. orbital motion why do earth and the moon remain in orbit? newton concluded that inertia and gravity combine to keep earth in orbit around the sun and the moon in orbit around earth. you can see how this occurs in figure 3. reading check apply concepts underline the definition of inertia. then, describe an example of your own that shows inertia.

Explanation:

The definition of inertia in the text is "an object at rest will stay at rest and an object in motion will stay in motion with a constant speed and direction unless acted on by a force". An example of inertia is when a car suddenly stops, and the passengers inside tend to lurch forward because their bodies want to continue moving at the previous speed due to inertia.

Answer:

Underlined definition: "an object at rest will stay at rest and an object in motion will stay in motion with a constant speed and direction unless acted on by a force". Example: When a car suddenly stops, passengers lurch forward.