Vocab: Crashing Planets

The property of matter that keeps an object moving in a straight line and at a constant speed.

• elliptical

• trajectory

• comet

• inertia

Having the shape of an oval or flattened circle

• free fall

• trajectory

• elliptical

• inertia

Any motion of a n object where gravity is the only force acting upon it.

• trajectory

• orbit

• free fall

• inertia

The path of an object moving through space.

• orbit

• inertia

• trajectory

• comet

An icy chunk of rock from a region of space beyond the orbit of Neptune.

• trajectoy

• comet

• free fall

• inertia