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Vocabulary words for unit 7 in the FL 5th grade Science Fusion book.

force

a push or a pull

gravity

the force that pulls objects toward earth

friction

resistance felt between objects in contact

balanced forces

forces equal in size, opposite in direction

unbalanced forces

forces not opposed by another

velocity

speed of motion

acceleration

process of speeding up, increasing velocity

inertia

tendency of a body in motion to remain in motion

dwarf planet

a spherical celestial body revolving about the sun, similar to a planet but not as large

asteroid

a large rock or minor planet found in outer space

comet

a tailed mass of ice and dust orbiting the sun

astronomy

the study of planets and other objects in space

star

the study of planets and other objects in space

universe

all of the space, matter, and energy that exists

galaxy

stars, gas and dust held together by gravity

solar system

a group of planets orbiting one star

planet

large object that revolves around the sun

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