The people in the United States use the standard units in the ________________ system, like inches, pounds, and ounces.

Scientists (all over the world) use standard ________________ units. The ________________ system is based on units of ten.

_______________ describes the number of unit squares that cover a surface.

_______________ describes the number of cubes that fit inside an object.

_______________ is the mass of matter in a given space.

Which has the greater density, a cork or a rock?

An object floats when its density is less than the liquid or gas in which it is placed.

• True

• False

Weight and mass are really just the same.

• True

• False

________________ measures the amount of gravity between an object and the planet.

Because the Moon’s gravity is one-sixth that of Earth, an object on the Moon weighs 6 times what it does on Earth.

• True

• False