![]() This vehicle, which looked a lot like a dune buggy, weighed about 460 pounds on Earth. ![]() When Apollo 15 was launched from Cape Kennedy, Florida, in July 1971, it carried the first Lunar Rover. For example, the force of gravity on the moon is around that on Earth. While gravity throughout the surface of the Earth does not vary much, elsewhere, it can vary much more. Be careful not to confuse these two uses. The abbreviation for gravity, g, is the same as the abbreviation for gram. Weight changes because the force of gravity can change depending on where the object is Earth's gravity is weaker the farther away from its center you get, though throughout its surface, the difference is not really significant. ![]() The mass of an object stays constant, regardless where the object is, unless of course you add or remove mass from it. A key thing about mass is that it does not change. Mass (m) measures the amount of matter that makes up an object while weight (W) actually measures how strongly gravity (g) pulls on an object. They are related to each other as follows:Ģ.204623 pounds = 1 kilogram Mass vs weight ![]() ![]() Two common units of mass used to describe the weight of an object include the kilogram (kg), which is the base unit of mass in the International System of Units, and the pound (lb), the unit of mass in the US customary and imperial systems of measurement. Using weight to mean mass is not technically correct, but it is widely accepted.īelow are a few different types of scales that measure the weight (estimate the mass) of objects sitting on them. While they are not exactly the same, since weight can change, on Earth, gravity doesn't vary significantly, so weight and mass are directly proportional. However, "weight" is commonly used to mean mass. The scientific definition of weight is the force acting on an object, usually due to gravity, or the force that holds the object in place. ![]()
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