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5.4 Mass and Weight - University Physics Volume 1 | OpenStax

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Mass and weight are often used interchangeably in everyday conversation. For example, our medical records often show our weight in kilograms but never in the correct units of newtons. In physics, however, there is an important distinction. Weight is the pull of Earth on an object. It depends on the distance from the center of Earth. Unlike weight, mass does not vary with location. The mass of an object is the same on Earth, in orbit, or on the surface of the Moon. The equation 𝐹 net =𝑚𝑎 𝐹 net = 𝑚 𝑎 is used to define net force in terms of mass, length, and time. As explained earlier, the SI unit of force is the newton. Since 𝐹 net =𝑚𝑎, 𝐹 net = 𝑚 𝑎 , Although almost the entire world uses the newton for the unit of force, in the United States, the most familiar unit of force is the pound (lb), where 1 N = 0.225 lb. Thus, a 225-lb person weighs 1000 N. When an object is dropped, it accelerates toward the center of Earth. Newton’s second law says that a net force on an object

5.4 Mass and Weight - University Physics Volume 1 | OpenStax Skip to Content Go to accessibility page Keyboard shortcuts menu University Physics Volume 1 5.4 Mass and Weight University Physics Volume 1 5.4 Mass and Weight Contents Highlights Print Close 5.4 Mass and Weight By the end of this section, you will be able to: Explain the difference between mass and weight Explain why objects falling through the air are never truly in free fall Describe the concept of weightlessness Mass and weight are often used interchangeably in everyday conversation. For example, our medical records often show o

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