distingush between mass and weight? ??
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Answer:
In common usage, the mass of an object is often referred to as its weight, though these are in fact different concepts and quantities. In scientific contexts, mass is the amount of "matter" in an object (though "matter" may be difficult to define), whereas weight is the force exerted on an object by gravity.In other words, an object with a mass of 1.0 kilogram weighs approximately 9.81 newtons on the surface of the Earth, which is its mass multiplied by the gravitational field strength. The object's weight is less on Mars, where gravity is weaker, and more on Saturn, and very small in space when far from any significant source of gravity, but it always has the same mass.
The mass of an object is a measure of the object's inertial property, or the amount of matter it contains.
The weight of an object is a measure of the force exerted on the object by gravity, or the force needed to support it.
The pull of gravity on the earth gives an object a downward acceleration of about 9.8 m/s².
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