Is the weight of a person the same as the mass of the person?
101996
The previous answer is not quite true. Indeed they are not the same. Weight is a measure of force, whereas mass is mass.\nHowever, you do not weigh the same everywhere on earth, although you would be hard pressed to tell the difference.\nYour weight at the top of everest, for example, is less than at sea level, because the force being exerted on you by gravity is less, allbeit only by a small amount.\nAlso, weight is a unit of force, whereas mass is not.\nMy weight may be 100kg, but my mass is (approx) 980N (at sea level), so weight and mass are actually never equal
148681
Only objects of the same mass (Weight) fall at the same speed. Objects of different size (Shape) can fall at different speeds.
1041146
There is no such thing as 'true weight.' Your weight fluctuates whether you're on the mountains or in the ocean or on the moon; you can never have a true weight. However, you do have a constant mass (assuming that you didn't go on a diet or bulk up your muscles). Mass and weight are two different concepts.
829568
Mass is the amount of material in an object. Mass stays the same no matter what force is acting on the object. This makes mass different from weight, which depends on both the amount of mass and the amount of gravity
565457
Mass is a property of a physical object that quantifies the amount of matter and energy it contains. Unlike weight, the mass of something stays the same regardless of location. In relativity, the quantity invariant mass, which is closest in content to the classical idea of mass, also does not vary between single observers in different reference frames. Mass is a central concept of classical mechanics and related subjects, and also several forms of mass appear in relativistic kinematics (see mass in special relativity).\n\nThere are three different quantities called mass:\n\nInertial mass is a measure of an object's resistance to changing its state of motion when a force is applied. An object with small inertial mass changes its motion more readily, and an object with large inertial mass does so less readily. \nPassive gravitational mass is a measure of the strength of an object's interaction with the gravitational field. Within the same gravitational field, an object with a smaller passive gravitational mass experiences a smaller force than an object with a larger passive gravitational mass. (This force is called the weight of the object. In informal usage, the word "weight" is often used synonymously with "mass", because the strength of the gravitational field is roughly constant everywhere on the surface of the Earth. In physics, the two terms are distinct: an object will have a larger weight if it is placed in a stronger gravitational field, but its passive gravitational mass remains unchanged.) \nActive gravitational mass is a measure of the strength of the gravitational field due to a particular object. For example, the gravitational field that one experiences on the Moon is weaker than that of the Earth because the Moon has less active gravitational mass. \n\nAlthough inertial mass, passive gravitational mass and active gravitational mass are conceptually distinct, no experiment has ever unambiguously demonstrated any difference between them. One of the consequences of the equivalence of inertial mass and passive gravitational mass is the fact, famously demonstrated by Galileo Galilei, that objects with different masses fall at the same rate, assuming factors like air resistance are negligible. The theory of general relativity, the most accurate theory of gravitation known to physicists to date, rests on the assumption that inertial and passive gravitational mass are completely equivalent. This is known as the weak equivalence principle. Classically, active and passive gravitational mass were equivalent as a consequence of Newton's third law, but a new axiom is required in the context of relativity's reformulation of gravity and mechanics. Thus, standard general relativity also assumes the equivalence of inertial mass and active gravitational mass; this equivalence is sometimes called the strong equivalence principle.\n\nIf one were to treat inertial mass mi, passive gravitational mass mp, and active gravitational mass ma distinctly, Newton's law of universal gravitation would give as force on the second mass due to the first mass\n\n \nNewton's third law, of reciprocal actions, shows that active and passive mass are proportional. As a result they can be defined to be equal\n\nIn the SI system of units, mass is measured in kilograms (kg). Many other units of mass are also employed, such as: grams (g), metric tons, pounds, ounces, long and short tons, quintals, slugs, atomic mass units, Planck masses, solar masses, and eV/c2.\n\nThe eV/c2 unit is based on the electron volt (eV), which is normally used as a unit of energy. However, because of the relativistic connection between (rest) mass and energy, E = mc2 (see below), it is possible to use any unit of energy as a unit of mass instead. Thus, in particle physics where mass and energy are often interchanged, it is common to use not only eV/c2 but even simply eV as a unit of mass (roughly 1.783 × 10-36 kg).\n\nBecause the gravit
111372
mass is the amount of matter, weight is the force gravity exerts on an object. mass stays the same, but weight changes if you go to the moon etc.
620490
weight is measured in pounds and mass in kilograms.  Mass is independent of gravity but weight is not.  as far as them being alike i guess people commonly use them both to measure if they are fat or not.
87856
It all depends on the definition of what we call as weight.  Generally weight is defined as the force equal to the product of mass and acceleration due to gravity. By this definition the weight of an object is the same irrespective of its surrounding medium.\n\nBut often we deal with problems when an object is surrounded by some medium say air or water.\n\nIn that case we have to say that the weight in air or weight in water.\n\nBy ‘weight in air’ we mean the net force (weight in vacuum minus the upward force due to air)\n\nBy ‘weight in water’ we mean the net force (weight in vacuum minus the upward force due to water)\n\nTherefore,\n The weight in vacuum will be greater than the weight in air. \nThe weight in air will be greater than the weight in water.\n\nIf nothing is added (surrounded) to the term weight, \nWeight means weight in vacuum\n\nAnd is the same whether it is in air or water.
146781
mass = (side) x (side) x (side) or (height) x (depth) x (width)
957725
kg is a measure of mass and not weight.  Though, it often gets confused.  The mass of a person does not change unless he consume something or eject something from his body.  His mass would not change wether the elevator goes up, down or sideways.  Depends on what the question is looking for.  The most accurate answer should be: \n\n65kg x (9.81+2)m/s^2 = 767.65 N (newton).\n\nThe old weight of the person is:\n\n65kg x 9.81 m/s^2 =637.65 N\n\nIt would be ridiculous if the question asked for the weight in pounds, but here is a conversion:\n\n767.65 N x 0.2248 N/lbf = 172.56 lbf (as in pound-force, which is different from pound-mas (lbm), the common concept of measure in weight most of us are familiar with, 1 lbf = 1 lbm x 32.2 ft/s^2 )\n\nNow that I have confused everyone.  I just wonder if a physics teacher can explain it any better? lol.\n\n\nXR
157791
Seeing that im a bricklayer id have to say they weigh the same !
425701
No. You can understand the difference by going back to its source: the Newton's Second Law.\n\nF = ma\n\nThe weight of an object is the attractive force (F) exercised by the Earth on that object.\n\nAs the above equation shows, the mass (m) of an object is the constant of proportionality that links any force exercised on the object with the consequent acceleration (a).\n\nSo you see that the weight is a special case of force, that you have when a is the Earth's gravity acceleration. \n\nNow suppose you bring the same object on another planet, say Mars, where the gravity acceleration is different. Its mass doesn't change, but the weight does!\n\nThe weight of an object is an Earth accident, while its mass is a more fundamental concept because its value remains constant (at least within the non-relativistic limit, but this is another story).
759986
both will have same weight mass
820356
mass = the amount of matter, independant of gravity and in sci units measure in kg's\n\nweight= force, the downward pull on an object due to gravity, measure in N (newtons)
119352
All is clear once you understand the difference between mass and weight.\n\nIf you are not sure, look here:
345905
well...both weigh a ton, so they are equal.
315070
they are both a pound so they weigh the same