Weight and gravity are same? Because gravity is attractive force applied by earth and weight is force applied by earth?
Answers
Answer:
The first is the definition of weight. I first understood the definition of weight from the textbook I was reading as the gravitational force that exerts on a body. From this definition, there is no difference between Fg, the gravitational force, and w , weight force.
That said, after re-reading and searching all the internet sufficiently, the definition more accurately used for weight is the gravitational force that the earth exerts on the body or "If you are on another planet, your weight is the gravitational force that planet exerts on you." Young, H. and Freedman, R. (2016). University Physics with Modern Physics (14th ed). Pearson Education, Inc, pp. 114.
With that in mind, typically weight force is a particular type of the gravitational force that refers to the gravitational force on a body (e.g. on the moon, on Mars, on Earth). If you are referring within space such as the gravitational force of Earth on the International Space Station (ISS) or an astronaut on the ISS, they are in constant free-fall, and for sake of clarity, the force causing that free-fall is just called gravitational force since there is the sensation of weightlessness. It would be a misnomer to say how much does an astronaut weigh on the ISS and more accurate to say what is the gravitational force the earth (or the ISS) exerts on the astronaut.
The same can be said of celestial bodies, such as the moon. One would not say, how much does the moon weigh. One would say, what is the gravitational force the earth has on the moon (and so forth for the Earth to the Sun and Mars to the Sun).
When being asked for the weight force, it is generally implicitly understood, it's the gravitational force of an object on the earth (or it will be specifically called out on what body and the acceleration due to gravity on that body, e.g. find the weight force of a person of 68 kg mass on the moon which has an acceleration due to gravity of 1.620ms2). When asked for the gravitational force, the 2 object's mass will be provided or the needed data to calculate their mass.
Here is a comparison at the formula/math definitions.
Weight Force:
w =mg
where m is the mass of the object and g is the acceleration vector due to gravity (e.g. has both magnitude and direction).
Gravitational Force between 2 objects:
Fg=G∗m1m2r2
where G is the gravitational constant
6.67384(80)∗10−11m3kg∗s2
and m1 is the mass of object 1 and m2 is the mass object 2 with r being the distance between the 2 objects.
If we were to calculate both values for 150 lb person at sea level, we would find that both equal 667N (rounding to 3 significant figures). To simplify the calculation of gravitational force on the Earth, Newton derived the weight force relatio
Explanation:
Answer:
The weight of an object is defined as the force of gravity on the object and may be calculated as the mass times the acceleration of gravity, w = mg. Since the weight is a force, its SI unit is the newton.
Explanation:
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