Mass and Weight
- two related but different quantites -
Although mass and weight are two related quantities they are in fact very different ans we must stop confusing them ! Today, we are going to review each of these quantities and explainn why they are far from being identical.
Weight
In physics, weight is the force of gravity exerted on a stationary body. The weight of a body is the product of the mass of the body and the acceleration of gravity. It therefore depends on the mass of the body and the intensity of gravity (of the body's location). The weight is mesured with a dynamometer in Newton (N) and is noted Fg, while the acceleration g is expressed in N/kg. Synthesis : physical quantity that varies according to the location of the body. In addition, weight is the gravitational force with which a star attracts a body to its centre.
Mass
In physics, mass is a positive quantity. It depends on the amount of matter in a body ans is conserative, i.e it remains the same no matter where the body is located. It appears through two properties : - In static mechanics : it is a quantity that can be imediately measured by weighing ans wich allows the quantity of matter of a body to be compared to a standard mass (a standard is the materialization of a given quantity whose value is known with great accuracy). The mass is therefore directly related to the quantity of matter cantained in a body.
- In dynamic mechanics : it is a quantity that arises in the fundamental principle of dinamics, as the "resistance of matter to change in velocity". The greater the mass of a body, the greater the force to deflect its direction or the magnitude of it's velocity. This is called "inter mass". The mass is most frequantly measuredwith a balance in kilograms (unit of mass in the International System of Units / SI) and is noted m. Synthesis : positive physical quantity that does not vary according to the location of the body. Futhermore, the mass of a body is a quantity of matter of which it is made. It is meaasured in grams with a balance.
We must not confuse weight and mass : indeed, weight is a force whereas mass is a characteristic of each body, liked to its composition. The relationship between these two quantities is : Fg = m*g With "Fg" the weight in N "m" the mass in kg "g" the intensity of gravity in N/kg
MARTY Charlotte ; CAMARASA-SANCHEZ Chiara
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Transcript
Mass and Weight
- two related but different quantites -
Although mass and weight are two related quantities they are in fact very different ans we must stop confusing them ! Today, we are going to review each of these quantities and explainn why they are far from being identical.
Weight
In physics, weight is the force of gravity exerted on a stationary body. The weight of a body is the product of the mass of the body and the acceleration of gravity. It therefore depends on the mass of the body and the intensity of gravity (of the body's location). The weight is mesured with a dynamometer in Newton (N) and is noted Fg, while the acceleration g is expressed in N/kg. Synthesis : physical quantity that varies according to the location of the body. In addition, weight is the gravitational force with which a star attracts a body to its centre.
Mass
In physics, mass is a positive quantity. It depends on the amount of matter in a body ans is conserative, i.e it remains the same no matter where the body is located. It appears through two properties : - In static mechanics : it is a quantity that can be imediately measured by weighing ans wich allows the quantity of matter of a body to be compared to a standard mass (a standard is the materialization of a given quantity whose value is known with great accuracy). The mass is therefore directly related to the quantity of matter cantained in a body.
- In dynamic mechanics : it is a quantity that arises in the fundamental principle of dinamics, as the "resistance of matter to change in velocity". The greater the mass of a body, the greater the force to deflect its direction or the magnitude of it's velocity. This is called "inter mass". The mass is most frequantly measuredwith a balance in kilograms (unit of mass in the International System of Units / SI) and is noted m. Synthesis : positive physical quantity that does not vary according to the location of the body. Futhermore, the mass of a body is a quantity of matter of which it is made. It is meaasured in grams with a balance.
We must not confuse weight and mass : indeed, weight is a force whereas mass is a characteristic of each body, liked to its composition. The relationship between these two quantities is : Fg = m*g With "Fg" the weight in N "m" the mass in kg "g" the intensity of gravity in N/kg
MARTY Charlotte ; CAMARASA-SANCHEZ Chiara