Inertia and Mass
A: These three concepts of inertia, mass, and weight are interconected. Intertia can be defined by Newton's first law, which states that "an object. It has been said that mass is a measurement of inertia. We can illustrate this mathematically using force, momentum, and even energy. Momentum describes . Inertia is the resistance, of any physical object, to any change in its velocity. This includes changes to the object's speed, or direction of motion. An aspect of this.
Since initial publication, Newton's Laws of Motion and by inclusion, this first law have come to form the basis for the branch of physics known as classical mechanics.
Kepler defined inertia only in terms of a resistance to movement, once again based on the presumption that rest was a natural state which did not need explanation.
It was not until the later work of Galileo and Newton unified rest and motion in one principle that the term "inertia" could be applied to these concepts as it is today.Experiment : relationship betweeen inertia and mass ( hubungan antara inertia dan jisim)
In fact, Newton originally viewed the phenomenon he described in his First Law of Motion as being caused by "innate forces" inherent in matter, which resisted any acceleration. Given this perspective, and borrowing from Kepler, Newton attributed the term "inertia" to mean "the innate force possessed by an object which resists changes in motion"; thus, Newton defined "inertia" to mean the cause of the phenomenon, rather than the phenomenon itself.
However, Newton's original ideas of "innate resistive force" were ultimately problematic for a variety of reasons, and thus most physicists no longer think in these terms.
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As no alternate mechanism has been readily accepted, and it is now generally accepted that there may not be one which we can know, the term "inertia" has come to mean simply the phenomenon itself, rather than any inherent mechanism.
Thus, ultimately, "inertia" in modern classical physics has come to be a name for the same phenomenon described by Newton's First Law of Motion, and the two concepts are now considered to be equivalent. Relativity[ edit ] Albert Einstein 's theory of special relativityas proposed in his paper entitled "On the Electrodynamics of Moving Bodies" was built on the understanding of inertia and inertial reference frames developed by Galileo and Newton.
While this revolutionary theory did significantly change the meaning of many Newtonian concepts such as massenergyand distanceEinstein's concept of inertia remained unchanged from Newton's original meaning in fact, the entire theory was based on Newton's definition of inertia. However, this resulted in a limitation inherent in special relativity: In an attempt to address this limitation, Einstein proceeded to develop his general theory of relativity "The Foundation of the General Theory of Relativity,"which ultimately provided a unified theory for both inertial and noninertial accelerated reference frames.
However, in order to accomplish this, in general relativity, Einstein found it necessary to redefine several fundamental concepts such as gravity in terms of a new concept of "curvature" of space-timeinstead of the more traditional system of forces understood by Newton. The result of this is that, according to general relativity, inertia is the gravitational coupling between matter and spacetime.
Even in a situation without gravity astronauts on a spacewalka massive object will still be harder to accelerate than a small object an astronaut will have to apply more force to a bowling ball to accelerate it to 10 mph than to a tennis ball. The larger the mass, the more resistant to changing its state of motion which is also why a large truck uses much more gasoline than a small car.
The Relationship between Inertia and Mass
Mass also determines the strength of its mutual gravitational attraction to other bodies you may not realize that you are attracting the earth towards you, just like the earth is attracting you towards it--you are attracting the earth towards you, but the earth is so much more massive than you that all we can notice is you being pulled towards the earth, not vice-versa.
The SI unit meaning the standard, international metric unit of mass is the kilogram kg. Mass is a property of atoms mainly the protons and neutronsso atoms with different numbers of protons and neutrons will differ in mass in other words, a block of lead or gold will have more mass than a block of aluminum that is the same size.
Mass is not the same as weight, even though we often calculate an object's mass by measuring its weight with a scale, rather than comparing it directly with known masses.
An object on the Moon would weigh less than it does on Earth because of the lower gravity, but it would still have the same mass. Mass as a Measure of the Amount of Inertia All objects resist changes in their state of motion. All objects have this tendency - they have inertia. But do some objects have more of a tendency to resist changes than others? The tendency of an object to resist changes in its state of motion varies with mass.
Inertia and Mass
Mass is that quantity that is solely dependent upon the inertia of an object. The more inertia that an object has, the more mass that it has. A more massive object has a greater tendency to resist changes in its state of motion.
Suppose that there are two seemingly identical bricks at rest on the physics lecture table.
Yet one brick consists of mortar and the other brick consists of Styrofoam. Without lifting the bricks, how could you tell which brick was the Styrofoam brick? You could give the bricks an identical push in an effort to change their state of motion.
The brick that offers the least resistance is the brick with the least inertia - and therefore the brick with the least mass i. A common physics demonstration relies on this principle that the more massive the object, the more that object resist changes in its state of motion.
The demonstration goes as follows: