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Class Notes: Basic Physics I
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Introduction to Physics
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Centre Of MassIntroduction:
Centre of mass is a unique point where the weight of different distributed points all add up to
zero. We can also say that at the center of mass the masses are thought to be concentrated. It is
also called the balancing point of the body. The center of mass is mostly of rigid body as they
don’t chance there shape spontaneously. It lies along the central axis (the axis of symmetry) and
faithfully follows the equation of a parabola. For example, a person is spinning a ball on his
fingers. As we know that there isn’t any flat surface on the ball, but how? The center of mass
answers this question that the person is applying he force on its center of mass which allows him
to cancel the net value of weight and hence cause the ball to stand on a single finger. The force
of the finger is directly interacting with the center of gravity and making an equation in which
the net force on the ball is ought to be zero. center of mass can also be of a set of masses.
Suppose there are two masses m1 and m2 joint together through a rod. There center of mass will
be as follows:
Where m1 and m2 are the masses and x1 and x2 are the center of masses of the respective
masses. The result of this formula will determine the position of the rod on x-axis where the net
force will be zero or else called the center of mass.
Now in this research study we will discuss certain things about the center of mass which are as
follows:
How can we calculate the center of mass?
Role of center of mass.
, CENTRE OF MASS
Determination of the center of mass:
if we were to done to see the effect work out a body middle of mass, we can make use of
weight forces on the body to do so. This can be done primarily because of the fact that the
middle of mass is the same as the middle of serious air in the parallel weight field near the
earths top. in addition, the middle of mass of a body with an axis 1 of balance of parts, same
on 2 sides and unchanging measure of space between parts will be placed on this axis. in the
same way, the middle of mass of a going round in circles body in roller form having
unchanging measure of space between parts will have its middle of mass on the axis 1 of the
body in roller form we talk about a spherically like in size body of unchanging measure of
space between parts then its COM is at the middle of the range. If we talk about it in a
general Context, for any balance of parts, same on 2 sides of a body, its middle of mass will
mostly be a fixed point of that balance of parts, same on 2 sides
System of particle:
The word system of very small bits means a well-outlined group of a greatly sized number of
very small bits that may or may not act between, along with each other or are connected to
each other. They may be true, in fact very small bits of stiff bodies in translational motion.
The very small bit which acts between, along with each other make a request force on each
other. These forces of common (to 2 or more) effect on one another between the tiny bit of
the structures are called the inside force of the structure.
These inside forces at all time currently be in existence in sets of 2 of similar size and inverse
directions. Excluding internal forces external forces should also act on every or few of the
very little bit. At this point the word external force means a force that is stand-in on slightly
one particle, that's blanketed withinside the system through a few different frames for
exterior of the structure.
pg. 1
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