What is the Full Form of CM in physics?

Safalta expert Published by: Saumya Sahoo Updated Wed, 14 Sep 2022 01:48 AM IST

Full Form of CM

In physics, CM stands for the center of mass distribution in space (sometimes called the equilibrium point) and is the distinct point where the weighted relative positions of the distributed masses sum to zero. This is the point where force can be applied to produce linear acceleration without angular acceleration. Mechanics calculations are often simplified when formulated in terms of the center of gravity. This is a virtual point at which the entire mass of the object can be assumed concentrated in order to visualize its motion. In other words, the center of mass is the particle equivalent of a particular object for which Newton's laws of motion apply. For a single rigid body, the center of mass is fixed with respect to the body and is at the center of mass if the body is of uniform density. The center of mass can be outside the body, as is the case with hollow or open-shaped objects like horseshoes for the distribution of separate bodies, for planets in the solar system, the center of mass may not correspond to the position of individual members of the system. The center of mass is a useful reference point for mechanical calculations involving mass distributed in space, such as linear and angular momentum of planetary bodies and rigid body dynamics.

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In orbital mechanics, planetary equations of motion are formulated as mass points located at the center of mass. A center of mass frame is an inertial frame in which the center of mass of the system is at rest with respect to the origin of the coordinate system.  In addition, you can also check out our free General Awareness E-book- Download now for all competitive exams. 

Importance of center of mass

  • The center of mass of a system is a single point at which a uniform force acts on an object.
  • Finding the center of mass of an object is important because it helps solve the dynamics problem that describes the motion of complex and oddly shaped objects.
  • When doing the calculations, we assume that all the mass of the oddly shaped object is concentrated in a small object at the center of mass. This small object is known as a point mass.

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What is the Full Form of CM in physics?

In physics, CM stands for the center of mass distribution in space (sometimes called the equilibrium point) and is the distinct point where the weighted relative positions of the distributed masses sum to zero. This is the point where force can be applied to produce linear acceleration without angular acceleration.

What are the important of CM ?

  • The center of mass of a system is a single point at which a uniform force acts on an object.
  • Finding the center of mass of an object is important because it helps solve the dynamics problem that describes the motion of complex and oddly shaped objects.
  • When doing the calculations, we assume that all the mass of the oddly shaped object is concentrated in a small object at the center of mass. This small object is known as a point mass.

Describe centre of gravity.

The center of gravity of a body is the point at which the net torque due to gravity vanishes. If the gravitational field can be considered uniform, the centroid and centroid are the same. However, for satellites in orbit around the planet, if no other torque is applied to the satellite, small changes in the gravitational field (gradient) between near (strong) and far (weak) the planet will cause the torque tends to occur. Align the satellite so that its longitudinal axis is vertical. In such cases, it is important to distinguish between centroid and centroid. A torque is applied due to the horizontal displacement between the two. Note that the centroid is a fixed property of certain rigid bodies (such as slosh or no joints). On the other hand, the center of mass may also depend on orientation in a non-uniform gravity setup. In the latter case, the center of mass is always slightly closer to the main attractor than the center of mass, so changing the orientation of the target will change the position of the target. 

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