RRB Group-D Model Paper 12 with answers for online practice

Center of Gravity:

• It is a point, near or within a body, through which its entire weight can be assumed to act when considering forces on the body and its motion
• under gravity. This coincides with the center of mass in a uniform gravitational field.
• It is also called the point in any solid where a single applied force could support it; the point where the mass of the object is equally balanced.
• The center of gravity is also called the center of mass.
• The concept of "center of gravity" was first introduced by the great ancient Greek physicist, mathematician, and engineer Archimedes of
• Syracuse .
• Example of Center of gravity: If we just balance the object using a string or an edge, the point at which the object is balanced is the center of
• gravity.
• Central Point is the point within a body through which a specified force may be considered to act, such as the center of gravity.
• The point, axis, or pivot about which a body rotates.
• Edge is the area where the entire object or body should be balanced. It is also known as a string.