The center of mass is the point in an object or system where its mass can be considered to be concentrated. It is the average position of all the particles that make up the object.
Think of a seesaw with different weights on each end. The center of mass is like the balance point where you could place your finger and keep it perfectly balanced.
Mass: The amount of matter in an object.
Weight: The force exerted on an object due to gravity.
Torque: A measure of how effectively a force causes rotation.
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