center of mass
nounUK /ˌsentər əv ˈmæs/
US /ˌsentər əv ˈmæs/
The balance point of an object, where it feels like all its weight is gathered.
You can balance a ruler on your finger at its center of mass.
OTHER MEANINGS
2. In physics, the average position of all the mass in a body or system.
The center of mass of the Earth and Moon lies inside the Earth.
3. In math, the mean position of all the points in a shape.
The center of mass of a triangle is where its three medians meet.
4. The point where a force applied causes no rotation.
Pushing exactly at the center of mass makes the box slide without spinning.