Conceptual Physics Notes Chapter 10
Center of Mass
The average position of the particles of mass which constitute the object.
For uniform objects, the center of mass will lie at the geometric center…
for non-uniform objects, the center of mass could lie almost anywhere.
Center of Gravity
The average position of the weight distribution of the object.
For most objects, the center of mass and center of gravity are at the same
An extended object acts as though the entire weight of the object is
located at the center of gravity position!
Locating Center of Gravity
The center of gravity of any freely suspended object lies directly beneath
the point of suspension. (Balancing the object is a simple way of locating the
center of gravity.)
The center of gravity may be a point where no mass exists. (The center of
a hollow basketball for example.)
An object is “stable” (will not tip over by itself) if you can drop a vertical
line downward from the center of mass position and the line passes into the
ground within the perimeter of the support base of the object.
Objects with a low center of gravity and a wide support base are most
Day 1 (Pages 136-141) - 1, 2, 4, 5, 6, 7, 8, 9, 25, 28, 33
Day 2 (Pages 142-146) - 11, 12, 15, 16, 17, 19, 20, 21, 22, 29, 32