# Shared Flashcard Set

## Details

Chapter 10: Center of Gravity AP Problems
Chapter 10: Center of Gravity AP Problems
4
Physics
07/28/2012

Term
 Compare the center of gravity of an object to its center of mass. Do these occur at the same location in the object?
Definition
 yes, as long as g is constant over the mass distribution. The center of gravity of an object is the point at which the entire weight may be considered to be concentrated. If g is constant over the entire mass distribution then the center of gravity coincides with the center of mass.
Term
 A system consists of two masses m1 and m2 at positions X1 and X2. What is the Xcm, the position of the center of mass of the system?
Definition
 The center of mass is at xcm = (m1x1 + m2x2)/m1m2
Term
 A system consists of N particles, with masses m1, m2, ....., mn and positions r1, r2, ....., rn. What is rcm, the position of the center of mass of the system?
Definition
 The center of mass is at rcm = Σ (miri)/Σ mi   summed over i ranging from 1 to N.
Term
 T or F. The center of mass of a system of particles moves as if all the mass of the system were concentrated there and all the external forces were acting on that point.
Definition
 True. This is Newton's second law as it applies to a system of particles.
Supporting users have an ad free experience!