Breadcrumb Home 1D40.12 - Hammer Code Number: 1D40.12Demo Title: HammerCondition: GoodPrinciple: Center of MassArea of Study: MechanicsEquipment: Hammer Procedure: Throw the hammer into the air with some rotational motion. You should see that the hammer will rotate about the center of mass, which is indicated by the black dot on the handle of the hammer.