physical properties physical properties can physical property physical protection physical protection of nuclear material physical prototypes physical prowess physical proximity physical punishment physical punishment of children physical qualities physical quality physical quantities physical quantity physical reaction physical reactions physical reality physical realm physical reason physical reasons physical records physical recovery physical recreation physical rehabilitation physical relations physical relationship physical relationships physical relaxation physical release physical remains physical removal physical representation physical requirements physical research physical resemblance physical resistance physical resource physical resources physical response physical responses physical rest physical restraint physical restraints physical restrictions physical results physical resurrection physical retail physical return physical risk physical risks physical safety physical sales physical samples physical science physical sciences physical scientists physical sectors physical security physical security measures physical self physical sensation physical sensations physical sense physical senses physical separation physical server physical servers physical setting physical shape physical shock physical shop physical shops physical side physical significance physical signs physical silver physical similarities physical single physical situation physical size physical skill physical skills physical society physical space physical spaces physical specifications physical specimen physical sport physical stability physical stamina physical standards physical state physical states physical status physical stimulation physical stimuli physical storage physical store physical stores