86.1 The gravitational force @Gravitational mass and inertial mass F(r)=-G Mm r m-gravitational mass F(r)=ma(r) nertial mass Free-fall body experiment G GM =a Al 86.1 The gravitational force m GM = f=m BIB Experimental result: a=a that means AG=BG=.=k=constant nt BI choose suitable unit, k=1, mg=m,3 §6.1 The gravitational force 4Gravitational mass and inertial mass r r Mm F(r) G ˆ 2 = − r m –gravitational mass F(r) m a(r) r r = ′ m ′--inertial mass A AI A F = m a 2 r m M F G AG A = 2 r GM m m a AI AG A = ⋅ Free-fall body experiment: §6.1 The gravitational force B BI B F = m a 0 2 r m M F G BG B = 2 r GM m m a BI BG B = ⋅ Experimental result: aA=aB that means = = = k = constant m m m m BI BG AI AG L choose suitable unit, k=1, mG=mI