85.5 applications of Newton's law Choose the ground as the reference frame: For block of mass m a +a MG an=a+aM a’- a cos6 sing F=mosin@=mam=naam cose)(3) F=N-mgcosB=mam=-maM sine (4) 85.5 applications of Newtons law 「F=Nsin=Man M F=0-Mg-Ncos0=0(2) rF=mosin@=mant=ndad-am cosO)(3) F=N-mgcose=mamy = -maM Sing (4) N sin 0= Ma F=mg@=mamk=mla-ay cose) (3) F=N-mgcos6=mam =-maM sing(4) 1616 m y x Choose the ground as the reference frame: mG mM MG a a a r r r = + am a aM r r r = ′ + a M r a ′ r am r θ θ sin cos my M mx M a a a a a = − = ′ − N r W r For block of mass m ( ) cos sin (4) sin cos (3) θ θ θ θ y my M x mx M F N mg ma ma F mg ma m a a = − = = − = = = ′− §5.5 applications of Newton’s law ( ) cos sin (4) sin cos (3) θ θ θ θ y my M x mx M F N mg ma ma F mg ma m a a = − = = − = = = ′− ( ) cos sin (4) sin cos (3) θ θ θ θ y my M x mx M F N mg ma ma F mg ma m a a = − = = − = = = ′ − sin M (1) Fx = N θ = Ma cos 0 (2) sin (1) = − − = = = θ θ F Q Mg N F N Ma y x M M: m: §5.5 applications of Newton’s law