s10.1 Some concepts about rotation 4. The orbital angular momentum of a particle Define:L=r×p=rxm Magnitude L L=rmvsin8=Pr=rp Direction: Perpendicular to the plane containing the 6∴ r and p 810.1 Some concepts about rotation Notice O L is measured with respect to the origin at O; ②unit:kgm2/s; 3 whatever the path or trajectory of a particle is straightline. curved path, closed orbital ath 5. The angular momentum of the circular orbital motion of a particle (a) Angular momentum3 4. The orbital angular momentum of a particle Define: L r p r mv r r r r r = × = × x y z m θ r r p r o ⊥r L r ⊥ p Magnitude: L = rmvsinθ = p⊥r = r⊥ p Direction: r p r r and Perpendicular to the plane containing the §10.1 Some concepts about rotation Notice: 1 is measured with respect to the origin at O; 2 unit: kg·m2/s; 3 whatever the path or trajectory of a particle is straightline , curved path, closed orbital path, …. L r 5. The angular momentum of the circular orbital motion of a particle (a) Angular momentum §10.1 Some concepts about rotation