lecture12

lecture12 - Phys 2101 Gabriela Gonzlez dP Fnet = dt dL net...

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1 Phys 2101 Gabriela González 2 No forces, no linear momentum: conservation of linear momentum. No torques, no angular momentum: conservation of angular momentum. total linear momentum total angular momentum F net = d P dt τ net = d L dt

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2 3 F net = d P dt = d M v com ( ) dt = M d v com dt = M a com d L dt = τ net = I α = I d ω dt = d I ( ) dt P = M v com L = I 4 L = I
3 5 A 4.0 kg particle moves in an xy plane. At the instant when the particle's position and velocity are r = (2.0 i + 4.0 j ) m and v = -4.0 j m/s, the force on the particle is F = -3.0 i N. At this instant, determine: (a) the particle's angular momentum about the origin, (b) the particle's angular momentum about the point x = 0, y = 4.0 m, (c) the torque acting on the particle about the origin, and (d) the torque acting on the particle about the point x = 0, y = 4.0 m. 6

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lecture12 - Phys 2101 Gabriela Gonzlez dP Fnet = dt dL net...

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