lecture11

# lecture11 - Phys 2101 Gabriela Gonzlez Our definition for...

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1 Phys 2101 Gabriela González 2 Our definition for torque produced by a given force F about a point P as τ = F r sin θ allows us to add up torques only when the forces are all in the same plane. We now define torque as a vector, so we can add up the torques produced by arbitrary forces about a point P: In this way, the torque is also a vector, and has magnitude and direction. τ = r × F

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2 3 The angular momentum of a particle with respect to a point is defined as : The angular momentum of a system of particles is the sum of the angular momenta of each particle. = r × p 4 For a single particle, F=ma can also be written as… Torque and angular momentum about any point (but the same point!) F net = d p dt τ = r × F = r × d p dt = d dt r × p ( ) d r dt × p = d dt
3 5 No forces, no linear momentum: conservation of linear momentum. No torques, no angular momentum:

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## This note was uploaded on 12/01/2011 for the course PHYS 2101 taught by Professor Grouptest during the Fall '07 term at LSU.

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lecture11 - Phys 2101 Gabriela Gonzlez Our definition for...

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