Reading Assignment: Al l of Ch. 7. Ch. 4 sections 1, 2, 3.

Today's lecture continues the study of forces and associated accelerations of simple mechanical systems. To date we have studied three systems.
(1) An object sitting, unmoving on a horizontal plane with no forces applied to it other than the force of gravity. (1)We see that in this case there is no movement of any kind.
(2) The same object, subjected to an applied horizontal force where the plane on which it sits is frictionless. (2) In this case, there will be movement in the direction of the applied horizontal force with acceleration equal to the applied force divided by the mass of the object.
(3) The same object in (2) but on a plane with friction. (3) In this case there will be horizontal motion if the applied horizontal force can overcome the force of friction. On overcoming the force of friction.
In today's lecture, we review this material, consider come concrete examples and begin to move on to the application of Newton's Laws to other physical systems. In particualar, objects suspended by ropes and wires.
Link for the Day: Fiske Planetarium
Questions or comments should be addressed to Mike Ritzwoller at ritzwoller@phys-geophys.colorado.edu 

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