4/6/11

Post date: Apr 06, 2011 12:51:42 PM

    • Bell ringer: A pulley system lets a farmer lift a 35 kg bale of hay up to a 7.0 m high loft in the barn. The farmer has to pull in 75 m of rope using 50.0 N of force to do this. Calculate the MA, IMA, and efficiency of the pulley system.

    • Notes - machines

      • simple machines

        • Inclined plane family

          • simple inclined plane

          • wedge

          • screw

        • Lever family

          • Simple lever

          • Wheel and axel

          • Pulley

      • Compound machines - two or more simple machines working together

      • Motors, engines, pneumatics - simple or compound machines that use an energy source other than humans (gasoline, electricity, air pressure)

      • Computers - not machines by the physics definition

  • P.210: 13-15 (due tomorrow)

  • Quiz tomorrow - work, energy, machines