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