Great Clock of Westminster - used to get to the train on time, wedges and screws - examples of modified incline planes, third class - which lever has the effort in the middle, gears - modified wheel and axle system, second class - which lever has the resistance in the middle, none - which machines can produce more work than is put into them, screw - a light house staircase is an example of which simple machine, wheel and axle - a pulley is an eample of which simple machine , wheelbarrow - an example of a second class lever, in the center - where is fulcrum of a wheel located, nail clippers - example of a thrid class lever, effort - which arm of a second class lever is longer, work - force exerted over displacement, first class - a see-saw is which type of lever, joule - SI unit for work, torque - the turning force of a level, watt - SI unit for power, less than one hundred percent - efficiency is ______, simple machine - devices that help make work easier, in the middle - where would the effort of the tweezers be located, the weight - what part of a the pulley is considered the resistance, the rope - what part of the pulley is considered the effort, count the number of threads - how do you know how much work a screw requires,

Physical Science Chapter 7

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