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# 3.3

A wedge is a sloped surface that forces materials apart. true
A combination of fixed and moveable pulleys working together is called pulley system. true
The efficiency of such a machine is determined by multiplying the efficiencies of each simple machine. true
What is a simple machine, and what are the six types of simple machines? A simple machine does work using only one movement. They are lever, wheel and axle, inclined plane, wedge, screw and pulley.
Which factors determine whether a lever is a first class, second class, or third class lever? Where the input and output force are relative to the fulcrum.
what is a compound machine? Two or more simple machines that operate together form a compound machine.
wedge shovel, knife, axe
screw drill, bolt, light bulb
lever ramp, hill, plow
flagpole pulley
roller skates wheel and axle
crowbar lever
a levers pivot point fulcrum
a shaft that turns axle
a wheelbarrow second-class lever
how is the efficiency of a compound machine calculated? by multiplying the efficiencies
how can gears change change the size and direction of a force? Because gears of different sizes turn at different speeds.
EXPLAIN why a wedge that splits wood is an example of a compound machine. Because it is two simple machines that are operating together.
Created by: myersrei4032