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lesson 3:3

lesson

QuestionAnswer
there area total of three types of simple machines. false
a lever consists of a bar that pivots about a fixed point called the focus. false
a wedge is a sloped surface that forces materials apart. true
which factors determine whether a lever is a first- class lever, second-class lever, or third-class lever? input force, output force, fulcrum
what is a compound machine? two or more simple machines that operate together and form a compound machine.
how do you calculate the overall efficiency of a compound machine? multiply the efficiencies of each simple machine together.
an example of a wedge your front teeth
an example of a screw bottle caps
an example of an inclined plane ramp
flag pole pulley
wedge that splits wood wedge
roller skates wheel and axle
a lever's pivot point fulcrum
a shaft that turns axle
a wheelbarrow second-class lever
what is a compound machine? when two or more simple machines that operate together to form a compound machine.
how is the efficiency of a compound machine calculated? by multiplying the efficiencies of each simple machine.
what happens to the efficiency of the overall machine as more simple machines are added to it? each simple machine decreases the overall efficiency.
Created by: royerbre4038