Chapter 6: Work and Machines
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22 Terms
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Efficiency
________: a measure of how much of the work put into a machine is changed into useful output work by the machine.
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Gear
A(n) ________ is a wheel and axle with the wheel having teeth around its rim.
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Energy
________ is always transferred from the object that is doing the work to the object on which the work is done.
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Screw
Like the ________, the wedge is also a simple machine in which the inclined plane moves through an object or material.
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Wedge
________: an inclined plane with one or two sloping sides.
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Wheelbarrow
A(n) ________ is a second- class lever.
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Car Jack
A(n) ________ is an example of a machine that increases an applied force.
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Mechanical Advantage
________: The ratio of the output force to the input force.
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Output Work
The ________ is the product of the output force and the distance over which that force is exerted.
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System of Pulleys
A(n) ________ can change the direction of the input force and make the output force larger.
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Power
________ is the rate at which work is done.
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Input Work
The ________ is the product of the input force and the distance over which the input force is exerted.
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Lever
________: a bar that is free to pivot or turn around a fixed point.
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Work
the energy transferred when a force makes an object move
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Power
the amount of work done in one second
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Machine
a device that makes doing work easier
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Input Force
force that is applied to the machine
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Output Force
The force applied by the machine
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Mechanical Advantage
The ratio of the output force to the input force
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Screw
an inclined plane wrapped in a spiral around a cylindrical post
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Wedge
an inclined plane with one or two sloping sides
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Compound Machine
Two or more simple machines that operate together