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