Study Guide: SPS8 - Work, Power & Simple Machines

Work is done when a ______ is applied to an object, causing it to move in the ______ of the force.

• force; direction

• force; opposite direction

• mass; direction

• energy; direction

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NGSS.HS-PS2-1

The formula for work is W = _____ x _____.

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NGSS.MS-PS3-5

Mechanical advantage (MA) is the ratio of ______ force to ______ force.

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

The unit of work is (a)   .

A ______ is a simple machine that consists of a flat surface tilted at an angle to reduce the effort needed to move an object.

• inclined plane

• lever

• pulley

• screw

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

Mechanical advantage is a measure of the force amplification achieved by using a tool, mechanical device, or machine. Which of the following best describes this concept?

• The ratio of output force to input force in a machine

• The speed at which a machine operates

• The energy consumed by a machine

• The size of a machine

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NGSS.MS-PS2-1

NGSS.MS-PS2-2

A simple machine can make work easier by:

• increasing the amount of work done.

• decreasing the amount of work done.

• changing the direction of the force applied.

• increasing the force required.

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NGSS.MS-ETS1-1

Why is no work done if you push against a wall that does not move?

• Because the wall is too strong

• Because no force is applied

• Because there is no displacement

• Because the wall pushes back

A pulley system helps lift heavy objects by:

• increasing the force needed to lift the object.

• decreasing the force needed to lift the object.

• changing the direction of the force applied.

• both decreasing the force needed and changing the direction of the force applied.

Identify the correct unit for each quantity: Work = ______

• Joule

• Newton

• Watt

• Pascal