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Unit 4 Lesson 3

Vocabulary Lesson 3

TermDefinition
machine any device that helps people do work by changing the way work is done.
machine there are 6 simple machines
Examples of simple machines levers, wheels and axles, pulleys, inclined planes, wedge and screw
input force This is the force you apply to a machine through a distance. The work that you do on a machine is called work input.
output force This is the force a machine exerts (applies) on an object. The work done by the machine on an object is called work output.
mechanical advantage Comparison of output force and input force.
mechanical advantage equation MA = output force / input force
lever A rigid board or bar that rests on a pivot point, called a fulcrum. The lever moves an object called a load.
fulcrum Fixed point on a lever.
FLE Acronym to remember the class of lever
1st class lever The fulcrum is in the middle
2nd class lever The load is in the middle
3rd class lever The effort/output force is in the middle
wheel and axle A large circle that rotates around a smaller circle. Often, turning the wheel turns the axle.
pulley This is a wheel on an axle. A rope usually runs around the wheel to change the direction of a force.
inclined plane A flat surface higher at one end than the other. It takes less force to move a heavy object up vertically if you move it along an inclined plane.
wedge A pair of inclined planes that move. They have one thick end and one thin end. They are used to cut and split items.
Screw An inclined plane that is wrapped in a spiral around a cylinder.
Created by: user-1824896
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