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Simple Machines Lever, Wheel & Axle, and Pulley
As you learned in the last section, a   machine helps you do work by changing the amount or direction of the force you apply.   Machines help to make work easier. An eggbeater, a bolt, and a fishing pole all make use of simple machines. There are six basic kinds of simple machines: the inclined plane, the wedge, the screw, the lever, the wheel and axle, and the pulley.   Would you call any of these items a machine?
Levers ,[object Object],[object Object],[object Object],[object Object]
How It Works ,[object Object],[object Object],[object Object],[object Object],[object Object]
Mechanical Advantage   ,[object Object],[object Object],[object Object]
[object Object],Calculating Mechanical Advantage
[object Object],[object Object],IMA =  Distance from fulcrum to Input force Distance from fulcrum to Output force
Different Types of Levers   ,[object Object],[object Object]
First-Class Levers ,[object Object],[object Object],[object Object],[object Object],The fulcrum is located BETWEEN the input and output forces
Second-Class Levers ,[object Object],[object Object],Output force BETWEEN input force and fulcrum.
Third-Class Levers ,[object Object],[object Object],Input force BETWEEN output force and fulcrum.
[object Object],[object Object],[object Object],[object Object],[object Object],Mental Quiz
Wheel and Axle   ,[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object]
How It Works – Applying force to the wheel:   ,[object Object],[object Object],[object Object],[object Object]
How It Works – Applying force to the axle: ,[object Object],[object Object],[object Object],[object Object],[object Object]
In a riverboat paddle wheel, the axle turns the wheel. The output force is less than the input force but it is exerted over a longer distance.
Mechanical Advantage   ,[object Object],[object Object],[object Object]
Practice Problem ,[object Object],[object Object]
Mental Quiz ,[object Object],[object Object],[object Object],[object Object],[object Object]
Pulley  ,[object Object],[object Object]
How It Works   ,[object Object],[object Object],[object Object]
How does a pulley make work easier? ,[object Object],[object Object],[object Object],[object Object]
Types of Pulleys   ,[object Object],[object Object],[object Object]
[object Object],[object Object]
[object Object],[object Object]
 
[object Object],[object Object],[object Object],[object Object],[object Object],Mental Quiz

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Lever,wheel&axle,pulley

  • 1. Simple Machines Lever, Wheel & Axle, and Pulley
  • 2. As you learned in the last section, a machine helps you do work by changing the amount or direction of the force you apply. Machines help to make work easier. An eggbeater, a bolt, and a fishing pole all make use of simple machines. There are six basic kinds of simple machines: the inclined plane, the wedge, the screw, the lever, the wheel and axle, and the pulley. Would you call any of these items a machine?
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  • 17. In a riverboat paddle wheel, the axle turns the wheel. The output force is less than the input force but it is exerted over a longer distance.
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