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Transcript of Levers
A rigid bar resting on a pivot
Used to help move a heavy or firmly fixed load with one end when pressure is applied to the other.
It is made out of a ridged object that pivots around a fulcrum (the point on which a lever rests/where it pivots)
How Does it Work?
transfers an applied force over a distance and exerting an output force on an object
increases the magnitude of the output force by sacrificing the distance the force is applied over
How to Calculate Mechanical Advantage
1.Indentify the fulcrum.
2.Identify the locations of the input and output forces.
3.Find the distance between the fulcrum and the input force (resistance arm).
4.Find the distance from the fulcrum to the output force (effort arm).
First Class Lever
1.Seesaw (also known as a teeter-totter)
3.Pliers (double lever)
4.Scissors (double lever)
Second Class Levers
2.Nutcracker (double lever)
3.The handle of a pair of nail clippers
Third Class Levers
2.Tongs (double lever) (where hinged at one end, the style with a central pivot is first-class)
4.Any number of tools, such as a hoe or scythe
5.The main body of a pair of nail clippers, in which the handle exerts the incoming force
Emily Etchegary and Jordan Nilsson
1: Mechanical Advantage:
MA= length of effort arm/length of resistance arm
Types of Levers