fifth grade science
DESCRIPTION
Fifth Grade Science. Levers. Lever- a stiff bar that rests on a middle support. Parts of a Lever. Load- the weight or the resistance that needs to be overcome. Effort- the force applied to move a load. Lever- stiff bar. Fulcrum- pivot point (fixed). - PowerPoint PPT PresentationTRANSCRIPT
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Fifth Grade Science
Levers
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Lever- a stiff bar that rests on a middle support
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Load- the weight or the resistance that needs to be overcome
Lever- stiff bar Fulcrum-
pivot point (fixed)
Effort- the force applied to move a load
Parts of a Lever
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Levers can be classified into three different types or classes.
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First Class Levers
In a Class 1 lever, the fulcrum is between the effort and the load.
EFL
LFE
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First Class Levers
Examples of common tools (and other items) that use a type 1 lever include:
ItemNumber of Class 1 Levers Used
see-saw a single class 1
lever
hammer's claws a single class 1
lever
scissors 2 class 1 levers
pliers 2 class 1 levers
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Second Class Levers
In Class 2 levers, the load is between the fulcrum and the effort.
ELF
FLE
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Second Class LeversExamples of common tools that use a type 2 lever include:
Item Number of Class 2 Levers Used
stapler a single class 2 lever
bottle opener a single class 2 lever
wheelbarrow a single class 2 lever
nail clippers Two class 2 levers
nut cracker Two class 2 levers
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Third Class Levers
In Class 3 levers, the effort is between the fulcrum and the load.
LEF
FEL
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Third Class Levers
Examples of common tools that use a type 3 lever include:
ItemNumber of Class 3 Levers Used
fishing rod a single class 3 lever
tweezers Two class 3 levers
tongs
Two class 3 levers
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Which Type of Lever Am I?
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Class 2 Lever!!
Fulcrum Load
Effort
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Class 1 Lever!!
FulcrumLoad Effort
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Class 3 Lever!!
Fulcrum
Load
Effort