Apr 1e Sph4c Pulleys and Pulley Systems
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Classes of Levers: More Practice
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Transcript of Apr 1e Sph4c Pulleys and Pulley Systems
Classes of Levers: More Practice
Classes of Levers: More Practice
3rd class lever
Classes of Levers: More Practice
Classes of Levers: More Practice
1st class lever (x2)
Classes of Levers: More Practice
Classes of Levers: More Practice
2nd class lever
Classes of Levers: More Practice
Classes of Levers: More Practice
2nd class lever (x2)
Classes of Levers: More Practice
Classes of Levers: More Practice
1st class lever
Classes of Levers: More Practice
Classes of Levers: More Practice
3rd class lever (x2)
Classes of Levers: More Practice
Classes of Levers: More Practice
Classes of Levers: More Practice
Pulleys and Pulley Systems: Student Learning GoalThe student will be able to construct a system of
pulleys and determine its ideal and actual mechanical advantage (C2.7).
Pulleys and Pulley Systems
SPH4C
The Pulley
The pulley is a member of the lever family because it is a rigid object that can rotate freely around a fulcrum.
The wheel has a grooved rim in which a rope or cable can run.
A Single Fixed Pulley
A single fixed pulley (in which the fulcrum does not move) gives no mechanical advantage but changes the direction of the effort force (FE) required to lift the load force (FL).
A Single Movable Pulley
A pulley in which the fulcrum does move when the load is moved is called a moveable pulley.
There is a mechanical advantage to using this pulley.
Pulley Systems
A system of pulleys can also give you a mechanical advantage.
Pulley Systems
A system of pulleys can also give you a mechanical advantage.
The IMA will be equal to the number of support strands (i.e. strands pulling upward). This system of one
fixed pulley and one moveable pulley has 2 support strands.
Moveable Pulley: Example
What is the IMA of a single moveable pulley?
Moveable Pulley: Example
What is the IMA of a single moveable pulley?
IMA = 2
Pulley Systems: Example
What is the IMA of the pulley system at right?
Pulley Systems: Example
What is the IMA of the pulley system at right?
IMA = 3
Pulley Systems: Example
What is the IMA of the pulley system at right?
IMA = 3
Pulley Systems: Example
What is the IMA of the pulley system at right?
IMA = 3So you would expect the FE
to be three times less than the FL . . .
Pulley Systems: Example
What is the IMA of the pulley system at right?
IMA = 3So you would expect the FE
to be three times less than the FL . . .
But friction, the mass of the pulleys, etc. will increase your required FE .
More Practice
Pulley Systems Lab Activity
