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 Goal
The 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 = 3
So 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 = 3
So 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