Principle

Using a block and tackle as an example, the students should
observe that the force, which is necessary to lift a given
load, decreases in direct correlation with the number of
pulleys.


They should determine how much larger the weight force of
the load is compared to the force which is necessary to
maintain equilibrium, and whether there is a connection between
this and the number of pulleys of a block and tackle.

They should investigate whether the load distance differs from
the force distance and form the product
F × s.
Additionally, they should be able to say whether the number of
pulleys is important here, too.