Class 3 Lever
Class III levers have mechanical advantage less than one. Why are they then used?
To obtain gain in speed
To obtain loss in speed
It acts as force multiplier
It is used in raising a load
State the kind of lever which always has the mechanical advantage less than 1.
Both B and C
- Human arm
- Fire tongs
The lever for which the mechanical advantage is less than 1 has the :
(a) fulcrum at the midpoint between the load and effort.
(b) load between the effort and fulcrum.
(c) the effort between the fulcrum and load.
(d) load and effort acting at the same point.
Class III levers have the mechanial advantage less than 1. Why are they then used ?
Explain why the mechanical advantage of the class III lever is always less than 1.
State the class of levers and the relative positions of load (L), effort (E) and fulcrum (F) in (a) a bottle opener, and (b) sugar tongs.
State the kind of lever which always has the mechanical advantage less than 1. Draw a labelled diagram of such a lever.
Draw a labelled sketch of a class III lever. Give one example of this kind of lever.