Advertisements
Advertisements
Question
The lever for which the mechanical advantage is less than 1 has :
Options
Fulcrum at mid-point between load and effort.
Load between effort and fulcrum.
Effort between fulcrum and load.
Load and effort acting at the same point.
Advertisements
Solution
Effort between fulcrum and load.
Reason:
Levers, for which the mechanical advantage is less than 1, always have the effort arm shorter than the load arm.
APPEARS IN
RELATED QUESTIONS
Which class of lever will always have MA > 1 and why?
The following belong to which class of lever?
A pair of scissors
The following belong to which class of lever?
Wheelbarrow
The following belong to which class of lever?
Knife
Draw a labelled sketch of a second class lever. Give one example of such a lever.
When we want to use a machine as a force multiplier, which class of lever should we preferably use? Give a simple diagram of such a lever.
The diagram below shows a lever in use.
(i) To which class of lever does it belong?
(ii) If FA = 40 cm, AB = 60 cm, then find the mechanical advantage of the lever.
What is a lever?
The diagram shows the use of a lever.
- State the principle of moments as applied to the above lever.
- Which class of lever is this? Give an example of this class of lever.
- If FA = 100 cm, AB = 90 cm, calculate the minimum effort required to lift the load.
A crowbar of length 100 cm is used to lift a load of 5 kgf. It has its fulcrum at a distance of 20 cm from the load. Calculate:
(i) the mechanical advantage of a crowbar and,
(ii) the effort applied at the other end.
