The diagram above shows a metal disk of weight 1.0 N resting on an index card that is balanced on top of a glass. What is the no
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In order to find the average speed we will use the formula
now here we know that distance from one edge to other edge is given as
now in order to find the average speed as per the formula above we need to know the time taken from one edge to other edge
so using above equation
here time can be found just by using the photo gates
If the photo gate will measure the time interval from one position to other then it will help to find the average speed
The system in the problem can be assimilated to a simple lever. The mechanical advantage (MA) of a lever is
where
is the distance of application of the input force with respect to the fulcrum, and 
the distance of the output force from the fulcrum.
In our problem, MA=5.5 and
. So we can find the input distance:
where
In our problem, MA=5.5 and