Friday, June 29, 2012

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Important Question from Simple Machine

1)Why are winding roads made on the hills?
Winding rads are made on the hills because winding roads are the form of inclined plane having longer
distance and makes our work easier my magnifying force.


2)Why is the efficiency of a simple machine is
 always less than 100%?
When the output work is equal to the input work,but some part of the input work is lost in overcoming friction,the efficiency of a simple machine is always than 100%.


3)Why is it easier to apply force downward?
It is easier to apply force downwards because the force is applied influence the gravity.


4)Why is the blade of a metal cutter shorter than that of scissors used by tailors?
In metal cutter the effort distance is greater. Metals are very hard. In order to cut the metals we need more energy and effort.If the effort distance is greater than load distance there  will be magnification of force and the metals would easily could cut.So  the blade of a metal cutter shorter than that of scissors used by tailors.


5)How does a wedge work?
When we apply effort the sharp end passes inside the material and cut the things.In this way wedge works.


6)How does wheel and axle work?
Wheel and axle is a co-axial two cylinder .the ropes
are wound around the wheel and the axle.The ropes are wound in opposite direction.The effort is applied in the big cylinder and load is lifted by a small cylinder. When the rope is wound around the wheel is pulled downward,the load wounded around the axle is raised upward.


7)Why is the mechanical advantage(MA) more in movable pulley?
The mechanical advantage is more in a movable pulley because it moves up and down changing its position. Due to which ED is greater than LD which helps in magnification of applied effort. 


8)What is the method used to increase the mechanical advantage of a inclined plane?
There is only one method to increase the mechanical  advantage of a inclined plane that is increasing the length of slope which increases of mechanical advantage of an inclined plane.   




          

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