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Levers

A lever is a rigid straight or bent bar which is capable of rotating about a fixed axis. The position of the axis of rotation is called the fulcrum.

Mechanical Advantage of a Lever
 
 
Description: 63777.png
 

Description: 66614.png
 

Inclined Plane We have seen people using an inclined plane for loading lorries (Figure 6.5). A force which is much smaller than the weight of the object is used. In this case, the MA is always greater than 1.
 
 
Description: 63834.png (in an ideal case without friction),
 

Description: 66634.png

Figure 6.5
 

where W is the weight of the object, h is the height of the lorry, P is the force applied in the direction indicated to move the object from the bottom to the top of the plank and L is the length of the plank over which the object is moved.




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