The structure and the importance of the levers

The levers

The levers are the most common simple machines which they help man to perform heavy tasks easily . They were first described in 260 B.C , The liver is affected by an effort force and a resistance force , and  It is a rigid bar ( straight or curved ) that rotate around a fixed point called fulcrum .

The structure of the lever 

The liver consists of :

  1. A resistance force which is the force that resulted from the weight of the body that we want to move .

  2. An effort force which is the force that exerted by a person to equilibrate  the resistance .

  3. The fulcrum which is a fixed point , where the bar rotates around .

    The strucure of levers
    The lever consists of a resistance force , an effort force and fulcrum .

Examples on levers

Stapler , Manual broom , Crowbar , Seesaw , Scissors , Bottle opener , Nutcracker , Ice or sweet holder and Wheelbarrow .

The importance of levers 

  1. The levers increase the force because they save the exerted effort by using the small force to make the great effort as moving the heavy load . 

    Examples : crowbar , bottle ( soda water ) opener , nutcracker and wheel barrow .

  2.  They increase the distance  , where some levers allow the exerting force for a small distance to move an object for a longer distance .

    Examples  : The manual broom , If your hand moves a small distance at the upper part of the manual broom , the lower part will move a longer distance .

  3. They avoid dangers as they are used to pick up the hot , cold and poisonous materials . Examples : Ice holder and coal holder ( coal tongs ) .
  4. They increase the speed of the objects that we affect on  

    Examples : Hockey bat .

  5. They move the force from one place to another . 

    Examples : The force of your hand on the manual broom moves from one place to another to collect the garbage without bending .

  6. They have the accuracy in performance as they are used to pick up very small object . 

    Example : Tweezers .

You may also like...

Leave a Reply

Your email address will not be published. Required fields are marked *

Human Verification *