The document discusses how a lever can be used to lift an elephant. It explains that a lever is a simple machine that rotates around a fulcrum and uses effort and load forces. When the fulcrum is closer to the load, less effort is required. The document then gives an example calculation to determine the length of the rod needed for a man weighing 250N to lift an elephant weighing 50,000N when the fulcrum is 3m from the elephant. Through lever calculations, it is determined the length would need to be 6m.
3. Machine: Machine is an engineering, device used to change the magnitude or direction of an applied force. Lever is one of the simple machine.
4. Lever: A lever consists of a beam which rotates around a pivot point or fulcrum . It is acted upon by two forces: an effort exerted by muscles and a load due to an object’s resistance. When the fulcrum is in the centre, the effort must be equal to the load.
5. When the fulcrum is moved closer to the load, less force is required to lift the weight. Levers allow a decrease in force but required movement through a greater distance The EFFORT x its distance from the FULCRUM The LOAD x its distance from the FULCRUM =
6. 50000 N 250 N Questions: A man of weight 250N wants to lift an elephant of weight 50000N. The fulcrum is at a distance of 3m from the elephant. What should be the length of the rod from the fulcrum to the man to lift the elephant. 3 m ?
7. The EFFORT x its distance from the FULCRUM The LOAD x its distance from the FULCRUM = 50000 N 250 N 3 m ? 250 x Effort = 50000 x 3 250 x Effort = 150000 Effort = 150000 /250 = 600 m
