Since ancient times, humans learned to transform his little strength in a larger. This is achieved with the invention of machines. The first machines were simple systems where men and women facilitated their work, are now known as simple machines. The wheel, lever, pulley, screw, inclined plane and wedge are some simple machines. The lever and the inclined plane are the simplest of them all. Scientists believe the other machines, derivations and applications of these two.
Primitive man thanks to his intuition realized that the levers, the mechanism used in waves, paddles, etc.. they could help you make the most of your muscle strength. But it was Archimedes (287-212 BC), a scientist of ancient Greece, who succeeded in explaining the operation of the lever.
illustrated his theory with a famous phrase: "Give me a fulcrum and I will move the world", assuming they have a long enough lever could move the earth with its own forces. Archimedes
based on two principles, established the laws of the lever. Principle 1
"If you have a lever on the ends of equal weights act, the lever will be balanced by placing the fulcrum in the middle of it. "
Pincipio 2
" A weight can be decomposed into two parts acting at the same distance from the midpoint of the lever.
But ... what are really the levers?
lever is defined as a rigid bar supported at a point which applies a small force for a large force at the other end, the small force is called "power" (p) and great strength, "resistance" (R), the axis of rotation about which the lever turns is called "fulcrum" or "fulcrum" (A).
levers Using the principle of moments where one of the forces rotate the lever in one direction and the other in the opposite direction.
A variety of levers
According to the position of "power" and "resistance" with respect to the "point of support," we consider three classes of levers, which are:
1 .- In the first type the fulcrum is located between the load and the applied force. The closer the load then the force applied can be lower. It is our intuitive idea of \u200b\u200bleverage, which helps us to move a heavy load.
2 .- In the second type the fulcrum is at one end of the arm, the load is located at the closest to the fulcrum and the force applied on the remote. Thus does a wheelbarrow. Its utility is evident, the closer the load on the trolley fulcrum (wheel) is easier to move it.
3 .- In the third type, the fulcrum is at one end, but we reverse the relative positions of the load and the applied force. As the load is furthest from the fulcrum the force applied must be higher. In contrast, the load has a big move. Such are the levers that function in the joints of the arms for example.
Primitive man thanks to his intuition realized that the levers, the mechanism used in waves, paddles, etc.. they could help you make the most of your muscle strength. But it was Archimedes (287-212 BC), a scientist of ancient Greece, who succeeded in explaining the operation of the lever.
illustrated his theory with a famous phrase: "Give me a fulcrum and I will move the world", assuming they have a long enough lever could move the earth with its own forces. Archimedes
based on two principles, established the laws of the lever. Principle 1
"If you have a lever on the ends of equal weights act, the lever will be balanced by placing the fulcrum in the middle of it. "
Pincipio 2
" A weight can be decomposed into two parts acting at the same distance from the midpoint of the lever.
But ... what are really the levers?
lever is defined as a rigid bar supported at a point which applies a small force for a large force at the other end, the small force is called "power" (p) and great strength, "resistance" (R), the axis of rotation about which the lever turns is called "fulcrum" or "fulcrum" (A).
levers Using the principle of moments where one of the forces rotate the lever in one direction and the other in the opposite direction.
A variety of levers
According to the position of "power" and "resistance" with respect to the "point of support," we consider three classes of levers, which are:
1 .- In the first type the fulcrum is located between the load and the applied force. The closer the load then the force applied can be lower. It is our intuitive idea of \u200b\u200bleverage, which helps us to move a heavy load.
2 .- In the second type the fulcrum is at one end of the arm, the load is located at the closest to the fulcrum and the force applied on the remote. Thus does a wheelbarrow. Its utility is evident, the closer the load on the trolley fulcrum (wheel) is easier to move it.
3 .- In the third type, the fulcrum is at one end, but we reverse the relative positions of the load and the applied force. As the load is furthest from the fulcrum the force applied must be higher. In contrast, the load has a big move. Such are the levers that function in the joints of the arms for example.
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