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A machine is any device used to change the magnitude or direction of an applied force It is used to make tasks easier and less force-needing for humans by transferring energy from one point to another Its main advantage is that it enables a person to exert a force greater than could be exerted by using muscles alone or to apply a force more efficiently as with the pulley Machines dont always have to be complicated and intricate technological equipment as we first think of them- a simple lever is a machine The human skeleton is also a machine The four most basic and simple machines are the lever the pulley the wheel and axle and the inclined plane or ramp Simple and basic machine combinations are many times used inside more complex machines like a watch for example which makes of use or different wheels turning each other The force increase is usually at the expense of speed as the smaller force has to be sustained for longer to complete the same amount of work done For example We know that WORK DONE force x distance Keeping this formula in mind we can see that to perform the same amount of work with a decrease in the force a longer distance has to be covered thus increasing the time taken We can see this put into practice by looking at a simple block being pulled up a slope and directly upwards from the lowest pointWe can see that pushing the block up the slope uses a smaller force but covers a larger distance while the lifting of the block straight upwards uses a larger force but covers a smaller distance In both cases the total amount of work done or energy used is the same This shows that levers dont actually save any energy but do make the job significantly easier because of the diminished force requirement
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