Simple machines lets you trade force for distance, or the other way around. Or they change the direction of a force.
In essence it is a pulley in which the chain and the wheel cannot slip with regard to each other.
frights
A lever
frights
a hammer
The Mechanical Advantage is the ratio of the force needed to lift an object using the simple machine divided by the weight of the object
You are using a wheel and axle simple machine when you twist a doorknob. The wheel (the doorknob) rotates on the axle (the spindle), allowing you to easily open or close the door.
An airplane is not a simple machine. A lever is a simple machine. A wheel is a simple machine. Any machine that can be described by a mathematical formula is a simple machine.
my results are that simple machines work by using force and some work.
A complex machine is a machine using more than one simple machine for its operation. A bicycle is a complex machine, using a lever for steering (handlebars), wheel and axle, inclined plane (the threads on bolts), and a pulley (chain on sprockets).
the work a machine does is the work output what it takes to do the work is the work input
A compound machine combines two or more simple machines to perform work more efficiently than a single simple machine. By leveraging the advantages of different simple machines working together, a compound machine can multiply the input force or distance, making it easier to accomplish tasks that would be challenging using just one simple machine.