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Transcript of SIMPLE MACHINES
Wheel and axle
-A simple machine consisting of an axle that is attached to a wheel, it has grooves and is turned by a cord or a chain.The first known use of the wheel and axle was in 1759.Wheels and axles make work easier by decreasing the amount of mechanical energy needed to oppose gravity, it also helps stop friction on a sliding body. it decreases the amount of work that a human has to do.
ex: weights,door knobs, pencil sharpener, ferriswheel
A wheel with a grooved rim around which a cord passes. It changes the direction of a force applied to the cord and used on a bicycle a wheel. pulley is a simple machine that makes work easier. It allows a smaller amount of force to be needed to complete the work. The pulley helps to reduce friction on the rope, making the work go faster.
Like screws, wedges are really a kind of inclined plane, but they are so useful that people give them their own category. A wedge is two inclined planes back to back against each other.
ex:fork, door stopper, knife
An inclined plane is a flat surface tilted at an angle, with one end higher than the other. It is used as an aid for raising or lowering a load. The inclined plane is one of the six classical simple machines defined by Renaissance scientists. It is used to make work easier by limiting the amount of work you have to do.
-A simple machine used to help move a heavy object , there are three types , first class , second class and third class levers. Levers are created for those that need to lift objects that can be very heavy. By having a lever it reduces the weight of the object needed for lifting and the amount of work.
First-class levers have the fulcrum placed between the load and the effort
ex: seesaw, crowbar, and balance scale.
Second-class levers have the load between the effort and the fulcrum.
ex: wheel-barrow , nut cracker, bottle-opener
Third-class levers have the effort placed between the load and the fulcrum.
ex:hammer acts as a third-class lever when it is used to drive in a nail, human forearm
A fixed pulley is attached to something that does not move. The pulley makes life easier by changing the direction the force and limiting the amount of work you have to do.
Ex:flag pole, Another example of a fixed pulley is the winch on a tow truck as it's fixed to the truck rather than the load.
Movable pulleys are attached to the object being moved so it does not change the direction of the force it just increases for but also allows to increase the distance over which the input is exerted.
Ex:elevators,zip lines,weight training machines
Block and Tackles
When a fixed pulley and a movable are joined or used together it creates a system called a block and tackle.
A compound machine is a non-motorized device that changes the direction or magnitude of a force. In general, a compound machine can be defined as one of the simplest mechanisms that provide mechanical advantage.
Ex:scissors, bicycle, ceiling fan, can opener
By: Mario E. & Montrez D.