SIMPLE MACHINES || LEVER - PULLEY - INCLINED PLANE -WHEEL & AXLE - SCREW - WEDGE || COMPLEX MACHINES

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THIS VIDEO EXPLAINS ABOUT 6 TYPES OF SIMPLE MACHINES WITH MANY EXAMPLES . SIMPLE MACHINES ARE LEVER - PULLEY - INCLINED PLANE - WHEEL AND AXLE - SCREW - WEDGE . IT ALSO EXPLAINS ABOUT COMPLEX MACHINES WITH EXAMPLES. THIS SCIENCE EDUCATIONAL VIDEO IS EASY TO UNDERSTAND FOR KIDS AND CHILDREN.
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Machines come as two major kinds - Simple Machines and Complex Machines.
Simple Machines are basic mechanical devices for applying a force and doing work.it helps us to do any work with less effort.
There are 6 basic types of simple machines. they are lever , wheel and axle , pulley, inclined plane, wedge and screw.
lever.
The lever is made up of a straight rigid object like a board or a bar which pivots on a turning point called a
fulcrum. Levers make work easier by using leverage which multiplies the force. When you use a lever, you move
a smaller force a longer distance in order to lift a load a short distance.
The Parts of a Lever?
Beam. The physical lever itself made of materials such as wood, metal or plastic which can pivot or move on the fulcrum
Effort. The force that is exerted by a person or machine on a lever
Fulcrum. The point at which a lever pivots or hinges
Load. The object that is acted on by the lever.
Examples of levers include a seesaw, pliers, crowbars, and tweezers, Scissors,Nut crackers, Wheel barrow,Bottle openers.
These are classified into Three Lever Classes.
Class One Lever
In this class, the Fulcrum is between the Effort and the Load. The mechanical advantage is more if the Load is closer to the fulcrum.
Examples of Class One Levers include seesaws, boat oars and crowbar, scissors ,hammer, pliers.
Class Two Lever
In this class, the Load is between the Effort and the Fulcrum. The mechanical advantage is more if the load is closer to the fulcrum.
Examples of Class Two Levers include wheelbarrows, nut cracker, .
Class Three Lever
In this class, the Effort is between the Load and the Fulcrum. The mechanical advantage is more if the effort is closer to the load.
An example of Class Three Lever is a garden shovel, tweezers.
The Wheel and Axle.
It uses a wheel with a rod attached in the middle as an axle to help it to lift or move loads.The wheel is one of the greatest inventions in history, but it does not work without the axle.he Wheel and axle work in two basic ways.
Force applied to wheel:
A simple door knob is another great example of the wheel and axle.it will be difficult turning the axle to open
the door, we can turn the wheel instead and that does that job for us.
Force applied to axle:
A Ferris wheel is an example of force being applied to the axle. When the axle turns it results in the giant wheel turning. The wheel is much larger than the axle and covers more distance and area.
some more examples are wheels used on skateboards, cars, bus, bicycle
A pulley is simply a wheel with a groove in it, and a rope in the groove.
The groove is important because it helps to keep the rope in place. pulley is used to lift up or lower heavy objects.
With a pulley, an object to be lifted can be tied to one end of the rope, and a force is applied to the other end by pulling the rope downwards.
The downward force turns the wheel with the rope and pulls the load upwards at the other end.
pulleys are used in curtains , water well , crane and in FLAG POLE.
Inclined Plane
An inclined plane is a simple machine with no moving parts. It is simply an even sloping surface. It makes it easier for us to move objects to higher or lower surfaces, than if we lifted the objects directly upwards.
If the slope is gentle, a person has to push or pull the object over a longer distance, but with very little effort.
If the slope is steep, a person has to push or pull the object over a very short distance, but with more effort.
Examples of inclined planes include slides and ramps.
screw.
a screw is a cylinder with a head at one end and a pointed tip at the other end. More importantly, it has ridges winding around it.
The ridges around the shaft or cylinder is the thread.
The distance between the threads is called Pitch.
Nail and Screw are not the same. screw has ridges around the shaft but nail don't have ridges.examples of screws are bolts, drill bit, bottle tops, guitar tuners,and screws, bulb.
Wedge
A wedge is simply a triangular tool, often made of metal, wood, or stone .
It is thick on one end and tapers to a thin or sharp edge on the other end.
examples of wedges are nails, knives, axes . your teeth!
Simple machines were first discovered and described by Greek philosopher Archimedes.
complex machines are made up of many simple machines.
Complex machines, like trucks, CAR, or bicycles use many moving parts. They combine many simple machines such as levers, pulleys, and gears
to get work done.
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