Simple Machines - Pulley, Wheel And Axle, Screw, Wedge
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00:00hi kids today we will learn about some more simple machines so let's get
00:07started kids we know a machine is any strain is any structure that makes our
00:15work easier our work takes lesser time and lesser energy if we use some
00:23machines for it and here is another simple machine which is called a pulley
00:30now let's see what is a pulley and how it makes our work simpler a pulley is a
00:38wheel that rotates around a stationary axle where the axle is a rod that
00:47passes through the center of the wheel the outer rim of the pulley is groove to
00:54to accommodate a rope or chain
01:00one end of the rope is attached to an heavy object which we want to lift and
01:06the other end of the rope is pulled through the system of pulley like this
01:14this system of pulley makes it easier to lift the object as the person can pull
01:21down the rope more easily than lifting the heavy object a common example is a
01:29flagpole where flag is attached to the one end of the rope and the other end of
01:35the rope is pulled to the flag reaches the top now let's learn about another
01:41simple machine which is a wheel and axle this is a wheel attached to an
01:49axle and the axle is a rod that goes wheel
01:56this lets lets the wheel turn the wheel and axle are used for making moving
02:04things all the vehicles are made using the wheel and axle a wheel and axle
02:13helps to move objects the faster the axle is turned the faster the wheel
02:19spins examples bicycle bicycle wheels are attached to the axle and we move the
02:29axle with paddles and the faster we move the axle the faster the wheels move
02:36or the cycle moves in every vehicle we move the axle to move the wheels which
02:44in turn move the vehicle let's see some examples roller skates are made up of
02:53wheels and axles they are machines because they help people move faster so
03:01can find a wheel and axle used almost everywhere now let's learn another
03:07simple machine a screw screw is a simple machine that can fasten objects a screw
03:18is an incline fine plane wrapped around a pole which holds things together or
03:24lifts materials a bolt jar lid are also examples of screws screws can be found
03:34on jar lids light bulbs now let's learn another simple machine which is a wedge
03:42a wedge is a tool or a simple machine that consists of two inclined planes
03:50inclined at some angle making a pointed edge and the pointed edge is used to do
03:58some kind of work like tightening securing or holding or splitting things
04:05apart I just move objects apart by being forced under or between them here
04:13are some uses of the shape an axle blade a kitchen knife a push pin a nail a fork
04:25a saw axe heads door stops are examples of a wedge a nail secures things a wedge
04:37under a door keeps the door from moving so kids now we learned a lot of many
04:45types of simple machines now you may go ahead and take a quiz to learn more bye
04:52bye
04:55you