Gears (Characteristics - Gearing Up & Gearing Down) - video Dailymotion

Edu-Primes

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00:00hi kids today we will learn what are gears so let's start kids gears are

00:10wheels with teeth gears can be of any size very small to very big gears can be

00:20made up of plastic or metal and remember gears always works in pairs gears always

00:31have teeth on them and teeth of one gear interlock with the teeth of the other

00:37gear so they are called meshed with each other and many gears can be joined with

00:44each other and when more than two gears are joined together we call it a gear

00:51train gears turn on the axle which in turn turns the wheel of the object to be

01:00moved so gears transfer forces and motion from one object to another and

01:09our work easier and faster gears can also change the speed and direction of

01:17the moving object driver driver is the first gear that starts the movement in a

01:26gear train gear wheels are mounted on axles and an axle is connected to some

01:37power source like it can be pedals in a bicycle that turns the axle connected to

01:44gears axle can be connected to some motor that runs the axle attached to the first

01:52gear or the driver gear and then driver gear turns the next mesh gear which can

02:00be attached to some other axle which is required to be moved gears can change the

02:08speed as well as the force of a machine let's see how when two gears of the same

02:17size mashup each gear turns at the same speed and there is no increase or

02:24decrease in speed and force but when a larger gear turns up a smaller gear the

02:33smaller gear turns up faster but with lesser force as a larger gear has more

02:43teeth and when it turns a smaller gear the smaller gear has to turn around much

02:51faster but with lesser force for example if a gear with 40 teeth turns up a gear with 20 teeth

03:01the gear with 20 teeth will move with twice the speed to move along with the 40 teeth gear but

03:09its force will be lesser than that of a bigger gear and this is what we call as gear up to

03:17increase speed example in the case of a bicycle with gears let's see what happens the paddles

03:31are attached to the driver gear and through paddles we crank the driver gear which in turn

03:40turns up the gears in the rear wheel and there are multiple gears in the rear wheel for various

03:47speeds like speeding up and speeding down let's see how does it happen when the driver gear

03:56cranks up a much smaller gear it runs faster and so is your cycle that is we gear up and when the

04:08driver gear using your pedals drives a larger gear in the rear wheel it moves slower and so

04:19is your cycle and this is what we call as gearing down that is the driver gear drives a larger gear

04:29it is gearing down and when the driver gear turns a smaller gear it is called gearing up so let's

04:39revise it all in our cycle the driver gear is attached with the pedals and using the pedals

04:46we drive the driver gear and when the driver gear turns up a smaller gear the cycle runs faster and

04:54it is known as gearing up and when the driver gear turns a larger gear the cycle runs slower

05:02and we call it as gearing down for example if a gear with 20 teeth turns up a gear with 40 teeth

05:12the gear with the 40 teeth will move with half the speed to move along with the 20 teeth gear

05:20and this is what we call as gearing down and gearing down decreases the speed remember gearing

05:34up gives the gear more speed but lesser force and gearing down gives the gear less speed but more

05:44force this is why when you start a car or any bike you have to start the engine from still so

05:54you need more force so lowest gear is used and when you just need speed the higher gear is used

06:04one more example if you want to ride up a hill you will need more force but less speed so you

06:14will drive a cycle on a lowest gear so that it has more force to climb up the hill gears can change

06:23the direction of movement too there are different types of gears and each gear is for different

06:33purposes gears differ from each other in the way teeth are arranged the types of teeth the way

06:42axles are put together and also the angles at which the teeth meet we will learn about each

06:50gear in our next assignment now you may go ahead and take a quiz to learn more bye

Gears (Characteristics - Gearing Up & Gearing Down)

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