Stabroek News Sunday - - WEEKEND MAGAZINE -

Hello Boys and Girls, Did you have a good week? Did you have an ex­cit­ing first week at school? Please be fo­cused on your work. Work hard and do well. This is a spe­cial year for you, the year of your Na­tional As­sess­ment to which you are look­ing for­ward. Re­vi­sion is key to your suc­cess. Be ready for school to­mor­row. En­sure that ev­ery­thing is in or­der. Have a good term.

Last week we looked at pul­leys. Do you re­mem­ber what we found out? Check your­self. i. What is a pul­ley? ii. De­scribe a pul­ley. iii. Name at least two places where pul­leys can be found. iv. Draw a fixed pul­ley. Draw a move­able pul­ley. This week we will in­ves­ti­gate an­other sim­ple ma­chine, the wheel and axle.

The wheel is a great in­ven­tion. We can hardly do with­out it. The wheel by it­self, how­ever, is not a sim­ple ma­chine. A wheel by it­self is sim­ply a roller. Maybe the idea of a wheel came about from rolling logs along the ground many years ago. The wheel and axle has been around for some 7,000 years.

The wheel is part of a sim­ple ma­chine called the wheel and axle. The axle is a smaller wheel fit­ted tightly in the larger wheel. It works along with the larger wheel.

Ev­ery time you turn a door­knob you are us­ing a wheel and axle. If there were no knob on the rod that goes through a door, it would be dif­fi­cult to open the door. The knob makes it eas­ier to work the latch.

The knob is a wheel. The rod is an axle. The wheel and axle work to­gether to open the door. A wheel and axle is used in many ma­chines. The wheel and axle helps is to do work in many ways. This sim­ple ma­chine makes it easy to turn things and to move things. The wheel is at­tached to the axle so that these two parts ro­tate to­gether. Here a force is trans­ferred from one to the other.

Do you know what a wind­lass is? If you don’t, please find out be­fore mov­ing on.

A wind­lass is a kind of wheel and axle. It has a hor­i­zon­tal axle for haul­ing or hoist­ing. A wind­lass The prin­ci­ple of the wind­lass Mak­ing a wheel and axle At­tach the small wheel to one end of the rod and the large wheel to the other. At­tach a weight or load to the axle.

Now turn one wheel com­pletely around. Ob­serve the dis­tance through which your load is moved. Turn the other wheel com­pletely around and also ob­serve the dis­tance through which it is moved. You will find that whether the small wheel or the big wheel is used the dis­tance is the same. Ex­per­i­ment with your wheel and axle as much as you would like to.

Ex­per­i­ment­ing with your wheel and axle Large wheels are used on a wheel and axle to make work easy. Sci­en­tists have found that the larger the wheel, the eas­ier the work. Large trucks, for ex­am­ple, have big steer­ing wheels. The large steer­ing wheel makes it easy for the driver to guide the truck. It would be quite dif­fi­cult to get a truck around a cor­ner with a small steer­ing wheel.

Try to iden­tify places where the wheel and axle can be found and iden­tify them. Did you check you egg whisk and all those knobs that you turn? Do you see how sim­ple ma­chines help to make work eas­ier and im­prove the qual­ity of our lives? Here are a few ques­tions for you. 1 Name five classes of sim­ple ma­chines. 2 Place X near to each cor­rect ex­am­ple of a sim­ple ma­chine. a. pul­ley._______________ b. wheel.________________ c. scis­sors________________ d. wheel and axle___________ e. step­s___________________ f. see­saw__________________ g. drink open­er_______________ _____________,_________________,_____________ are all exam3

ples of lever. 4 State three func­tions of sim­ple ma­chines. 5 Which sim­ple ma­chine does one usu­ally find on a flag pole? 6 Name at least six wheel and axles. 7 Study the pic­tures of the wheel and ax­els below. Dis­cuss them with

your friends.

Next week,. we will look at In­clined Planes and Wedges. Un­til then, good­bye, Boys and Girls. Re­vise! Re­vise! Re­vise!

Early man rolling a log

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