Levers (11 Years Old) CIEM

8/10/2019 Levers (11 Years Old) CIEM

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LOGO

What they are and how they worknby l g v chng hotngnhthno?


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Parts of a lever

Cc thnh phncanby

LoadTitrng

EffortLctc ng

Load ArmCnh tay ncatitrng

Effort ArmCnh tay ncalc

Fulcrumimta

RodThanh cng


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How many types of Lever?

C myloinby

Class 1

Loi1

Class 2

Loi2

Class 3

Loi3


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Class 1

Loi1

Fulcrum placed between the effort andload

imtanmgialctc ngv titrng

The movement of the load is in the oppositedirection of the movement of the effort.

Chuynngcatitrngngcchiuvihngcalctc ng.

The length of the effort arm can be greaterthan, equal to or less than the length of the

load arm in a class 1 lever.

Cnh tay ncalcc thlnhn, bnghocnhhncnh tay ncatitrng


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Class 1

Loi1

trng thi thng bng,moment nghch (bn tri)bng vi moment thun(bn phi) theo cng thc

Mechanical Advantage (M.A)

Lich chc


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Class 2

Loi2

Load in between the effort and thefulcrum

Titrngnmgialctc ngv imta

The movement of the load is in the samedirection as that of the effort.

Chuynngcatitrngcngchiuvihngcalctc ng.

The length of the effort arm goes all theway to the fulcrum and is always greater

than the length of the load arm in a class 2lever

Chiudi cacnh tay ncalclunlnhnchiudi cacnh tay ncatitrng


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Example

ngdng

Wheelbarrow: Xe goong

Crowbar: X beng

Nut cracker: Kpht

Nutcracker

Wheelbarrow Crowbar


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Class 3

Loi3

The effort in between the load and the fulcrum

Lctc ngnmgiatitrngv imta

Both the effort and load are in the same direction

Lcv titrngnmtrn cng mtpha cathanh cngThe length of the load arm goes all the way to the fulcrum andis always greater than the length of the effort arm.

Chiudi cacnh tay ncatitrnglun lnhnchiudi cacnh tay ncalc


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Example

ngdng

Tweezers: Nhp

Stapler: DpghimMousetrap: BychutBroom: chiHockey stick: Gykhc cn cu

Tweezers Stapler

Mousetrap

Broom

Hockey stick


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Why use Levers?

V sao chng ta sdngnby

Mechanical advantage in lifting heavy loads, moving things agreater distance or increas

Tolich chckhi nng vt, di chuyn vt mt khong cchln hn hoc tng tc di chuynvt.


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HNG DN LP T M HNH N BY N GiNSEE SAW

BP BNH


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Sbnh xe cn

Sbnh xe cn

Vtr 24

Vtr 12


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Sbnh xe cn

Sbnh xe cn

Vtr 8

Vtr 6


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TestTh nghim S

bnhxe

Khongcchttm Sbnhxe

Khongcchttm

1 1 24 24

2 1 24 12

3 1 24 8

4 1 24 6

Complete the following table according to your previousmeasurements

insliuvo ctthch hp

Left side Right side

TEST 1


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TEST 1

Try your best to solve the exercises that follow,

writing your answers in the spaces provided

incu trlithch hpvo trng

What class is this type of lever?

nbyloig?


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TEST 2 Chncu trlitngngvihnh


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TEST 3

Write the class of each lever and complete the

little squares at the points where the effort isapplied (E), the load (L) and the fulcrum (F)

inloinby, lctc dng(E), titrng(L) v imta(F) vo trng


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TEST 3

Write the class of each lever and complete the little

squares at the points where the effort is applied (E), theload (L) and the fulcrum (F)



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TEST 3

Write the class of each lever and complete

the little squares at the points where the

effort is applied (E), the load (L) and thefulcrum (F)



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TEST 3

Write the class of each lever and complete the

little squares at the points where the effort isapplied (E), the load (L) and the fulcrum (F)

inloinby, lctc dng(E), titrng(L)v imta(F) vo trng


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Levers (11 Years Old) CIEM