Moments And Levers P
Gbogbo ọrọ náà
Try to shut a heavy door by pressing on it a centimetre from the hinges. You will push until your arm aches and the door will barely shift. Move your hand out to the handle, use a fraction of that effort, and the door swings closed. Nothing about the door has changed and nothing about your strength has changed. What changed is the distance, and distance is the second half of every turning problem in physics.
This lesson gives you the quantity that measures a turn: the moment of a force, worth force multiplied by perpendicular distance, measured in newton metres. You will use it to balance a beam by setting the clockwise turns against the anticlockwise ones, to work out an unknown force or an unknown distance from that balance, to predict the exact moment a crate or a bus stops leaning and starts falling, and to explain how a crowbar lets a pair of hands move a boulder that no pair of hands could ever lift.
Ebumnobi
- The turning effect of a force is called the moment. The relationship between the moment, M, turning force, F, and perpendicular distance, d, from the point where the force is applied to the pivot is: M = F ×d
- If an object is not turning, the total clockwise moment must be exactly balanced by the total anticlockwise moment about any pivot. Students should be able to calculate the size of a force, or its distance from a pivot, acting on an object that is balanced.
- If the line of action of the weight of an object lies outside the base of the object there will be a resultant moment and the body will topple. Examples should include vehicles and simple balancing toys.
- Simple levers can be used as force multipliers.
Maapụ uche
E seela isiokwu a ka ị hụ otu echiche si ejikọta.
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Akwụkwọ Ọmụmụ
Ndetu Nkuzi Zuru Ezu di na Ngwa Green Bridge
Nweta ngwa Green Bridge CBT na ekwenti gi ma o bu kompiuta maka ulo akwukwo IGCSE zuru oke: akwukwo ule ndi gara aga, usoro nyocha, eserese uche, kaadi omumu na nkuzi olu.
Nnyocha Ọmụmụ
Ekele diri gi maka imecha ihe karịrị na Moments And Levers P. Ugbu a na ị na-enyochakwa isi echiche na echiche ndị dị mkpa, ọ bụ oge iji nwalee ihe ị ma. Ngwa a na-enye ụdị ajụjụ ọmụmụ dị iche iche emebere iji kwado nghọta gị wee nyere gị aka ịmata otú ị ghọtara ihe ndị a kụziri.
Ị ga-ahụ ngwakọta nke ụdị ajụjụ dị iche iche, gụnyere ajụjụ chọrọ ịhọrọ otu n’ime ọtụtụ azịza, ajụjụ chọrọ mkpirisi azịza, na ajụjụ ede ede. A na-arụpụta ajụjụ ọ bụla nke ọma iji nwalee akụkụ dị iche iche nke ihe ọmụma gị na nkà nke ịtụgharị uche.
Jiri akụkụ a nke nyocha ka ohere iji kụziere ihe ị matara banyere isiokwu ahụ ma chọpụta ebe ọ bụla ị nwere ike ịchọ ọmụmụ ihe ọzọ. Ekwela ka nsogbu ọ bụla ị na-eche ihu mee ka ị daa mba; kama, lee ha anya dị ka ohere maka ịzụlite onwe gị na imeziwanye.
- What is the unit of the moment of a force? A. newton B. newton metre C. newton per metre D. metre Answer: B
- A force of 25 N acts at a perpendicular distance of 0.40 m from a pivot. What is the moment of the force about the pivot? A. 0.016 N m B. 10 N m C. 25.4 N m D. 62.5 N m Answer: B
- A beam is pivoted at its centre. A force of 60 N acts 0.50 m to the left of the pivot. A force F acts 0.25 m to the right of the pivot and the beam is balanced. What is F? A. 30 N B. 60 N C. 120 N D. 240 N Answer: C
- An object standing on a flat surface will topple when A. its weight is greater than the contact force from the surface B. the line of action of its weight lies outside its base C. its centre of mass is above the middle of its base D. the clockwise and anticlockwise moments about its edge are equal Answer: B
- A crowbar allows a small effort to move a much larger load. This is because a simple lever acts as a A. distance multiplier B. energy multiplier C. force multiplier D. speed multiplier Answer: C
Rue ajuju ndi a n'ime ngwa ahu
Rue ajuju ndi a n'ime ngwa ahu
Akwụkwọ A Na-atụ Aro
Meecha Ajụjụ Ule Ọmarịcha
Ị chọrọ ime ajụjụ ule ọmarịcha gbasara Moments And Levers P? Budata ngwa Green Bridge CBT iji nweta ajụjụ ule ọmarịcha na nyocha zuru ezu gbasara isiokwu a.
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