Physics (9-1) - 0972 CIE

Pressure

Gbogbo ọrọ náà

A sharp knife slices easily while a blunt one tears, a camel crosses soft sand on its broad feet, and a deep-sea diver feels the water squeeze harder the deeper they go. All three are about pressure: how a force is shared over an area, and how a liquid presses on whatever is beneath its surface.

In this topic you will define pressure, use the equation linking force and area, and explain everyday examples where changing the area changes the effect of a force. You will then look beneath a liquid surface, see qualitatively how pressure grows with depth and density, and use the Supplement equation for the change in pressure in a liquid.

Ebumnobi

Define pressure as force per unit area; recall and use the equation F p = A
Describe how pressure varies with force and area in the context of everyday examples
Describe, qualitatively, how the pressure beneath the surface of a liquid changes with depth and density of the liquid
[Supplement] Recall and use the equation for the change in pressure beneath the surface of a liquid ∆p = ρg∆h

Akọmọ Ojú-ẹkọ

Pressure decides whether a tool cuts or a tractor sinks, and it sets the loads on dam walls and submarine hulls. In the exam you must define pressure, apply \( p = F/A \) with correct units, and use the liquid pressure equation, so the calculations here earn direct marks.

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Ayẹwo Ẹkọ

Ekele diri gi maka imecha ihe karịrị na Pressure. 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.

A force of 40 N acts on an area of 0.5 m^2. The pressure is: A. 20 Pa B. 80 Pa C. 0.0125 Pa D. 40 Pa Answer: B
The SI unit of pressure is the: A. newton B. joule C. pascal D. watt Answer: C
Pressure beneath a liquid surface increases with: A. depth and density B. width of container only C. surface area only D. colour of the liquid Answer: A
A diver is 10 m deep in water of density 1000 kg/m^3 (g = 9.8 N/kg). The increase in pressure is: A. 980 Pa B. 9800 Pa C. 98000 Pa D. 100 Pa Answer: C
Why does a sharp knife cut more easily than a blunt one? A. it has more mass B. its small edge area gives higher pressure C. it is heavier D. it has lower density Answer: B