Science - Combined - 0653 CIE

Pressure

Bayani Gaba-gaba

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.

Manufura

[Core] Describe how pressure varies with force and area in the context of everyday examples
[Core] Define pressure as force per unit area; recall and use the equation F p = A

Takardar Darasi

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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Nazarin Darasi

Barka da kammala darasi akan Pressure. Yanzu da kuka bincika mahimman raayoyi da raayoyi, lokaci yayi da zaku gwada ilimin ku. Wannan sashe yana ba da ayyuka iri-iri Tambayoyin da aka tsara don ƙarfafa fahimtar ku da kuma taimaka muku auna fahimtar ku game da kayan.

Za ka gamu da haɗe-haɗen nau'ikan tambayoyi, ciki har da tambayoyin zaɓi da yawa, tambayoyin gajeren amsa, da tambayoyin rubutu. Kowace tambaya an ƙirƙira ta da kyau don auna fannoni daban-daban na iliminka da ƙwarewar tunani mai zurfi.

Yi wannan ɓangaren na kimantawa a matsayin wata dama don ƙarfafa fahimtarka kan batun kuma don gano duk wani yanki da kake buƙatar ƙarin karatu. Kada ka yanke ƙauna da duk wani ƙalubale da ka fuskanta; maimakon haka, ka kallesu a matsayin damar haɓaka da ingantawa.

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