Question

Class - 8th
Topic - Force and Pressure
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1. What is the relation between pressure, force and area? State the units in which pressure, force and area are measured.

2. Explain why, school bags are provided with wide straps to carry them.

Answer 1

1. What is the relation between pressure, force and area? State the units in which pressure, force and area are measured.

• The relation between pressure force and area is,

• $\sf Pressure \: = \: \dfrac{Force}{Area}$

• Unit of Pressure - Pascal (Pa)

• Unit of Force - Newton (N)

• Unit of Area - square metre (m²)

2. Explain why, school bags are provided with wide straps to carry them.

• We know that,

• $\sf Force \: \propto \: \dfrac{1}{Area}$

• This implies that when Area increases force decreases in the same way when area decreases force increases.

• That is the reason why School bags are provided with wide straps to reduce weight/force on our shoulders.

Answer 2

Question : ⠀⠀

⠀⠀⠀ 1). What is the relation between pressure, force and area ? State the units in which

⠀⠀⠀⠀⠀pressure, force and area are measured .⠀

⠀⠀⠀⠀⠀Ans : The relationship between Pressure , Force and Area is as follows :

$\qquad \dag\:\:\bigg\lgroup \sf{ Pressure = \dfrac{ Force}{Area}}\bigg\rgroup$

⠀⠀⠀⠀⠀Pressure : Pressure is the amount of force applied to the surface of objects [ per unit area ] .

⠀⠀⠀⠀⠀▪︎ Unit of Pressure : Pascal [ Pa ]

⠀⠀⠀⠀⠀▪︎ Unit of Force : Newton [ N ]

⠀⠀⠀⠀⠀▪︎ Unit of Area : square metre [ m² ]

⠀⠀ 2). Explain why, school bags are provided with wide straps to carry them .

$\dag\:\:\sf{ As,\:We\:know\:that\::}$

$\qquad \dag\:\:\bigg\lgroup \sf{ Pressure = \dfrac{ Force}{Area}}\bigg\rgroup$

Therefore,

$\qquad:\implies \sf Pressure = \dfrac{ Force}{Area}$

From this ,⠀

⠀⠀⠀⠀⠀We can clearly say that :

$\qquad:\implies \sf Force \propto \dfrac{ 1}{Area}$

$\qquad \dag\:\:\bigg\lgroup \sf{ Force \propto \dfrac{ 1}{Area} }\bigg\rgroup$

⠀⠀⠀⠀⠀This Equation says that when Area increases then force decreases and in

⠀⠀⠀⠀⠀the vice - versa of that when area decrease then force increases .⠀⠀

⠀⠀⠀

⠀⠀⠀Ans : School bags are provided with wide straps because when we carry them on

⠀⠀⠀⠀⠀our shoulders when they ⠀have wide straps then strap will cover larger area

⠀⠀⠀⠀⠀and less force will be exerted on our shoulders. So to reduce force on our

⠀⠀⠀⠀⠀shoulders School bags are provided with wider straps .

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