Question

4. The surface area of an object is 20 m² and a force of 10 N is applied on it, then what is the pressure? (AS) 5. How do you appreciate the role of friction in facilitating​

Answer 1

Answer:

the pressure is 0.5 N/m² or Pascal

Explanation:

Given :-

The surface area of an object = 20 m²

Force applied on object, F = 10 Newton

To Find :-

Pressure = ??

Formula to be used :-

Pressure = Force/Area

Solution :-

Putting all the values, we get

⇒ Pressure = Force/Area

⇒ Pressure = ( 10/20) N/m²

⇒ Pressure = 0.5 N/m² or Pascal

Hence, the pressure is 0.5 N/m² or Pascal.

Answer 2

Explanation:

We have,

• Surface area of the object (A) = 20 m²
• Force applied (F) = 10 N

To calculate : Pressure.

Pressure is defined as force per unit area. Henceforth,

⇒ Pressure = Force/Area

⇒ P = 10 N ÷ 20 m²

⇒ P = 0.5 N/m²

⇒ P = 0.5 Pa

Therefore, pressure exerted is 0.5 Pa.

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The role of friction in facilitating :

• Friction helps in walking : It is friction which helps us to walk else we would fall. When we walk, there is friction between our foot and the ground. And this thing prevents us from slipping.

• Friction produces heat : The production of heat with the help of friction helps to light matchsticks. Matchstick lights up due to the friction against the sode of the matchbox when we strike it.

• Friction helps us in writing : If there were no friction, we wouldn't be able to hold a pen vertically. It is friction that opposes slipping and helps us to hold the pen.