Tag: pressure on surface

Questions Related to pressure on surface

Which of the following are units used to measure pressure?

physics pressure in liquids and gases pressure dependence on force and area concept of pressure pressure on surface

  1. $kg$ ${m}^{-2}$

  2. pascal (Pa)

  3. newton per ${m}^{2}$

  4. joules

Show answer
Correct Option: B,C
Explanation:

The pressure is the force per unit area. So, $P=F/A$

The unit of force is newton (N) and unit of area is $m^2$. 
Thus, the unit of pressure is $N/m^2$. 
Pascal is the SI unit of pressure. It is equal to one newton divided by one square meter. 

The SI unit of pressure is $N/m^2$.This unit is otherwise called ____________.

physics pressure in liquids and gases pressure dependence on force and area concept of pressure pressure on surface

  1. Pascal

  2. Newton

  3. Joule

  4. None of these

Show answer
Correct Option: A
Explanation:

Pressure is defined as force applied per unit area. Hence, its SI unit is $N/{ m }^{ 2 }$ or Pascal here,

         1 Pascal = 1 $N/{ m }^{ 2 }$.

Two women are of the same weight. One wears sandals with pointed heels while the other wears sandals with flat soles. Which one would feel more comfortable while walking on a sandy beach?

physics pressure in liquids and gases pressure dependence on force and area concept of pressure pressure on surface

  1. The one with pointed heels

  2. The one with flat soles

  3. Both will feel similar comfort

  4. Can't say

Show answer
Correct Option: B
Explanation:

Pressure(P)$=$$ \frac{Force(F)}{Area(A)}$

As both the women have same weight, so both of them will apply the same force on the ground. But flat soles having larger area compared to sandals with pointed heels, will exert lesser pressure compared to that of sandals having pointed heels. So, the sandals with pointed heels will sink more. Therefore, the woman having flat sole sandal will feel more comfortable while walking on a sandy beach.