Tag: pressure on surface

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

Which of the following are units used to measure pressure?

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

  2. pascal (Pa)
  3. newton per ${m}^{2}$

  4. joules
Reveal answer Fill a bubble to check yourself
B,C Correct answer
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. 

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

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?

  1. The one with pointed heels

  2. The one with flat soles

  3. Both will feel similar comfort

  4. Can't say
Reveal answer Fill a bubble to check yourself
B Correct answer
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.