# Pressure Numericals class 9

Last updated on June 25th, 2023 at 01:53 pm

In this post, you will find a set of **Pressure Numericals for class 9**, where we have solved selected practice problems based on the *Pressure formula* (in terms of thrust or perpendicular force). As a reference, we have added the definition, formula, and SI unit of pressure.

**Formula Used**

Pressure can be calculated from this formula or Pressure equation**Pressure = perpendicular Force /Area = thrust / areaP = F/A**

**Pressure Numericals for class 9** [with solutions]

1 ] A water glass sitting on a table weighs 4 N. The bottom of the water glass has a surface area of 0.003 m^2. Calculate the pressure the water glass exerts on the table.

**solution**:

Force or thrust here =F= 4 N

Area A = 0.003 m^2

Pressure exerted = P = F/A = 4/0.003 Pa = 1333.33 Pa

2] A student weighs 600 N. The student’s shoes are in contact with the floor over a surface area of 0.012 m^2. Calculate the pressure exerted by the student on the floor.

**solution: **

Force or thrust here =F=600 N

Area A = 0.012 m^2

Pressure exerted = P = F/A = 600/0.012 Pa = 5 x 10^4 Pa

3] A box that weighs 250 N is at rest on the floor. If the pressure exerted by the box on the floor is 25,000 Pa, over what area is the box in contact with the floor?

**solution**:

Force or thrust here =F=250 N

Pressure exerted = P = 25,000 Pa

So the Area in contact A =F/P= 250/25000 m^2 = 0.01 m^2

4] If You are holding a 2-kg book in the palm of your hand and if the area of contact between your hand and the book is 0.003 m^2 then find out the pressure that is exerted on your hand by the book.

**Solution:**Force = F = 2 x 9.8 N = 19.6 N

Area = 0.003 m^2

Pressure = F/A = 19.6/0.003 Pa =6533.33 Pa

**Pressure definition**

**The pressure is the force per unit area that is applied on the surface of an object.** Pressure increases if the force applied increases, and decreases if the area of contact increases.

**Pressure Unit in SI**

The unit of pressure in the SI system is the Pascal, abbreviated Pa. One pascal is equal to a force of 1 N applied over an area of 1 m^2, or 1 Pa = 1 N/m^2.