Question

explain pressure exerted by solid with activity
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Answer 1

Answer:

A solid exerts pressure only on its base downwards i.e. a solid will exert pressure in the direction of its weight which is downward.

while a fluid exerts pressure at all points in all directions .

Answer 2

Answer:

HERE IS AN ACTIVITY-

Our Objective

To observe and compare the pressure exerted by a solid iron cuboid on sand while resting on its three different faces and to calculate the pressure exerted in the three cases.  

The Theory-

To study and compare the pressure exerted by a solid iron cuboid on sand, we need to find its mass and weight.

Can you define the Mass of an object?

The mass of an object is a fundamental property of the object; a numerical measure of its inertia; a fundamental measure of the amount of matter in the object. The usual symbol for mass is 'm' and its SI unit is kilogram.

In everyday usage, mass is often referred to as weight, the units of which are often taken to be kilograms. In scientific use, weight is the gravitational force acting on a given body, while mass is an intrinsic property of this body.

On the surface of the Earth, the weight W of an object is related to its mass m by W = m.

W = F, thus:

Here ‘g’ is the Earth's gravitational field strength, equal to about 9.81 m s−2.

An object's weight depends on its environment, while its mass does not. The SI unit of weight is the same as that of force, that is, Newton (N).The force acting on an object perpendicular to the surface is called thrust. The effect of thrust depends on the area on which it acts. Thus:

MORE INFO-

The thrust on unit area is called pressure. Thus:

The thrust on unit area is called pressure. Thus:-SI unit of pressure is N/m2 or Nm-2 (Newton per square metre).

In honour of scientistBlaise Pascal, the SI unit of pressure is called pascal, denoted by Pa.

Explanation:

LEARNING OUTCOME-

• The depression in sand is greater when the solid iron cuboid is placed on its least surface area.
• The pressure exerted by the smallest surface area is greater than the other surfaces with larger areas.
• Thus, the students understood the theories of force, area pressure, depression and their dependence on each other

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