Question

1. Define thrust and pressure
2. Name the two factors affecting the pressure
3. Give two examples for the way of decreasing Pressure
4. What is fluid?
5. Draw and explain the pressure exerted by a liquid column
6. State the 5 laws of liquid pressure
7. Define Pascal's law
8. What is the principle of hydraulic machines
9. Why the wall of a dam is thicker at the bottom?

Answer 1

Answer:

1. The force acting on an object perpendicular to the surface is called thrust. Thrust per unit Area is called Pressure

2. An increase in the number of gas molecules in the same volume container increases pressure. A decrease in container volume increases gas pressure. An increase in temperature of a gas in a rigid container increases the pressure.

3. Some of the examples I can think of are:

• The straps of a bag. They are made wide to put less pressure on your shoulders .
• The foundation of buildings are made wide.
• Tanks have caterpillar tracks which increases the surface area to decrease pressure. Or otherwise, they would sink in the sand due to their own weight.

4. In physics, a fluid is a liquid, gas, or other material that continually deforms under an applied shear stress, or external force. They have zero shear modulus, or, in simpler terms, are substances which cannot resist any shear force applied to them.

5. The pressure exerted by a column of liquid of height h and density ρ is given by the hydrostatic pressure equation p = ρgh, where g is the gravitational acceleration.

6. Liquid exerts pressure on the wall of container. Pressure force increases as the depth of liquid increases. Pressure force will be same at all points inside the liquid at equal depth

7. Pascal's law says that pressure applied to an enclosed fluid will be transmitted without a change in magnitude to every point of the fluid and to the walls of the container. The pressure at any point in the fluid is equal in all directions.

8. A hydraulic press works on the principle of Pascal's law, which states that when pressure is applied to a confined fluid, the pressure change occurs throughout the entire fluid. Within the hydraulic press, there is a piston that works as a pump, that provides a modest mechanical force to a small area of the sample.

9. The pressure applied to walls of the dam will be a function of the amount of water that is over that particular point on the wall. So water pressure is very large at the bottom due to its large depth. That's why dams are constructed thicker at their bottoms than at their tops.

All Answers Given :)

You are Napinder or Sanu ? xD

Answer 2

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Ans.1. The force acting on an object perpendicular to the surface is called thrust. Thrust per unit Area is called Pressure.

Ans.2. The two factors affecting the pressure are:-

• An increase in the number of gas molecules in the same volume container increases pressure.

• A decrease in container volume increases gas pressure.

Ans.3. The two examples are:-

• The straps of a bag. They are made wide to put less pressure on your shoulders .

• The foundation of buildings are made wide.

Ans.4 Fluid, any liquid or gas or generally any material that cannot sustain a tangential, or shearing, force when at rest and that undergoes a continuous change in shape when subjected to such a stress.

Ans.7. Pascal's law says that pressure applied to an enclosed fluid will be transmitted without a change in magnitude to every point of the fluid and to the walls of the container. The pressure at any point in the fluid is equal in all directions