Thrust and pressure class 9

The Concept of Pressure What is Pressure? Have you ever wondered why our knives need to be so sharp or why the nails we use the end with a sharp point? The answers to all these questions lie in the concept of pressure. It is the ratio of the force applied to the surface area over which the force is applied. We can define pressure as: The force applied perpendicular to the surface of an object per unit area over which that force is distributed. Formula: When a force of ‘F’ Newton is applied perpendicularly to a surface area ‘A’, then the pressure exerted on the surface by the force is equal to the ratio of F to A. The formula for pressure (P) is: P = F / A Units of Pressure There are various units to describe Pressure some of which we will discuss further in this article. The SI pascal (Pa). A pascal can be defined as a force of one newton applied over a surface area of a one-meter square. You may also want to check out these topics given below! • • • • • Factors Affecting Pressure Since the pressure is dependent on the area over which the force is acting, the pressure can be increased and decreased without any change in the force. The force applied to be constant if the surface becomes smaller the pressure increases and vice versa. For example, a brick sitting on a surface exerts a force equal to its weight on the object it is resting on. Now we know that a rectangular brick has a wide surface and a thin surface on the sides. By changing the orientation of the bric...

Thrust and Pressure Have you ever wondered why a camel can run in a desert easily? Why an army tank weighing more than a thousand tonne rests upon a continuous chain? Why a truck or a motorbus has much wider tyres? Why cutting tools have sharp edges? In order to address these questions and understand the phenomena involved, it helps to introduce the concepts of the net force in a particular direction (thrust) and the force per unit area (pressure) acting on the object concerned. Let us try to understand the meanings of thrust and pressure by considering the following situations: Situation 1 : You stand on loose sand. Your feet go deep into the sand. Now, lie down on the sand. You will find that your body will not go that deep in the sand. In both cases the force exerted on the sand is the weight of your body. You have learnt that weight is the force acting vertically downwards. Here the force is acting perpendicular to the surface of the sand. The force acting on an object perpendicular to the surface is called thrust. When you stand on loose sand, the force, that is, the weight of your body is acting on an area equal to area of your feet. When you lie down, the same force acts on an area equal to the contact area of your whole body, which is larger than the area of your feet. Thus, the effects of forces of the same magnitude on different areas are different. In the above cases, thrust is the same. But effects are different. Therefore the effect of thrust depends on the ar...

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Table of Contents • • • • • What is the difference between thrust and pressure class 9? (1) Force acting perpendicular to the surface of an object is known as Thrust. (1) Thrust acting per unit area is known as pressure. The S.I. If a thrust of magnitude 200N is applied on a surface of an object having area 20m2, it creates the pressure of 10pa . What is thrust and pressure? Thrust is the pressure exerted on the surface of the wooden block in a direction perpendicular to it, while pressure is a continuous force that is applied to the object against a body in contact with it. So, thrust is a force exerting on the object and the pressure is the force acting on the object per unit area. What is the relationship between thrust and pressure? Q18) How is thrust related to pressure? Solution: Pressure is per unit thrust on a surface, hence pressure is directly proportional to thrust. Greater the thrust, greater is the pressure and smaller the thrust, smaller is the pressure. What is the symbol of thrust? Thrust is a reaction force described quantitatively by Newton’s third law. Force, and thus thrust, is measured using the International System of Units (SI) in newtons (symbol: N), and represents the amount needed to accelerate 1 kilogram of mass at the rate of 1 meter per second per second. What is thrust with example? Thrust is defined as to quickly push with force. An example of thrust is to move forward as a crowd entering a stadium. The definition of a thrust is the act of pu...

Thrust can be in any direction, just that it is perpendicular to the surface it is applied on. I think your teacher's explanation isn't a proper and correct way to explain stuff. Solids at rest are only pulled by gravity, hence their thrust is downwards. However, fluids (i.e. liquids and gases) apart from being pulled by gravity, also exert thrust of the walls of their container due to their ability to flow. This thrust is exerted on all walls irrespective of the wall being upwards or downwards or sidewards. (in case of liquid, it is not exerted on the upward wall because liquid particles don't have enough kinetic energy to jump up against gravity. However, the liquid will exert upward thrust if something is immersed in it i.e. buoyant force) Hope that helped. Feel free to comment if you need further help :) - [Instructor] Have you seen these people who sleep on a bed full of nails? And to make things more dramatic will have an assistant to hammer on them? Why doesn't it hurt? Or have you wondered why military tanks have these chains? Why don't they just have wheels like any other normal vehicles? Now, these two things might seem unrelated, but they can be answered by using one single concept of pressure. And so in this video, let's explore what pressure is. To understand pressure let's ask some more questions, but this time a little day-to-day life. For example, when you hammer onto a nail, then it can puncture this wooden board, right? But what if you were to keep the na...