Difference between Thrust and Pressure? | Physics | Don't Memorise
TLDRThe video script discusses the concept of thrust and pressure in everyday scenarios, using relatable examples like pushing a box and hammering a nail. It explains that thrust, the force acting perpendicular to a surface, is measured in Newtons. The script further delves into pressure, defined as the force per unit area, and illustrates this with the example of a pencil between fingers and standing versus lying on sand. The concept is clarified by the inverse relationship between pressure and area, with the SI unit of pressure identified as Pascal, named after the scientist Blaise Pascal.
Takeaways
- 📦 Thrust is the force acting perpendicular to a surface, such as pushing a box or hammering a nail.
- 🔽 The SI unit of thrust is the Newton, which is the same as the unit for force.
- 🤔 Pressure is the concept of force per unit area, and it can be understood through everyday examples like holding a pencil.
- 👁️ The depression observed in fingers when holding a pencil indicates that pressure is higher on the index finger due to a smaller contact area.
- 👣 When standing on loose sand versus lying down, the difference in depth is due to the change in the area over which your body's weight is distributed, affecting pressure.
- ∝ Pressure is inversely proportional to the area over which the thrust is applied; smaller area results in greater pressure.
- 📚 Newton's third law is implied in the pencil example, where the pencil exerts an equal and opposite force on the fingers.
- 📌 The SI unit of pressure is Pascal, which is one Newton per meter squared, named after the scientist Blaise Pascal.
- 🔄 The concepts of thrust and pressure help explain the effects of force on different surfaces and in various scenarios.
- 📈 Understanding pressure is crucial in many scientific and engineering applications, where the effects of force distribution are critical.
Q & A
What is the special name given to a force acting perpendicular to the surface?
-The force acting perpendicular to the surface is called Thrust.
What is the SI unit of thrust?
-The SI unit of thrust is the Newton, which is the same as the unit for force.
How is pressure defined in terms of thrust?
-Pressure is defined as the thrust (force) per unit area.
What happens when you apply equal force on both ends of a pencil held between your thumb and index finger?
-A depression forms on both fingers, with the index finger showing a more significant depression due to the smaller area experiencing the force, resulting in higher pressure.
Why does standing on loose sand cause your feet to sink more than lying down on the sand?
-When standing, the area exerting force (feet) is smaller compared to the area when lying down (entire body), resulting in higher pressure and thus feet sinking more.
What is the SI unit of pressure and how is it named?
-The SI unit of pressure is the Pascal, which is named after the scientist Blaise Pascal. It is equivalent to one Newton per square meter.
How does the concept of pressure explain the difference in depression observed on the fingers when holding a pencil?
-The depression is more significant on the finger with the smaller contact area (index finger) because pressure is higher when the same force is applied over a smaller area.
What is Newton's third law and how does it relate to the pencil example?
-Newton's third law states that for every action, there is an equal and opposite reaction. In the pencil example, the pencil applies an equal and opposite force on the fingers, causing the depressions.
What is the relationship between the area of application and the resulting pressure?
-Pressure is inversely proportional to the area over which the thrust is applied. A smaller area results in higher pressure, and a larger area results in lower pressure if the thrust remains constant.
How does understanding pressure help in real-life situations?
-Understanding pressure helps in various applications, such as engineering, where the design of structures must account for the pressure exerted on different surfaces to ensure stability and safety.
What is the significance of Pascal's contributions to the field of pressure studies?
-Blaise Pascal was a renowned scientist who conducted extensive studies on fluid mechanics and pressure, leading to the definition of pressure in terms of Pascal, which is now a fundamental unit in physics and engineering.
Outlines
🚀 Understanding Thrust and Pressure
This paragraph introduces the concept of thrust as the force acting perpendicular to a surface, equivalent to the force itself, with the SI unit being Newton. It then delves into the concept of pressure, explaining it as the force per unit area. The paragraph uses everyday examples, such as a pencil between fingers and standing on sand, to illustrate how pressure varies with the area over which the force is applied. The SI unit of pressure is defined as Pascal, which is one Newton per square meter, named after the scientist Blaise Pascal. The summary emphasizes the relationship between thrust, pressure, and the area over which these forces are exerted.
Mindmap
Keywords
💡Force
💡Thrust
💡SI Unit
💡Pressure
💡Unit Area
💡Newton's Third Law
💡Pascal
💡Perpendicular
💡Inverted Proportion
💡Blaise Pascal
💡Conceptual Understanding
Highlights
Forces in daily life often act perpendicular to surfaces, such as pushing a box or hammering a nail.
The special name for a force exerted perpendicular to a surface is 'Thrust'.
The SI unit of thrust is the Newton, which is the same as the unit for force.
Pressure is the force per unit area, and in the context of thrust, it would be thrust per unit area.
Pressure is inversely proportional to the area over which the force is applied.
A smaller area under the same thrust results in greater pressure, as observed with the pencil example.
When standing on loose sand, the smaller area of the feet results in greater pressure compared to lying down, where the body's area in contact is larger.
The SI unit of pressure is the Pascal, which is equivalent to one Newton per square meter.
Blaise Pascal, after whom Pascal is named, conducted extensive studies in the field of pressure.
Thrust is defined as the total force acting perpendicular to the surface.
Pressure can be understood as the effect of thrust applied over a certain area.
The concept of pressure explains why a smaller area under force results in a more noticeable effect, such as a deeper depression.
Understanding pressure allows for the analysis of real-world situations like the depth of footprints in sand.
The principles of thrust and pressure are fundamental in the study of mechanics and have practical applications in engineering and physics.
The relationship between thrust, pressure, and area is a key concept in understanding how forces interact with surfaces.
The discussion of thrust and pressure provides a clear understanding of how these physical quantities relate to everyday experiences.
The use of simple, relatable examples, like the pencil and sand, helps to clarify abstract physical concepts.
The transcript effectively communicates the concepts of thrust and pressure through a combination of definitions, examples, and real-world applications.
Transcripts
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