Match the following:Technology Scientific Principles (a) Aeroplane 1. Newton's Law (b) Air Balloon 2. Bernoulli's Principle (c) Rocket 3. Law of thermodynamics (d) Steam Engine 4. Buoyant Force
| Technology | Scientific Principles | ||
|---|---|---|---|
| (a) | Aeroplane | 1. | Newton's Law |
| (b) | Air Balloon | 2. | Bernoulli's Principle |
| (c) | Rocket | 3. | Law of thermodynamics |
| (d) | Steam Engine | 4. | Buoyant Force |
- A(a) - 1, (b) - 3, (c) - 2, (d) - 4
- B(a) - 3, (b) - 1, (c) - 4, (d) - 2
- C(a) - 4, (b) - 2, (c) - 3, (d) - 1
- D(a) - 2, (b) - 4, (c) - 1, (d) - 3
Solution & Step-by-step Explanation
This question asks us to match various technologies with the fundamental scientific principles that explain their operation. Let's analyze each pair to find the correct connections.
Aeroplane: Bernoulli's Principle
An aeroplane generates lift primarily due to the shape of its wings, known as airfoils. The design of an airfoil causes air to flow faster over the curved upper surface than over the flatter lower surface. According to Bernoulli's Principle, an increase in the speed of a fluid (like air) occurs simultaneously with a decrease in its pressure. Therefore, the faster-moving air above the wing has lower pressure, while the slower-moving air below the wing has higher pressure. This pressure difference creates an upward force called lift, which allows the aeroplane to fly.
- Faster air flow over the top → Lower pressure.
- Slower air flow under the bottom → Higher pressure.
- Pressure difference creates lift.
Air Balloon: Buoyant Force
An air balloon, specifically a hot air balloon, operates based on the principle of buoyancy, which is described by Archimedes' Principle. Buoyancy is an upward force exerted by a fluid that opposes the weight of an immersed object. For an air balloon, the air inside the balloon is heated, making it less dense than the cooler air outside. Because the hot air inside is lighter than the equivalent volume of cool air it displaces, the balloon experiences an upward buoyant force greater than its own weight, causing it to float and rise.
- Hot air is less dense than surrounding cold air.
- Displaces heavier cold air.
- Upward buoyant force lifts the balloon.
Rocket: Newton's Law
The propulsion of a rocket is a classic example of Newton's Third Law of Motion, which states that for every action, there is an equal and opposite reaction. A rocket expels hot gases downwards at very high speeds (action). In response, the gases exert an equal and opposite force upwards on the rocket (reaction), propelling it into the air. This principle is also related to the conservation of momentum, where the backward momentum of the ejected gases results in forward momentum for the rocket.
- Rocket expels hot gases (action).
- Gases push rocket upwards (reaction).
- Direct application of Newton's Third Law.
Steam Engine: Laws of Thermodynamics
A steam engine is a heat engine that performs mechanical work using steam as its working fluid. Its operation is governed by the Laws of Thermodynamics. Specifically, the First Law of Thermodynamics (conservation of energy) explains how heat energy supplied to the engine is converted into internal energy of the steam and mechanical work. The Second Law of Thermodynamics dictates the efficiency of this conversion, stating that it's impossible to convert all heat energy into work, as some energy will always be lost as waste heat due to entropy.
- Converts heat energy (from steam) into mechanical work.
- Relies on energy conversion and efficiency principles.
- Governed by the First and Second Laws of Thermodynamics.
Matching Summary
Based on the explanations above, we can establish the following matches:
Therefore, the correct combination is (a) - 2, (b) - 4, (c) - 1, (d) - 3.
Aeroplane: Bernoulli's Principle
An aeroplane generates lift primarily due to the shape of its wings, known as airfoils. The design of an airfoil causes air to flow faster over the curved upper surface than over the flatter lower surface. According to Bernoulli's Principle, an increase in the speed of a fluid (like air) occurs simultaneously with a decrease in its pressure. Therefore, the faster-moving air above the wing has lower pressure, while the slower-moving air below the wing has higher pressure. This pressure difference creates an upward force called lift, which allows the aeroplane to fly.
- Faster air flow over the top → Lower pressure.
- Slower air flow under the bottom → Higher pressure.
- Pressure difference creates lift.
Air Balloon: Buoyant Force
An air balloon, specifically a hot air balloon, operates based on the principle of buoyancy, which is described by Archimedes' Principle. Buoyancy is an upward force exerted by a fluid that opposes the weight of an immersed object. For an air balloon, the air inside the balloon is heated, making it less dense than the cooler air outside. Because the hot air inside is lighter than the equivalent volume of cool air it displaces, the balloon experiences an upward buoyant force greater than its own weight, causing it to float and rise.
- Hot air is less dense than surrounding cold air.
- Displaces heavier cold air.
- Upward buoyant force lifts the balloon.
Rocket: Newton's Law
The propulsion of a rocket is a classic example of Newton's Third Law of Motion, which states that for every action, there is an equal and opposite reaction. A rocket expels hot gases downwards at very high speeds (action). In response, the gases exert an equal and opposite force upwards on the rocket (reaction), propelling it into the air. This principle is also related to the conservation of momentum, where the backward momentum of the ejected gases results in forward momentum for the rocket.
- Rocket expels hot gases (action).
- Gases push rocket upwards (reaction).
- Direct application of Newton's Third Law.
Steam Engine: Laws of Thermodynamics
A steam engine is a heat engine that performs mechanical work using steam as its working fluid. Its operation is governed by the Laws of Thermodynamics. Specifically, the First Law of Thermodynamics (conservation of energy) explains how heat energy supplied to the engine is converted into internal energy of the steam and mechanical work. The Second Law of Thermodynamics dictates the efficiency of this conversion, stating that it's impossible to convert all heat energy into work, as some energy will always be lost as waste heat due to entropy.
- Converts heat energy (from steam) into mechanical work.
- Relies on energy conversion and efficiency principles.
- Governed by the First and Second Laws of Thermodynamics.
Matching Summary
Based on the explanations above, we can establish the following matches:
| Technology | Scientific Principle |
|---|---|
| (a) Aeroplane | 2. Bernoulli's Principle |
| (b) Air Balloon | 4. Buoyant Force |
| (c) Rocket | 1. Newton's Law |
| (d) Steam Engine | 3. Law of thermodynamics |